Identify the steps needed to configure a switch for SSH the answer order does not matter

Just like riding a bicycle, nobody's born knowing how to setup a network switch. And this process is a little more advanced than, say, setting up your home Internet or even a plug-and-play type switch. But, with the right guidance, a can-do attitude, and a dash of bravery, even newbie IT professionals can integrate a new Cisco switch into their business environment. As your virtual training wheels, we've broken down the task into its simplest parts so you can successfully create client VLANS, build DHCP systems, and assign access ports without skinning your knees.

Check the model number of your shiny new switch. Or, if you are using a spare, check the device hardware and its connected cables for any damages. If everything checks out, power on the switch and verify that all the indicator lights are in working order. Next, use a rollover cable to console into the switch from your computer. To do this, you will need to download and install Putty (or a similar, fun-named software tool). Run Putty and select the 9600 speed serial connection. You are now connected to the switch and ready to check the output of the following commands:

• show version
• show running-config
• show VLAN brief
• show VTP status
  • (config)# IP domain-name routerfreak.com
  • (config)# hostname Switch01
  • (config)# interface VLAN1
  • (config)# description Management VLAN
  • (config)# IP address 192.168.101.1 255.255.255.0
  • vtp [client | server | transparent]
  • vtp domain name
  • description *** DESCRIPTION ***
  • switchport access vlan ###
  • sswitchport mode access
  • power inline consumption ###
  • queue-set 2
  • mls qos trust dscp
  • storm-control multicast level 50.00
  • no cdp enable
  • spanning-tree portfast
  • spanning-tree bpduguard enable
  • Interface GigabitEthernet1/0/1
  • description *** UPLINK ***
  • switchport trunk encapsulation dot1q
  • switchport mode trunk
  • speed 1000
  • duplex full
  • Switch01(config)# crypto key generate rsa
  • The name for the keys will be:
  • Switch01.routerfreak.com
  • How many bits in the modulus [512]: 1024
  • % Generating 1024 bit RSA keys, keys will be non-exportable...[OK]
  • # line vty 0 4
  • (config-line)# transport input ssh
  • (config-line)# login local
  • (config-line)# password routerfreak
  • (config-line)# exit
  • # line console 0
  • (config-line)# logging synchronous
  • (config-line)# login local
  • Switch01# service password-encryption
  • remote-computer# ssh 192.168..101.1
  • Log in as: username
  • Password:
  • Switch01>en
  • Password:
  • Switch01#

For spare switches, make sure to delete the flash:vlan.dat file to erase the previous configuration.

Step 2: Set up management IP

Unlike with that punny name you gave your home Wi-Fi network, when setting up the hostname for your switch you should probably stick to a more professional and standard naming convention. Follow any preset naming assignment your company is using and then assign an IP address on the management VLAN. Next, make sure your switch has a set hostname and domain name:

Step 3: Check VTP revision number

Hit the show vtp status command to reveal your Virtual Trunking Protocol (VTP) revision numbers. The VTP revision numbers determine which updates are to be used in a VTP domain. When you set a VTP domain name, the revision number is set to zero—after which each change to the VLAN database increases the revision number by one. Your switch will only process data from a neighboring switch coming from the same domain and if the revision number of the neighboring switch is higher than its own. This means that the switches will update their VLAN configuration based on the VTP information being sent by the switch with the highest revision number.

So, before you add your switch to the network, you’re going to want to set its revision number to zero. To easily reset the domain back to zero, change the config mode to transparent:

Step 4: Configure access ports

You might already have a template ready for access port configuration, but in case you don’t, here are some commands you should use:

Step 5: Configure trunk ports

Enter the command sh int g0/1 capabilities and check the trunking protocol supported. If ISL is supported, you have to issue the switchport trunk encapsulation dot1q on the trunk port configuration. If not, simply type switchport mode trunk. It means there is no other encapsulation supported so there is no need for an encapsulation command. It only supports 802.1Q.

Step 6: Configure access ports

After already performing basic network switch configurations, it’s time to generate RSA keys to be used during the SSH process, using the crypto commands shown here:

Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes.

Step 7: Set up VTY line config

If you have not set the console line yet, you can easily input these values:

Set the enable password using the enable secret password command. Then, set the privilege exec password with username name privilege 15 secret password. Make sure that the password-encryption service is activated.

Verify SSH access by typing ‘sh ip ssh’ to confirm that the SSH is enabled. You can now try to log in from a remote machine to verify that you can ssh to your Cisco switch.

Finishing touches

You’ve made it through the learning process with (hopefully) minimum bumps and bruises, and you’re just about ready to ride off. All that’s left is to test your access, reload the switch, and ready the cables. Once that’s done, label your switch, rack it up, and go enjoy doing anything that doesn’t involve switch configuration!

If you'd like further assistance, or have more devices to configure, please visit our small business community. There you'll find answers to common questions and connect with people running similar businesses and facing similar IT challenges.

2. Which command will block login attempts on RouterA for a period of 30 seconds if there are 2 failed login attempts within 10 seconds?

RouterA(config)# login block-for 10 attempts 2 within 30
RouterA(config)# login block-for 30 attempts 2 within 10* RouterA(config)# login block-for 2 attempts 30 within 10

RouterA(config)# login block-for 30 attempts 10 within 2

3. What is the purpose of the network security accounting function?

to require users to prove who they are to determine which resources a user can access

to keep track of the actions of a user*

4. What type of attack may involve the use of tools such as nslookup and fping?

access attack
reconnaissance attack* denial of service attack

worm attack

5. Match each weakness with an example. (Not all options are used.)

6. Match the type of information security threat to the scenario. (Not all options are used.)

7. Which example of malicious code would be classified as a Trojan horse?

malware that was written to look like a video game* malware that requires manual user intervention to spread between systems malware that attaches itself to a legitimate program and spreads to other programs when launched

malware that can automatically spread from one system to another by exploiting a vulnerability in the target

8. What is the difference between a virus and a worm?

Viruses self-replicate but worms do not.
Worms self-replicate but viruses do not.* Worms require a host file but viruses do not.

Viruses hide in legitimate programs but worms do not.

Explanation: Worms are able to self-replicate and exploit vulnerabilities on computer networks without user participation.

9. Which attack involves a compromise of data that occurs between two end points?

denial-of-service
man-in-the-middle attack* extraction of security parameters

username enumeration

Explanation: Threat actors frequently attempt to access devices over the internet through communication protocols. Some of the most popular remote exploits are as follows:
Man-In-the-middle attack (MITM) – The threat actor gets between devices in the system and intercepts all of the data being transmitted. This information could simply be collected or modified for a specific purpose and delivered to its original destination.
Eavesdropping attack – When devices are being installed, the threat actor can intercept data such as security keys that are used by constrained devices to establish communications once they are up and running.
SQL injection (SQLi) – Threat actors uses a flaw in the Structured Query Language (SQL) application that allows them to have access to modify the data or gain administrative privileges.
Routing attack – A threat actor could either place a rogue routing device on the network or modify routing packets to manipulate routers to send all packets to the chosen destination of the threat actor. The threat actor could then drop specific packets, known as selective forwarding, or drop all packets, known as a sinkhole attack.

10. Which type of attack involves an adversary attempting to gather information about a network to identify vulnerabilities?

Reconnaissance* DoS dictionary

man-in-the-middle

11. Match the description to the type of firewall filtering. (Not all options are used.)

12. What is the purpose of the network security authentication function?

to require users to prove who they are* to determine which resources a user can access to keep track of the actions of a user

to provide challenge and response questions

Explanation: Authentication, authorization, and accounting are network services collectively known as AAA. Authentication requires users to prove who they are. Authorization determines which resources the user can access. Accounting keeps track of the actions of the user.

13. Which firewall feature is used to ensure that packets coming into a network are legitimate responses to requests initiated from internal hosts?

stateful packet inspection* URL filtering application filtering

packet filtering

14. When applied to a router, which command would help mitigate brute-force password attacks against the router?

exec-timeout 30 service password-encryption banner motd $Max failed logins = 5$

login block-for 60 attempts 5 within 60*

Explanation: The login block-for command sets a limit on the maximum number of failed login attempts allowed within a defined period of time. If this limit is exceeded, no further logins are allowed for the specified period of time. This helps to mitigate brute-force password cracking since it will significantly increase the amount of time required to crack a password. The exec-timeout command specifies how long the session can be idle before the user is disconnected. The service password-encryption command encrypts the passwords in the running configuration. The banner motd command displays a message to users who are logging in to the device.

15. Identify the steps needed to configure a switch for SSH. The answer order does not matter. (Not all options are used.)

Explanation: The login and password cisco commands are used with Telnet switch configuration, not SSH configuration.

16. What feature of SSH makes it more secure than Telnet for a device management connection?

confidentiality with IPsec stronger password requirement random one-time port connection

login information and data encryption*

Explanation: Secure Shell (SSH) is a protocol that provides a secure management connection to a remote device. SSH provides security by providing encryption for both authentication (username and password) and the transmitted data. Telnet is a protocol that uses unsecure plaintext transmission. SSH is assigned to TCP port 22 by default. Although this port can be changed in the SSH server configuration, the port is not dynamically changed. SSH does not use IPsec.

17. What is the advantage of using SSH over Telnet?

SSH is easier to use. SSH operates faster than Telnet.

SSH provides secure communications to access hosts.*

Explanation: SSH provides a secure method for remote access to hosts by encrypting network traffic between the SSH client and remote hosts. Although both Telnet and SSH request authentication before a connection is established, Telnet does not support encryption of login credentials.

18. What is the role of an IPS?

detecting and blocking of attacks in real time* connecting global threat information to Cisco network security devices authenticating and validating traffic

filtering of nefarious websites

Explanation: An intrusion prevention system (IPS) provides real-time detection and blocking of attacks.

19. A user is redesigning a network for a small company and wants to ensure security at a reasonable price. The user deploys a new application-aware firewall with intrusion detection capabilities on the ISP connection. The user installs a second firewall to separate the company network from the public network. Additionally, the user installs an IPS on the internal network of the company. What approach is the user implementing?

attack based risk based structured

layered*

Explanation: Using different defenses at various points of the network creates a layered approach.

20. What is an accurate description of redundancy?

configuring a router with a complete MAC address database to ensure that all frames can be forwarded to the correct destination configuring a switch with proper security to ensure that all traffic forwarded through an interface is filtered designing a network to use multiple virtual devices to ensure that all traffic uses the best path through the internetwork

designing a network to use multiple paths between switches to ensure there is no single point of failure*

Explanation: Redundancy attempts to remove any single point of failure in a network by using multiple physically cabled paths between switches in the network.

21. A network administrator is upgrading a small business network to give high priority to real-time applications traffic. What two types of network services is the network administrator trying to accommodate? (Choose two.)

voice*
video* instant messaging FTP

SNMP

22. What is the purpose of a small company using a protocol analyzer utility to capture network traffic on the network segments where the company is considering a network upgrade?

to identify the source and destination of local network traffic to capture the Internet connection bandwidth requirement

to document and analyze network traffic requirements on each network segment*

Explanation: An important prerequisite for considering network growth is to understand the type and amount of traffic that is crossing the network as well as the current traffic flow. By using a protocol analyzer in each network segment, the network administrator can document and analyze the network traffic pattern for each segment, which becomes the base in determining the needs and means of the network growth.

23. Refer to the exhibit.

An administrator is testing connectivity to a remote device with the IP address 10.1.1.1. What does the output of this command indicate?

Connectivity to the remote device was successful.
A router along the path did not have a route to the destination.* A ping packet is being blocked by a security device along the path.

The connection timed out while waiting for a reply from the remote device.

Explanation: In the output of the ping command, an exclamation mark (!) indicates a response was successfully received, a period (.) indicates that the connection timed out while waiting for a reply, and the letter “U” indicates that a router along the path did not have a route to the destination and sent an ICMP destination unreachable message back to the source.

24. Which method is used to send a ping message specifying the source address for the ping?

Issue the ping command from within interface configuration mode.
Issue the ping command without specifying a destination IP address.* Issue the ping command without extended commands.

Issue the ping command after shutting down un-needed interfaces.

Explanation: By issuing the ping command without a destination IP address in privileged EXEC mode, the Cisco IOS enters extended ping mode. This allows the user to implement extended commands which include source IP address.​

25. A network engineer is analyzing reports from a recently performed network baseline. Which situation would depict a possible latency issue?

a change in the bandwidth according to the show interfaces output a next-hop timeout from a traceroute

an increase in host-to-host ping response times*

Explanation: While analyzing historical reports an administrator can compare host-to-host timers from the ping command and depict possible latency issues.​

26. Which statement is true about Cisco IOS ping indicators?​

‘!’ indicates that the ping was unsuccessful and that the device may have issues finding a DNS server.
‘U’ may indicate that a router along the path did not contain a route to the destination address and that the ping was unsuccessful.* ‘.’ indicates that the ping was successful but the response time was longer than normal.

A combination of ‘.’ and ‘!’ indicates that a router along the path did not have a route to the destination address and responded with an ICMP unreachable message.​

Explanation: The most common indicators of a ping issued from the Cisco IOS are “!”, “.”, and “U”. The “!” indicates that the ping completed successfully, verifying connectivity at Layer 3. The “.” may indicate that a connectivity problem, routing problem, or device security issue exists along the path and that an ICMP destination unreachable message was not provided. The “U” indicates that a router along the path may not have had a route to the destination address, and that it responded with an ICMP unreachable message.

27. A user reports a lack of network connectivity. The technician takes control of the user machine and attempts to ping other computers on the network and these pings fail. The technician pings the default gateway and that also fails. What can be determined for sure by the results of these tests?

The NIC in the PC is bad. The TCP/IP protocol is not enabled. The router that is attached to the same network as the workstation is down.

Nothing can be determined for sure at this point.*

Explanation: In networks today, a failed ping could mean that the other devices on the network are blocking pings. Further investigation such as checking network connectivity from other devices on the same network is warranted.

28. A network technician issues the C:\> tracert -6 www.cisco.com command on a Windows PC. What is the purpose of the -6 command option?

It forces the trace to use IPv6.* It limits the trace to only 6 hops. It sets a 6 milliseconds timeout for each replay.

It sends 6 probes within each TTL time period.

29. Why would a network administrator use the tracert utility?

to determine the active TCP connections on a PC to check information about a DNS name in the DNS server

to identify where a packet was lost or delayed on a network*

Explanation: The tracert utility is used to identify the path a packet takes from source to destination. Tracert is commonly used when packets are dropped or not reaching a specific destination.

30. A ping fails when performed from router R1 to directly connected router R2. The network administrator then proceeds to issue the show cdp neighbors command. Why would the network administrator issue this command if the ping failed between the two routers?

The network administrator suspects a virus because the ping command did not work.
The network administrator wants to verify Layer 2 connectivity.* The network administrator wants to verify the IP address configured on router R2.

The network administrator wants to determine if connectivity can be established from a non-directly connected network.

Explanation: The show cdp neighbors command can be used to prove that Layer 1 and Layer 2 connectivity exists between two Cisco devices. For example, if two devices have duplicate IP addresses, a ping between the devices will fail, but the output of show cdp neighbors will be successful. The show cdp neighbors detail could be used to verify the IP address of the directly connected device in case the same IP address is assigned to the two routers.

31. A network engineer is troubleshooting connectivity issues among interconnected Cisco routers and switches. Which command should the engineer use to find the IP address information, host name, and IOS version of neighboring network devices?

show version show ip route show interfaces

show cdp neighbors detail*

Explanation: The show cdp neighbors detail command reveals much information about neighboring Cisco devices, including the IP address, the capabilities, host name, and IOS version. The show interfaces and show version commands display information about the local device.

32. What information about a Cisco router can be verified using the show version command?

the routing protocol version that is enabled
the value of the configuration register* the operational status of serial interfaces

the administrative distance used to reach networks

Explanation: The value of the configuration register can be verified with the show version command.

33. Which command should be used on a Cisco router or switch to allow log messages to be displayed on remotely connected sessions using Telnet or SSH?

debug all logging synchronous show running-config​

terminal monitor*

34. Which command can an administrator issue on a Cisco router to send debug messages to the vty lines?

terminal monitor* logging console logging buffered

logging synchronous

Explanation: Debug messages, like other IOS log messages, are sent to the console line by default. Sending these messages to the terminal lines requires the terminal monitor command.

35. By following a structured troubleshooting approach, a network administrator identified a network issue after a conversation with the user. What is the next step that the administrator should take?

Verify full system functionality. Test the theory to determine cause.

Establish a theory of probable causes.*

Explanation: A structured network troubleshooting approach should include these steps in sequence: 1. Identify the problem. 2. Establish a theory of probable causes. 3. Test the theory to determine cause. 4. Establish a plan of action to resolve the issue. 5. Verify full system functionality and implement preventive measures.

6. Document findings, actions, and outcomes.

36. Users are complaining that they are unable to browse certain websites on the Internet. An administrator can successfully ping a web server via its IP address, but cannot browse to the domain name of the website. Which troubleshooting tool would be most useful in determining where the problem is?

netstat tracert

nslookup*

Explanation: The nslookup command can be used to look up information about a particular DNS name in the DNS server. The information includes the IP address of the DNS server being used as well as the IP address associated with the specified DNS name. This command can help verify the DNS that is used and if the domain name to IP address resolution works.

37. An employee complains that a Windows PC cannot connect to the Internet. A network technician issues the ipconfig command on the PC and is shown an IP address of 169.254.10.3. Which two conclusions can be drawn? (Choose two.)

The PC cannot contact a DHCP server.* The DNS server address is misconfigured. The default gateway address is not configured.

The PC is configured to obtain an IP address automatically.*

38. Refer to the exhibit.

Host H3 is having trouble communicating with host H1. The network administrator suspects a problem exists with the H3 workstation and wants to prove that there is no problem with the R2 configuration. What tool could the network administrator use on router R2 to prove that communication exists to host H1 from the interface on R2, which is the interface that H3 uses when communicating with remote networks?

traceroute show cdp neighbors Telnet

an extended ping*

39. Refer to the exhibit.

Baseline documentation for a small company had ping round trip time statistics of 36/97/132 between hosts H1 and H3. Today the network administrator checked connectivity by pinging between hosts H1 and H3 that resulted in a round trip time of 1458/2390/6066. What does this indicate to the network administrator?

Connectivity between H1 and H3 is fine. H3 is not connected properly to the network. Something is causing interference between H1 and R1. Performance between the networks is within expected parameters.

Something is causing a time delay between the networks.*

40. Which network service automatically assigns IP addresses to devices on the network?

DHCP* Telnet DNS

traceroute

Explanation: Dynamic Host Configuration Protocol (DHCP) can be used to allow end devices to automatically configure IP information, such as their IP address, subnet mask, DNS server, and default gateway. The DNS service is used to provide domain name resolution, mapping hostnames to IP addresses. Telnet is a method for remotely accessing a CLI session of a switch or router. Traceroute is a command used to determine the path a packet takes as it traverses the network.

41. Which command can an administrator execute to determine what interface a router will use to reach remote networks?

show arp show interfaces

show ip route*

Explanation: The show ip route command is used to display the IP routing table of the router. The IP routing table will show a list of known local and remote networks and the interfaces that the router will use to reach those networks.

42. On which two interfaces or ports can security be improved by configuring executive timeouts? (Choose two.)

Fast Ethernet interfaces
console ports* serial interfaces

vty ports*

Explanation: Executive timeouts allow the Cisco device to automatically disconnect users after they have been idle for the specified time. Console, vty, and aux ports can be configured with executive timeouts.

43. When configuring SSH on a router to implement secure network management, a network engineer has issued the login local and transport input ssh line vty commands. What three additional configuration actions have to be performed to complete the SSH configuration? (Choose three.)

Set the user privilege levels.
Generate the asymmetric RSA keys.*
Configure the correct IP domain name.* Configure role-based CLI access.

Create a valid local username and password database.*

Explanation: SSH is automatically enabled after the RSA keys are generated. Setting user privilege levels and configuring role-based CLI access are good security practices but are not a requirement of implementing SSH.

44. What is considered the most effective way to mitigate a worm attack?

Change system passwords every 30 days. Ensure that all systems have the most current virus definitions. Ensure that AAA is configured in the network.

Download security updates from the operating system vendor and patch all vulnerable systems.*

Explanation: Because worms take advantage of vulnerabilities in the system itself, the most effective way to mitigate worm attacks is to download security updates from the operating system vendor and patch all vulnerable systems.

45. Which statement describes the ping and tracert commands?

Tracert shows each hop, while ping shows a destination reply only.* Tracert uses IP addresses; ping does not. Both ping and tracert can show results in a graphical display.

Ping shows whether the transmission is successful; tracert does not.

Explanation: The ping utility tests end-to-end connectivity between the two hosts. However, if the message does not reach the destination, there is no way to determine where the problem is located. On the other hand, the traceroute utility (tracert in Windows) traces the route a message takes from its source to the destination. Traceroute displays each hop along the way and the time it takes for the message to get to that network and back.

46. A technician is to document the current configurations of all network devices in a college, including those in off-site buildings. Which protocol would be best to use to securely access the network devices?

FTP HTTP

SSH*

Explanation: Telnet sends passwords and other information in clear text, while SSH encrypts its data. FTP and HTTP do not provide remote device access for configuration purposes.

47. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

Which command has to be configured on the router to complete the SSH configuration?

service password-encryption
transport input ssh* enable secret class

ip domain-name cisco.com

Explanation: The missing command to complete the SSH configuration is transport input ssh in line vty 0 4 mode.The commands service password-encryption and enable secret class do configure secure features on the router, but are not required to configure SSH. The command ip domain-name cisco.com is not required because the command ip domain-name span.com has been used.

48. An administrator decides to use “WhatAreyouwaiting4” as the password on a newly installed router. Which statement applies to the password choice?

It is strong because it uses a passphrase.* It is weak because it is often the default password on new devices. It is weak since it uses easily found personal information.

It is weak since it is a word that is easily found in the dictionary.

49. An administrator decides to use “pR3s!d7n&0” as the password on a newly installed router. Which statement applies to the password choice?

It is strong because it uses a minimum of 10 numbers, letters and special characters.* It is weak because it is often the default password on new devices. It is weak since it uses easily found personal information.

It is weak since it is a word that is easily found in the dictionary.

50. An administrator decides to use “5$7*4#033!” as the password on a newly installed router. Which statement applies to the password choice?

It is strong because it contains 10 numbers and special characters.* It is weak because it is often the default password on new devices. It is weak since it uses easily found personal information.

It is strong because it uses a minimum of 10 numbers, letters and special characters.

51. An administrator decides to use “pR3s!d7n&0” as the password on a newly installed router. Which statement applies to the password choice?

It is strong because it uses a minimum of 10 numbers, letters and special characters.* It is weak since it is a word that is easily found in the dictionary. It is strong because it uses a passphrase.

It is strong because it contains 10 numbers and special characters.

52. An administrator decides to use “12345678!” as the password on a newly installed router. Which statement applies to the password choice?

It is weak because it uses a series of numbers or letters.* It is strong because it uses a passphrase. It is weak since it is a word that is easily found in the dictionary.

It is strong because it uses a minimum of 10 numbers, letters and special characters.

53. An administrator decides to use “admin” as the password on a newly installed router. Which statement applies to the password choice?

It is weak because it is often the default password on new devices.* It is strong because it uses a passphrase. It is strong because it uses a minimum of 10 numbers, letters and special characters.

It is strong because it contains 10 numbers and special characters.

54. An administrator decides to use “Feb121978” as the password on a newly installed router. Which statement applies to the password choice?

It is weak because it uses easily found personal information.* It is strong because it uses a passphrase. It is weak since it is a word that is easily found in the dictionary.

It is strong because it uses a minimum of 10 numbers, letters and special characters.

55. An administrator decides to use “password” as the password on a newly installed router. Which statement applies to the password choice?

It is weak because it is a commonly used password.* It is weak since it is a word that is easily found in the dictionary. It is strong because it uses a passphrase.

It is strong because it uses a minimum of 10 numbers, letters and special characters.

56. An administrator decides to use “RobErT” as the password on a newly installed router. Which statement applies to the password choice?

It is weak since it uses easily found personal information.* It is strong because it uses a passphrase. It is strong because it uses a minimum of 10 numbers, letters and special characters.

It is strong because it contains 10 numbers and special characters.

57. An administrator decides to use “Elizabeth” as the password on a newly installed router. Which statement applies to the password choice?

It is weak because it uses easily found personal information.* It is strong because it uses a passphrase. It is weak since it is a word that is easily found in the dictionary.

It is strong because it uses a minimum of 10 numbers, letters and special characters.

Rules for strong passwords: * minimum of 8 characters, preferably 10. * use complex combinations of numbers, special characters, and upper and lower case letters. * avoid repetition, common dictionary words, letter or number sequences. * avoid names of children, relatives, pets, birthdays, or any easily identifiable personal information.

* can be created by misspelling words or replacing vowels with numbers or special characters.

58. A network technician is troubleshooting an issue and needs to verify the IP addresses of all interfaces on a router. What is the best command to use to accomplish the task?

show ip interface brief* nslookup ipconfig getifaddr en0

show ip route

59. Students who are connected to the same switch are having slower than normal response times. The administrator suspects a duplex setting issue. What is the best command to use to accomplish the task?

show interfaces* ipconfig getifaddr en0 copy running-config startup-config

show ip nat translations

60. A user wants to know the IP address of the PC. What is the best command to use to accomplish the task?

Ipconfig* copy running-config startup-config show interfaces

show ip nat translations

61. A student wants to save a router configuration to NVRAM. What is the best command to use to accomplish the task?

copy running-config startup-config* show interfaces show ip nat translations

show ip route

62. A support technician needs to know the IP address of the wireless interface on a MAC. What is the best command to use to accomplish the task?

ipconfig getifaddr en0* copy running-config startup-config show interfaces

show ip nat translations

63. A network technician is troubleshooting an issue and needs to verify all of the IPv6 interface addresses on a router. What is the best command to use to accomplish the task?

show ipv6 interface* show interfaces show ip nat translations

show ip route

64. A teacher is having difficulties connecting his PC to the classroom network. He needs to verify that a default gateway is configured correctly. What is the best command to use to accomplish the task?

Ipconfig* copy running-config startup-config show interfaces

show ip nat translations

65. Only employees connected to IPv6 interfaces are having difficulty connecting to remote networks. The analyst wants to verify that IPv6 routing has been enabled. What is the best command to use to accomplish the task?

show running-config* show interfaces copy running-config startup-config

show ip nat translations

66. An administrator is troubleshooting connectivity issues and needs to determine the IP address of a website. What is the best command to use to accomplish the task?

Nslookup* show ipv6 route show ipv6 interface

copy startup-config running-config

67. Only employees connected to IPv6 interfaces are having difficulty connecting to remote networks. The analyst wants to verify that IPv6 routing has been enabled. What is the best command to use to accomplish the task?

show running-config* show ipv6 route show ipv6 interface

copy startup-config running-config

Modules 16 – 17: Building and Securing a Small Network Exam Answers (Additional)

1. Which component is designed to protect against unauthorized communications to and from a computer?

security center port scanner antimalware antivirus

firewall*

2. Which command will block login attempts on RouterA for a period of 30 seconds if there are 2 failed login attempts within 10 seconds?

RouterA(config)# login block-for 10 attempts 2 within 30
RouterA(config)# login block-for 30 attempts 2 within 10* RouterA(config)# login block-for 2 attempts 30 within 10

RouterA(config)# login block-for 30 attempts 10 within 2

3. What is the purpose of the network security accounting function?

to require users to prove who they are to determine which resources a user can access

to keep track of the actions of a user*

4. What type of attack may involve the use of tools such as nslookup and fping?

access attack
reconnaissance attack* denial of service attack

worm attack

5. Which benefit does SSH offer over Telnet for remotely managing a router?

Encryption* TCP usage authorization

connections via multiple VTY lines

6. What is one of the most effective security tools available for protecting users from external threats?

Firewalls* router that run AAA services patch servers

password encryption techniques

7. Which type of network threat is intended to prevent authorized users from accessing resources?

DoS attacks* access attacks reconnaissance attacks

trust exploitation

8. Which three services are provided by the AAA framework? (Choose three.)

accounting* automation

authorization*

autoconfiguration

9. Which malicious code attack is self-contained and tries to exploit a specific vulnerability in a system being attacked?

virus
worm* Trojan horse

social engineering

10. Some routers and switches in a wiring closet malfunctioned after an air conditioning unit failed. What type of threat does this situation describe?

configuration
environmental* electrical

maintenance

11. What does the term vulnerability mean?

a weakness that makes a target susceptible to an attack* a computer that contains sensitive information a method of attack to exploit a target a known target or victim machine

a potential threat that a hacker creates

12. What three configuration steps must be performed to implement SSH access to a router? (Choose three.)

a password on the console line
an IP domain name*
a user account* an enable mode password

a unique hostname*

13. What is the objective of a network reconnaissance attack?

discovery and mapping of systems* unauthorized manipulation of data disabling network systems or services

denying access to resources by legitimate users

14. For security reasons a network administrator needs to ensure that local computers cannot ping each other. Which settings can accomplish this task?

smartcard settings
firewall settings* MAC address settings

file system settings

15. A network administrator establishes a connection to a switch via SSH. What characteristic uniquely describes the SSH connection?

out-of-band access to a switch through the use of a virtual terminal with password authentication remote access to the switch through the use of a telephone dialup connection on-site access to a switch through the use of a directly connected PC and a console cable

remote access to a switch where data is encrypted during the session*

16. Which network design consideration would be more important to a large corporation than to a small business?

Internet router firewall low port density switch

redundancy*

17. A newly hired network technician is given the task of ordering new hardware for a small business with a large growth forecast. Which primary factor should the technician be concerned with when choosing the new devices?

devices with a fixed number and type of interfaces devices that have support for network monitoring redundant devices

devices with support for modularity*

18. What type of traffic would most likely have the highest priority through the network?

FTP instant messaging

voice*

19. A network technician is investigating network connectivity from a PC to a remote host with the address 10.1.1.5. Which command, when issued on a Windows PC, will display the path to the remote host?

trace 10.1.1.5 traceroute 10.1.1.5

tracert 10.1.1.5*

20. A user is unable to reach the website when typing ht​tp://ww​w.cisco.com in a web browser, but can reach the same site by typing ht​tp://72.163.4.161. What is the issue?

default gateway DHCP

DNS*

21. Where are Cisco IOS debug output messages sent by default?

memory buffers vty lines Syslog server

console line*

22. Which element of scaling a network involves identifying the physical and logical topologies?

traffic analysis
network documentation* device inventory

cost analysis

23. What mechanism can be implemented in a small network to help minimize network latency for real-time streaming applications?

QoS* PoE AAA

ICMP

24. Which process failed if a computer cannot access the internet and received an IP address of 169.254.142.5?

IP DNS

DHCP*

25. A small company has only one router as the exit point to its ISP. Which solution could be adopted to maintain connectivity if the router itself, or its connection to the ISP, fails?

Activate another router interface that is connected to the ISP, so the traffic can flow through it.
Have a second router that is connected to another ISP.* Purchase a second least-cost link from another ISP to connect to this router.

Add more interfaces to the router that is connected to the internal network.

26. When should an administrator establish a network baseline?

when the traffic is at peak in the network when there is a sudden drop in traffic at the lowest point of traffic in the network

at regular intervals over a period of time*

27. Which two traffic types require delay sensitive delivery? (Choose two.)

email web FTP

Voice*

28. A network technician suspects that a particular network connection between two Cisco switches is having a duplex mismatch. Which command would the technician use to see the Layer 1 and Layer 2 details of a switch port?

show interfaces* show running-config show ip interface brief​

show mac-address-table

29. Which statement is true about CDP on a Cisco device?​

The show cdp neighbor detail command will reveal the IP address of a neighbor only if there is Layer 3 connectivity​. To disable CDP globally, the no cdp enable command in interface configuration mode must be used.

CDP can be disabled globally or on a specific interface​.*

30. What factor should be considered in the design of a small network when devices are being chosen?

cost of devices* redundancy traffic analysis

ISP