Networking Essentials (Version 2) – Modules 17 – 20: Introduction to Cisco Networking Pre-Test Exam

 

Networking Essentials Module Group 5: Pretest Exam Answers

Networking Essentials (Version 2) – Modules 17 – 20: Introduction to Cisco Networking Pre-Test Exam Answers

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1. What is required for a network administrator to perform out-of-band management tasks on a Cisco device?

• a computer directly connected to the console port of the device
• a valid IP address configured on VLAN 1
• an active network connection available to the device
• SSH enabled and functional on the device

Explanation: With out-of-band management, the only requirement is to have a computer directly connected to the console port of the device. This is the primary method to configure a new device because no network connection or prior configurations on the device is required.

2. Which two files are loaded into RAM of a Cisco switch when it is booted? (Choose two.)

• IOS image file
• routing table
• file that contains customer settings
• running configuration file
• startup configuration file

Explanation: When a Cisco device boots, it loads the IOS and startup configuration files into RAM.

3. Which two ports can be used for the initial configuration of a Cisco router? (Choose two.)

• AUX
• console
• WAN interface
• flash slot
• LAN interface

Explanation: The AUX and console ports on a Cisco 1941 router can be used to perform initial setup. The initial setup does not require that the router be connected to a network. A network administrator uses a computer to connect to the console ports directly. A network administrator can also access the router remotely through a dialup phone line and a modem connected to the AUX port. LAN and WAN interfaces are used to connect to networks. The flash slots expand storage capability through the use of a compact flash card.

4. When a router is powered on, where will the router first search for a valid IOS image to load by default?

• flash memory
• NVRAM
• RAM
• ROM

Explanation: By default, if no boot system commands are in the configuration, a router will load the first valid Cisco IOS image in flash memory and run it. RAM is active memory that is not used to store image files. NVRAM stores configuration files. ROM stores a minimal version of the Cisco IOS image that can be used to provide limited functions if a valid IOS image is not available in flash memory.

5. Refer to the exhibit. An administrator is trying to configure the switch but receives the error message that is displayed in the exhibit. What is the problem?

• The administrator must first enter privileged EXEC mode before issuing the command.
• The administrator must connect via the console port to access global configuration mode.
• The administrator is already in global configuration mode.
• The entire command, configure terminal , must be used.

Explanation: In order to enter global configuration mode, the command configure terminal , or a shortened version such as config t , must be entered from privileged EXEC mode. In this scenario the administrator is in user EXEC mode, as indicated by the > symbol after the hostname. The administrator would need to use the enable command to move into privileged EXEC mode before entering the configure terminal command.

16. Which keys act as a hot key combination that is used to interrupt an IOS process?

• Ctrl-Shift-X
• Ctrl-C
• Ctrl-Shift-6
• Ctrl-Z

Explanation: The Cisco IOS provides both hot keys and shortcuts for configuring routers and switches. The Ctrl-Shift-6 hot key combination is used to interrupt an IOS process, such as a ping or traceroute. Ctrl-Z is used to exit the configuration mode. Ctrl-C aborts the current command. Ctrl-Shift-X has no IOS function.

17. What function does pressing the Tab key have when entering a command in IOS?

• It moves the cursor to the beginning of the next line.
• It exits configuration mode and returns to user EXEC mode.
• It completes the remainder of a partially typed word in a command.
• It aborts the current command and returns to configuration mode.

Explanation: Pressing the Tab key after a command has been partially typed will cause the IOS to complete the rest of the command.

18. While troubleshooting a network problem, a network administrator issues the show version command on a router. What information can be found by using this command?

• the version of the routing protocol that is running on the router
• the bandwidth, encapsulation, and I/O statistics on the interfaces
• the amount of NVRAM, DRAM, and flash memory installed on the router
• differences between the backup configuration and the current running configuration

Explanation: The show version command displays much information about the device, including the amount of memory (flash, NVRAM, and DRAM) that is installed on the device.

19. Which interface is the default SVI on a Cisco switch?

• VLAN 99
• FastEthernet 0/1
• GigabitEthernet 0/1
• VLAN 1

Explanation: An SVI is a virtual interface and VLAN 1 is enabled by default on Cisco switches. VLAN 99 must be configured to be used. FastEthernet 0/1 and GigabitEthernet 0/1 are physical interfaces.

10. What is the effect of using the Router# copy running-config startup-config command on a router?

• The contents of ROM will change.
• The contents of NVRAM will change.
• The contents of flash will change.
• The contents of RAM will change.

Explanation: The command copy running-config startup-config copies the running-configuration file from RAM into NVRAM and saves it as the startup-configuration file. Since NVRAM is none-volatile memory it will be able to retain the configuration details when the router is powered off.

11. A network administrator enters the service password-encryption command into the configuration mode of a router. What does this command accomplish?

• This command prevents someone from viewing the running configuration passwords.
• This command automatically encrypts passwords in configuration files that are currently stored in NVRAM.
• This command provides an exclusive encrypted password for external service personnel who are required to do router maintenance.
• This command enables a strong encryption algorithm for the enable secret password command.
• This command encrypts passwords as they are transmitted across serial WAN links.

Explanation: The startup-config and running-config files display most passwords in plaintext. Use the service password-encryption global config command to encrypt all plaintext passwords in these files.

12. What happens when the transport input ssh command is entered on the switch vty lines?

• Communication between the switch and remote users is encrypted.
• The switch requires a username/password combination for remote access.
• The SSH client on the switch is enabled.
• The switch requires remote connections via a proprietary client software.

Explanation: The transport input ssh command when entered on the switch vty (virtual terminal lines) will encrypt all inbound controlled telnet connections.

13. A small office uses a wireless router to connect to a cable modem for Internet access. The network administrator receives a call that one office computer cannot access external websites. The first troubleshooting step that the network administrator performs is to ping the wireless router from the office computer. Which troubleshooting technique does this represent?

• substitution
• bottom-up
• top-down
• divide-and-conquer

Explanation: A ping to the wireless router can verify Layer 3 connectivity. As a troubleshooting method, this is the divide-and-conquer approach.

14. What are two common causes of a physical layer network connectivity problem? (Choose two.)

• an incorrect default gateway
• a monitor unplugged
• an Ethernet cable plugged into a wrong port
• a faulty Ethernet cable
• an unassigned IP address

Explanation: An Ethernet cable plugged into a wrong port and a faulty Ethernet cable are two possible causes for physical network connectivity issues. An incorrect default gateway configuration and a lack of an IP address will cause logical connectivity issues.

15. Refer to the exhibit. A web designer calls to report that the web server web-s1.cisco.com is not reachable through a web browser. The technician uses command line utilities to verify the problem and to begin the troubleshooting process. Which two things can be determined about the problem? (Choose two.)

• The web server at 192.168.0.10 is reachable from the source host.
• DNS cannot resolve the IP address for the server web-s1.cisco.com.
• A router is down between the source host and the server web-s1.cisco.com.
• There is a problem with the web server software on web-s1.cisco.com.
• The default gateway between the source host and the server at 192.168.0.10 is down.

Explanation: The successful result of the ping to the IP address indicates that the network is operational and the web server is online. However, the fact that the ping to the domain name of the server fails indicates there is a DNS issue, namely that the host cannot resolve the domain name to its associated IP address.

16. Which command would a technician use to display network connections on a host computer?

• ipconfig
• nslookup
• tracert
• netstat

Explanation: The netstat command is a network utility that can be used to display active TCP connections that are open and running on a networked host.