Chapter 4. Using the Command-Line Interface

Question 1

1. In what modes can you type the command show mac address-table and expect to get a response with MAC table entries? (Choose two answers.)
   a) .User mode
   b) .Enable mode
   c) .Global configuration mode
   d) .Interface configuration mode

Answer 1

1. A and B. The command in the question is an EXEC command that happens to require only user mode access. As such, you can use this command in both user mode and enable mode. Because it is an EXEC command, you cannot use the command (as shown in the question) in configuration mode. Note that you can put the word do in front of the EXEC command while in configuration mode (for example, do show mac address-table) to issue the command from inside any configuration mode.

Question 2

2. In which of the following modes of the CLI could you type the command reload and expect the switch to reboot?
   a) .User mode
   b) .Enable mode
   c) .Global configuration mode
   d) .Interface configuration mode

Answer 2

2. B. The command referenced in the question, the reload command, is an EXEC com-mand that happens to require privileged mode, also known as enable mode. This com-mand is not available in user mode. Note that you can put the word do in front of the EXEC command while in configuration mode (for example, do reload) to issue the command from inside any configuration mode.

Question 3

3. Which of the following is a difference between Telnet and SSH as supported by a Cisco switch?
   a) .SSH encrypts the passwords used at login, but not other traffic; Telnet encrypts nothing.
   b) .SSH encrypts all data exchange, including login passwords; Telnet encrypts nothing.
   c) .Telnet is used from Microsoft operating systems, and SSH is used from UNIX and Linux operating systems.
   d) .Telnet encrypts only password exchanges; SSH encrypts all data exchanges.

Answer 3

3. B. SSH provides a secure remote login option, encrypting all data flows, including password exchanges. Telnet sends all data (including passwords) as clear text.

Question 4

4. What type of switch memory is used to store the configuration used by the switch when it is up and working?
   a. RAM
   b. ROM
   c. Flash
   d. NVRAM
   e. Bubble

Answer 4

4. A. Switches (and routers) keep the currently used configuration in RAM, using NVRAM to store the configuration file that is loaded when the switch (or router) next loads the IOS.

Question 5

5. What command copies the configuration from RAM into NVRAM?
   a) .copy running-config tftp
   b) .copy tftp running-config
   c) .copy running-config start-up-config
   d) .copy start-up-config running-config
   e) .copy startup-config running-config
   f) .copy running-config startup-config

Answer 5

5. F. The startup-config file is in NVRAM, and the running-config file is in RAM.

Question 6

6. A switch user is currently in console line configuration mode. Which of the following would place the user in enable mode? (Choose two answers.)
   a. Using the exit command once
   b. Using the end command once
   c. Pressing the Ctrl+Z key sequence once
   d. Using the quit command

Answer 6

6. B and C. The exit command moves the user one config mode backward, toward global configuration mode, or if already in global configuration mode, it moves the user back to enable mode. From console mode, it moves the user back to global configuration mode. The end command and the Ctrl+Z key sequence both move the user back to enable mode regardless of the current configuration submode.