Remember the various configuration register commands and settings. The 0x2102 setting is
the default on all Cisco routers and tells the router to look in NVRAM for the boot sequence.
0x2101 tells the router to boot from ROM, and 0x2142 tells the router to not load the startupconfig
in NVRAM to provide password recovery.
Remember how to back up an IOS image. By using the privileged-mode command copy
flash tftp, you can back up a file from flash memory to a TFTP (network) server.
Remember how to restore or upgrade an IOS image. By using the privileged-mode command
copy tftp flash, you can restore or upgrade a file from a TFTP (network) server to
flash memory.
Remember what you must complete before you back up an IOS image to a network server.
Make sure that you can access the network server, ensure that the network server has adequate
space for the code image, and verify the file naming and path requirement.
Remember how to save the configuration of a router. There are a couple of ways to do this, but
the most common, as well as most tested, method is copy running-config startup-config.
Remember how to erase the configuration of a router. Type the privileged-mode command
erase startup-config and reload the router.
Understand when to use CDP. Cisco Discovery Protocol can be used to help you document
as well as troubleshoot your network.
Remember what the output from the show cdp neighbors command shows. The show
cdp neighbors command provides the following information: device ID, local interface,
holdtime, capability, platform, and port ID (remote interface).
Understand how to telnet into a router and keep your connection but return to your
originating console. If you telnet to a router or switch, you can end the connection by
typing exit at any time. However, if you want to keep your connection to a remote device
but still come back to your original router console, you can press the Ctrl+Shift+6 key
combination, release it, and then press X.
Remember the command to verify your Telnet sessions. The command show sessions
will provide you with information about all the sessions your router has with other routers.
Remember how to build a static host table on a router. By using the global configuration
command ip host host_name ip_address, you can build a static host table on your router.
You can apply multiple IP addresses against the same host entry.
Remember how to verify your host table on a router. You can verify the host table with the
show hosts command.
Understand when to use the ping command. Packet Internet Groper (Ping) uses ICMP echo
request and ICMP echo replies to verify an active IP address on a network.
Remember how to ping a valid host ID. You can ping an IP address from a router's user
mode or privileged mode but not from configuration mode. You must ping a valid address,
such as 1.1.1.1.
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