cdp enable:

Turns on CDP on an individual interface. [TOC]

cdp holdtime:

Changes the holdtime of CDP packets. [TOC]

cdp run:

Turns on CDP on a router. [TOC]

cdp timer:

Changes the CDP update timer. [TOC]

clear line:

Clears a connection connected via Telnet to your router. [TOC]

config-register:

Tells the router how to boot and to change the configuration register setting. [TOC]

copy flash tftp:

Copies a file from flash memory to a TFTP host. [TOC]

copy run start:

Copies the running-config file to the startup-config file. [TOC]

copy run tftp:

Copies the running-config file to a TFTP host. [TOC]

copy tftp flash:

Copies a file from a TFTP host to flash memory. a TFTP host to the running-config file

copy tftp run:

Copies a configuration from a TFTP host to the running-config file. [TOC]

Ctrl+Shift+6, then X (keybord combination):

Returns you to the originating router when you telnet to numerous routers. [TOC]

delete nvram:

Deletes the contents of NVRAM on a 1900 switch. [TOC]

disconnect:

Disconnects a connection to a remote router from the originating router. [TOC]

erase startup-config:

Deletes the contents of NVRAM on a router. [TOC]

exit:

Disconnects a connection to a remote router via telnet. [TOC]

ip domain-lookup:

Turns on DNS lookup ( which is on by default). [TOC]

ip domain-name:

Appends a domain name to a DNS lookup. [TOC]

ip host:

Creates a host table on a router. [TOC]

ip name-server:

Sets the IP address of up to six DNS servers. [TOC]

no cdp enable:

Turns off CDP on an individual interface. [TOC]

no cdp run:

Turns off CDP completely on a router. [TOC]

no ip domain-lookup:

Turns off DNS lookup. [TOC]

no ip host:

Removes a hostname from a host table. [TOC]

o/r 0x2142:

Changes a 2501 to boot without using the contents of NVRAM. [TOC]

ping:

Tests IP connectivity to a remote device. [TOC]

show cdp:

Displays the CDP timer and holdtime frequencies. [TOC]

show cdp entry *:

Same as show cdp neighbor detail, but does not work on a 1900 switch. [TOC]

show cdp interface:

Shows the individual interfaces enabled with CDP. [TOC]

show cdp neighbor:

Shows directly connected neighbors and the details about them. [TOC]

show cdp neighbor detail:

Shows IP address and IOS version and type, and includes all of the information from the show cdp neighbor command. [TOC]

show cdp traffic:

Shows the CDP packets sent and received on a device and any errors. [TOC]

show flash:

Shows the files in flash memory. [TOC]

show hosts:

Shows the contents of the host table. [TOC]

show run:

Displays the running-config file. [TOC]

show sessions:

SHows your connections via Telnet to remote devices. [TOC]

show start:

Displays the startup-config file. [TOC]

show version:

Displays the IOS type and version as well as the configuration register. [TOC]

telnet:

Connects, views, and runs programs on a remote device. [TOC]

tftp-server system ios-name:

Creates a TFTP-server host for a router system image that is run in flash. [TOC]

trace:

Tests a connection to a remote device and shows the path it took through the internetwork to find the remote device. [TOC]