Chapter 4 Flashcards
An interface that enables the user to interact with the operating system by entering commands and optional arguments
Command-line interface
A part of the Cisco IOS Software CLI in which the user can type configuration commands that are then added to the device’s currently used configuration file (running-config).
Configuration-Mode
A part of the Cisco IOS CLI in which the user can use the most powerful and potentially disruptive commands on a router or switch, including the ability to then reach configuration mode and reconfigure the router.
enable mode
The operating system (OS) of Cisco routers and switches, which provides the majority of a router’s or switch’s features, with the hardware providing the remaining features.
Internetwork Operating System
A Cisco operating system (OS) with a modern Linux-based multitasking software architecture used as the OS for many enterprise-class LAN switch and router products.
IOS XE
For connections to the RJ-45 console port rather than USB console port of a Cisco device, the type of cable used between the user PC and the console port. The UTP rollover cable uses a rollover pinout with eight pins, connecting pin 1 to pin 8, pin 2 to pin 7, and so on.
rollover cable
Stores the currently used configuration commands. This file changes dynamically when someone enters commands in configuration mode.
running-config file
A TCP/IP application layer protocol that supports terminal emulation between a client and server, using dynamic key exchange and encryption to keep the communications private.
Secure Shell (SSH)
In Cisco IOS switches and routers, the name of the file that resides in NVRAM memory, holding the device’s configuration that will be loaded into RAM as the running-config file when the device is next reloaded or powered on.
startup-config file
he standard terminal-emulation application layer protocol in the TCP/IP protocol stack. Telnet is used for remote terminal connection, enabling users to log in to remote systems and use resources as if they were connected to a local system. Telnet is defined in RFC 854.
Telnet
A mode of the user interface to a router or switch in which the user can type only nondisruptive EXEC commands, generally just to look at the current status, but not to change any operational settings.
user mode
Global command that changes the context to console configuration mode.
line console 0
command, Line (console and vty) configuration mode. Tells IOS to prompt for a password (no username).
login
Line (console and vty) configuration mode. Sets the password required on that line for login if the login command (with no other parameters) is also configured.
password pass-value
Global command that changes the context to interface mode—for example, interface FastEthernet 0/1.
interface type port-number
Interface subcommand that sets the Ethernet interface speed on interfaces that support multiple speeds.
speed value
Global command that sets this switch’s hostname, which is also used as the first part of the switch’s command prompt.
hostname name
Command that moves back to the next higher mode in configuration mode.
exit
Command that exits configuration mode and goes back to enable mode from any of the configuration submodes.
end
This is not a command, but rather a two-key combination (pressing the Ctrl key and the letter Z) that together do the same thing as the end command.
Ctrl+Z
Privileged mode EXEC command to disable all currently enabled debugs.
no debug all
undebug all
Privileged mode EXEC command that reboots the switch or router.
reload
Privileged mode EXEC command that saves the active config, replacing the startup-config file used when the switch initializes.
copy running-config startup-config
Privileged mode EXEC command that merges the startup-config file with the currently active config file in RAM.
copy startup-config running-config
Privileged mode EXEC command that lists the contents of the running-config file.
show running-config
Privileged mode EXEC command that erases the startup-config file.
write erase
erase startup-config
erase nvram:
EXEC command that disconnects the user from the CLI session.
quit
Privileged mode EXEC command that lists the contents of the startup-config (initial config) file.
show startup-config
User mode EXEC command that moves the user from user mode to enable (privileged) mode and prompts for a password if one is configured.
enable
Privileged mode EXEC command that moves the user from privileged mode to user mode.
disable
Privileged mode EXEC command that moves the user into configuration mode.
configure terminal
EXEC command that lists the contents of a switch forwarding (MAC) table.
show mac address-table
