Flashcards in Cisco Networking Fundamentals Deck (95)
Home routers are 4 devices in one:
- wireless access point
Intermediary devices / network devices
Devices used to transport data across the network.
The Cisco Internetwork Operating System. A generic term for the collection of network operation systems used on Cisco networking devices. Cisco IOS is used for most Cisco devices.
Stored in a semi-permanent memory area called flash.
The portion of the OS code that interacts directly with the computer hardware.
The portion of the OS that interfaces with the applications and the user. The kernel is between the shell and the hardware.
Major functions performed or enabled by Cisco routers:
- network security
- IP addressing of virtual and physical interfaces
- enabling network-specific configurations to optimize connectivity of their respective media
- enabling QoS
- network management
3 most common methods for accessing the CLI environment:
- console (cable)
- Telnet or SSH
- AUX port
Cisco IOS modes hierarchical structure:
Same for router or switch
- User executive mode - Router>
- Privileged executive mode - Router#
- Global configuration mode - Router(config)#
Affects the whole device
- other specific configuration modes
Like for a specific interface/engine/line
User EXEC mode
Allows a limited number of monitoring commands. View-only mode. Does not allows any commands that might change the device. Will need to set up a password.
Privileged EXEC mode
Allows configuration and management commands. Will need to set up a password. Must be here to access global configuration and all other modes.
Global configuration mode
The primary configuration mode. Must be here to get to the specific configuration modes.
CLI command to go from privileged EXEC to global configuration:
Switch# configure terminal
(A specific configuration mode)
To configure one of the network interfaces. (Fa0/0, S0/0/0)
(A specific configuration mode)
To configure one of the physical or virtual lines (console, AUX, VTY)
To leave configuration mode completely and return to privileged EXEC:
To go from user exec to privileged exec:
(disable goes back to user exec)
Entering "exit" in privileged exec:
Ends the console session.
CLI hot key: Ctrl-A
Moves to the beginning of the line.
CLI hot key: Ctrl-E
Moves to the end of the line.
CLI hot key: Ctrl-R
Redisplays a line.
CLI hot key: Ctrl-Z
Exits the configuration mode and goes back to privileged exec.
CLI hot key: Ctrl-C
Exits the configuration mode or aborts the current command. Cancels the current command and returns to privileged exec mode.
Displays statistics for all interfaces on the device. Add the slot/port number to see the stats for that particular one.
Displays the saved configuration located in NVRAM.
Displays the contents of the currently running configuration file.
Displays information about the currently loaded IOS version, along with hardware and device information.
The name of the switch or router. Case sensitive. Must be in global configuration mode.
- start with a letter
- no spaces
- end with a letter or digit
- only letters, digits, and dashes
- less than 64 characters
Type: hostname whateverhostname
no hostname would remove the name of the device
Limits access to the privileged exec mode
Encrypted, limits access to the privileged exec mode