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Spring 2014 > Cisco Networking Fundamentals > Flashcards

Flashcards in Cisco Networking Fundamentals Deck (95)
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Home routers are 4 devices in one:

- router
- switch
- wireless access point
- firewall

1

Intermediary devices / network devices

Devices used to transport data across the network.

2

Cisco IOS

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.

3

The kernel

The portion of the OS code that interacts directly with the computer hardware.

4

The shell

The portion of the OS that interfaces with the applications and the user. The kernel is between the shell and the hardware.

5

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
- routing
- enabling QoS
- network management

6

3 most common methods for accessing the CLI environment:

- console (cable)
- Telnet or SSH
- AUX port

7

Cisco IOS modes hierarchical structure:

Same for router or switch

- User executive mode - Router>
View-only mode
- Privileged executive mode - Router#
- Global configuration mode - Router(config)#
Affects the whole device
- other specific configuration modes
Like for a specific interface/engine/line

8

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.

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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.

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Global configuration mode

The primary configuration mode. Must be here to get to the specific configuration modes.

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CLI command to go from privileged EXEC to global configuration:

Switch# configure terminal

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Interface mode

(A specific configuration mode)

To configure one of the network interfaces. (Fa0/0, S0/0/0)

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Line mode

(A specific configuration mode)

To configure one of the physical or virtual lines (console, AUX, VTY)

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To leave configuration mode completely and return to privileged EXEC:

end

15

To go from user exec to privileged exec:

enable

(disable goes back to user exec)

16

Entering "exit" in privileged exec:

Ends the console session.

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CLI hot key: Ctrl-A

Moves to the beginning of the line.

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CLI hot key: Ctrl-E

Moves to the end of the line.

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CLI hot key: Ctrl-R

Redisplays a line.

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CLI hot key: Ctrl-Z

Exits the configuration mode and goes back to privileged exec.

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CLI hot key: Ctrl-C

Exits the configuration mode or aborts the current command. Cancels the current command and returns to privileged exec mode.

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show interface

Displays statistics for all interfaces on the device. Add the slot/port number to see the stats for that particular one.

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show startup-config

Displays the saved configuration located in NVRAM.

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show running-config

Displays the contents of the currently running configuration file.

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show version

Displays information about the currently loaded IOS version, along with hardware and device information.

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IOS hostname

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

27

enable password

Limits access to the privileged exec mode

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enable secret

Encrypted, limits access to the privileged exec mode

29

console password

Limits devices access using the console connection. Must go into line configuration mode to set this password.