Ccna 1 Chapter 11

Front 1

What is the Cisco OS called?

Back 1

The Cisco Internetwork Operating System (IOS)

Front 2

The Cisco IOS provides devices with the following network services:

Back 2

Basic routing and switching functions
Reliable and secure access to networked resources
Network scalability

Front 3

The services provided by the Cisco IOS are generally accessed how?

Back 3

using a command line interface (CLI).

Front 4

There are several ways to access the CLI environment. The most usual methods are:

Back 4

Console
Telnet or SSH
AUX port

Front 5

a console session is also known as

Back 5

CTY line

Front 6

Examples of console use are:

Back 6

The initial configuration of the network device
Disaster recovery procedures and troubleshooting where remote access is not possible
Password recovery procedures

Front 7

To access the CLI via Telnet requires:

Back 7

ctive networking services on the device. The network device must have at least one active interface configured with a Layer 3 address

Front 8

A more secure method of remote access is:

Back 8

Secure Shell (SSH) protocol

Front 9

To establish a remote session via telephone:

Back 9

via a telephone dialup connection using a modem connected to the router's AUX port

Front 10

A Cisco network device contains two configuration files:

Back 10

The running configuration file - used during the current operation of the device
The startup configuration file - used as the backup configuration and is loaded when the device is started

Front 11

The CLI uses a hierarchical structure for the modes.

In order from top to bottom, the major modes are:

Back 11

User executive mode
Privileged executive mode
Global configuration mode
Other specific configuration modes

Front 12

The two primary modes of operation are:

Back 12

USER Exec and Privileged EXEC

Front 13

Moving between the User EXEC and Privileged EXEC Modes

Back 13

The enable and disable commands are used to change the CLI between the user EXEC mode and the privileged EXEC mode, respectively.

Front 14

The IOS has several forms of help available

Back 14

Context-sensitive help
Command Syntax Check
Hot Keys and Shortcuts

Front 15

The context-sensitive help provides

Back 15

a list of commands and the arguments associated with those commands within the context of the current mode.

Front 16

To access context-sensitive help

Back 16

enter a question mark, ?, at any prompt

Front 17

There are three different types of error messages:

Back 17

Ambiguous command
Incomplete command
Incorrect command

Front 18

The figure shows most of the shortcuts. The following are worthy of special note:

Back 18

Tab - Completes the remainder of the command or keyword
Ctrl-R - Redisplays a line
Ctrl-Z - Exits configuration mode and returns to the EXEC
Down Arrow - Allows user to scroll forward through former commands
Up Arrow - Allows user to scroll backward through former commands
Ctrl-Shift-6 - Allows the user to interrupt an IOS process such as ping or traceroute
Ctrl-C - Aborts the current command and exits the configuration mode

Front 19

To view the statistics for a specific interface

Back 19

enter the show interfaces command followed by the specific interface slot/port number.

Front 20

Displays the ARP table of the device

Back 20

show arp -

Front 21

(switch only) Displays the MAC table of a switch.

Back 21

show mac-address-table -

Front 22

Displays the saved configuration located in NVRAM.

Back 22

show startup-config -

Front 23

Displays the contents of the currently running configuration file or the configuration for a specific interface, or map class information.

Back 23

show running-config -

Front 24

Displays IPv4 statistics for all interfaces on a router.

Back 24

show ip interfaces -

Front 25

The primary configuration mode is called

Back 25

global configuration or global config

Front 26

The following CLI command is used to take the device from privileged EXEC mode to the global configuration mode and to allow entry of configuration commands from a terminal:

Back 26

Router#configure terminal

Front 27

From the global config mode, there are many different configuration modes that may be entered. Each of these modes allows the configuration of a particular part or function of the IOS device. The list below shows a few of them:

Back 27

Interface mode - to configure one of the network interfaces (Fa0/0, S0/0/0,..)
Line mode - to configure one of the lines (physical or virtual) (console, AUX, VTY,..)
Router mode - to configure the parameters for one of the routing protocols

Front 28

To leave configuration mode completely and return to privileged EXEC mode

Back 28

enter end or use the key sequence Ctrl-Z.

Front 29

Once a change has been made from the global mode, it is good practice

Back 29

to save it to the startup configuration file stored in NVRAM

Front 30

The command to save the running configuration to startup configuration file is:

Back 30

Router#copy running-config startup-config

Front 31

Some guidelines for naming conventions are that names should:

Back 31

Start with a letter
Not contain a space
End with a letter or digit
Have characters of only letters, digits, and dashes
Be 63 characters or fewer

Front 32

Configure IOS Hostname

Back 32

From the privileged EXEC mode, access the global configuration mode by entering the configure terminal command:
n the global mode, enter the hostname:

Router(config)#hostname AtlantaHQ

Front 33

The passwords introduced here are

Back 33

Console password - limits device access using the console connection
Enable password - limits access to the privileged EXEC mode
Enable secret password - encrypted, limits access to the privileged EXEC mode
VTY password - limits device access using Telnet

Front 34

The following commands are used in global configuration mode to set a password for the console line:

Back 34

Switch(config)#line console 0
Switch(config-line)#password password
Switch(config-line)#login

Front 35

The following commands are used to set the passwords:

Back 35

Router(config)#enable password password
Router(config)#enable secret password

Front 36

The following commands are used to set a password on vty lines:

Back 36

Router(config)#line vty 0 4
Router(config-line)#password password
Router(config-line)#login

Front 37

Another useful command prevents passwords from showing up as plain text when viewing the configuration files.

Back 37

This is the service password-encryption command.

Front 38

To configure a MOTD, from global configuration mode enter the

Back 38

banner motd command:

Switch(config)#banner motd # message #

Front 39

After making changes to a configuration, consider these options for the next step:

Back 39

Make the changed configuration the new startup configuration.
Return the device to its original configuration.
Remove all configuration from the device.

Front 40

Make the Changed Configuration the New Startup Configuration

Back 40

use the copy running-config startup-config command at the privileged EXEC mode prompt. The following example shows the command:

Switch#copy running-config startup-config

Front 41

we can replace the running configuration with the startup configuration. This is best done by

Back 41

restarting the device using the reload command at the privileged EXEC mode prompt.

Front 42

Configuration files can be stored on a

Back 42

Trivial File Transfer Protocol (TFTP) server

Front 43

one option is to save the running configuration or the startup configuration to a TFTP server

Back 43

1. Enter the copy running-config tftp command.

2. Enter the IP address of the host where the configuration file will be stored.

3. Enter the name to assign to the configuration file.

4. Press Enter to confirm each choice.

Front 44

To erase the startup configuration file use

Back 44

erase NVRAM:startup-config or erase startup-config at the privileged EXEC mode prompt:

Front 45

To configure an Ethernet interface follow these steps:

Back 45

1. Enter global configuration mode.

2. Enter interface configuration mode.

3. Specify the interface address and subnet mask.

4. Enable the interface.

Front 46

configure the Ethernet IP address using the following commands:

Back 46

Router(config)#interface FastEthernet 0/0
Router(config-if)#ip address ip_address netmask
Router(config-if)#no shutdown

Front 47

By default, interfaces are disabled. To enable an interface

Back 47

enter the no shutdown command from the interface configuration mode.

Front 48

To configure a serial interface follow these steps:

Back 48

1. Enter global configuration mode.

2. Enter interface mode.

3. Specify the interface address and subnet mask.

4. Set the clock rate if a DCE cable is connected. Skip this step if a DTE cable is connected.

5. Turn on the interface.

Front 49

Each connected serial interface must have an IP address and subnet mask to route IP packets.

Configure the IP address with the following commands:

Back 49

Router(config)#interface Serial 0/0/0
Router(config-if)#ip address ip_address netmask

Front 50

the commands that are used to set a clock rate and enable a serial interface are:

Back 50

Router(config)#interface Serial 0/0/0
Router(config-if)#clock rate 56000
Router(config-if)#no shutdown

Front 51

The interface description will appear in the output of these commands:

Back 51

show startup-config, show running-config, and show interfaces.