Cisco Networking Chapter 2 (Configuring A Network Operating System)

Front 1

What is Telnet?

Back 1

Telnet is a method for remotely establishing a CLI session of a device, through a virtual interface, over a network.

Telnet sessions require active networking services on a device and must have at least one active interface configured with an Internet address such as an IP4 address.

Front 2

What is SSH?

Back 2

The Secure Shell (SSH) protocol provides a remote login similar to Telnet, except that it uses more secure network services. SSH provides stronger password authentication than Telnet and uses encryption when transporting session data. This keeps the user ID, password, and the details of the management session private. As a best practice, use SSH instead of Telnet whenever possible.

Front 3

What is AUX?

Back 3

An older way to establish a CLI session remotely is via a telephone dialup connection using a modem connected to the auxiliary (AUX) port of a router, which is highlighted in the figure. Similar to the console connection, the AUX method is also an out-of-band connection and does not require any networking services to be configured or available on the device. In the event that network services have failed, it may be possible for a remote administrator to access the switch or router over a telephone line.

Front 4

What terminal emulation programs are available for connecting to a networking device by a seriel connection over console or Telnet or SSH?

Back 4

Putty

"Tera" term

SecureCRT

Hyper Terminal

OS X Terminal

These programs allow you to enhance productivity by adjusting window sizes, changing font sizes and changing colour schemes.

Front 5

Access methods test

Back 5

Front 6

Configuring a Cisco device

Back 6

From basic to most specialised modes:

User executive (USER EXEC) mode

Privileged executive (Privileged EXEC) mode

Global confirmation mode

Other specific configuration modes, such as interface configuration.

Front 7

I.O.S Hierarchical structure

Back 7

Front 8

User EXEC mode

Back 8

The user EXEC mode has limited capabilities but is useful for some basic operations. The user EXEC mode is at the most basic level of the modal hierarchical structure. This mode is the first mode encountered upon entrance into the CLI of an IOS device.The user EXEC mode allows only a limited number of basic monitoring commands. This is often referred to as view-only mode. The user EXEC level does not allow the execution of any commands that might change the configuration of the device.By default, there is no authentication required to access the user EXEC mode from the console. However, it is a good practice to ensure that authentication is configured during the initial configuration.The user EXEC mode is identified by the CLI prompt that ends with the > symbol. This is an example that shows the > symbol in the prompt:Switch>

Front 9

Privileged EXEC Mode

Back 9

The execution of configuration and management commands requires that the network administrator use the privileged EXEC mode or a more specific mode in the hierarchy. This means that a user must enter user EXEC mode first, and from there, access privileged EXEC mode.The privileged EXEC mode can be identified by the prompt ending with the # symbol.Switch#By default, privileged EXEC mode does not require authentication. It is a good practice to ensure that authentication is configured.

Front 10

User EXEC mode vs Privileged EXEC mode

Back 10

Front 11

Global Configuration mode

Back 11

The primary configuration mode is called global configuration or global config. From global configuration mode, CLI configuration changes are made that affect the operation of the device as a whole. The global configuration mode is accessed before accessing specific configuration modes.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:Switch# configure terminal

Front 12

Moving between the User EXEC and privileged EXEC Modes

Back 12

Front 13

Name two Specific Configuration Modes

Back 13

Interface mode - to configure one of the network interfaces (Fa0/0, S0/0/0)

Line mode - to configure one of the physical or virtual lines (console, AUX, VTY)

Front 14

What command is used to enter line configuration mode for the console?

Back 14

line console 0