Cisco Networking/CCENT/IOS Basics

Objectives and Skills edit

Objectives and skills for the IOS basics portion of Cisco CCENT certification include:^[1]

Configure and verify utilizing the CLI to set basic Router configuration
- Hostname
- banner
- motd
- Local user & password
- Enable secret password
- Console logins
- exec-timeout
- service password encryption
- copy run start

Readings edit

Multimedia edit

Examples edit

Global Configuration edit

enable edit

To enter privileged EXEC mode, or any other security level set by a system administrator, use the enable EXEC command.^[2]

enable

disable edit

To exit privileged EXEC mode and return to user EXEC mode, or to exit to a lower privilege level, enter the disable EXEC command.^[3]

disable

configure terminal edit

To enter global configuration mode, use the configure terminal command in privileged EXEC mode.^[4]

configure terminal

exit edit

To exit any configuration mode to the next highest mode in the CLI mode hierarchy, use the exit command in any configuration mode. To close an active terminal session by logging off the router, use the exit command in EXEC mode.^[5]^[6]

exit

hostname edit

To specify or modify the hostname for the network server, use the hostname command in global configuration mode.^[7]

hostname <name>

ip domain-name edit

To configure the domain name server (DNS) domain name, use the ip domain-name command in global configuration mode.^[8]

ip domain-name <domain-name>

banner login edit

To define and enable a customized banner to be displayed before the username and password login prompts, use the banner login global configuration command.^[9]

banner login #<message>#

banner motd edit

To define and enable a message-of-the-day (MOTD) banner, use the banner motd global configuration command.^[10]

banner motd #<message>#

Command Sequence edit

A global configuration command sequence to enable privileged EXEC mode, enter global configuration mode, specify a hostname and banner messages, exit global configuration mode, disable privileged EXEC mode, and log off the router is:

enable
configure terminal
hostname router
ip domain-name example.com
banner login #Authorized users only!#
banner motd #System maintenance will occur on Friday!#
exit
disable
exit

Password Configuration edit

line edit

To identify a specific line for configuration and enter line configuration collection mode, use the line command in global configuration mode.^[11]

line console 0

password edit

To specify a password on a line, use the password command in line configuration mode.^[12]

password <password>

login edit

To enable password checking at login, use the login command in line configuration mode.^[13]

login

username edit

To establish a username-based authentication system, use the username command in global configuration mode.^[14]

username <name> password <password>

login local edit

To enable username and password checking at login, use the login local command in line configuration mode.^[15]

login local

exec-timeout edit

To set the interval that the EXEC command interpreter waits until user input is detected, use the exec-timeout line configuration command.^[16]

exec-timeout <minutes>

enable password edit

To set a local clear-text password to control access to various privilege levels, use the enable password command in global configuration mode.^[17]

enable password <password>

enable secret edit

To specify an additional layer of security over the enable password command, use the enable secret command in global configuration mode.^[18]

enable secret <password>

service password-encryption edit

To encrypt passwords, use the service password-encryption command in global configuration mode.^[19]

service password-encryption

Command Sequence edit

A command sequence to configure passwords might be similar to the following.

enable
configure terminal

line console 0
password letmein
login
exit

enable secret cisco
service password-encryption
exit

show running-config
exit

A command sequence to configure usernames and passwords might be similar to the following.

enable
configure terminal

username admin1 password secret1
username admin2 password secret2

line console 0
login local
exit

enable secret cisco
service password-encryption
exit

show running-config
exit

Configuration Management edit

show running-config edit

To display the contents of the current running configuration file or the configuration for a specific module, Layer 2 VLAN, class map, interface, map class, policy map, or virtual circuit (VC) class, use the show running-config command in privileged EXEC mode.^[20]

show running-config
show run

show startup-config edit

The show startup-config command displays the startup configuration file contained in NVRAM or specified by the CONFIG_FILE environment variable.^[21]

show startup-config
show start

copy edit

To copy any file from a source to a destination, use the copy command in privileged EXEC or diagnostic mode.^[22]

copy <source> <destination>
copy running-config startup-config
copy run start

erase edit

To erase a file system or all files available on a file system, use the erase command in privileged EXEC or diagnostic mode.^[23]

erase {/all nvram: | file-system: | startup-config}
erase startup-config

reload edit

To reload the operating system, use the reload command in privileged EXEC or diagnostic mode.^[24]

reload

Command Sequence edit

A command sequence to manage device configuration might be similar to the following.

enable
show run
copy run start
show start
reload

Activities edit

Connect to a Cisco router and practice using IOS commands.
1. Review TechRepublic: 10 Commands You Should Master When Working with the Cisco IOS.
2. Add a router to a new GNS3 project and start the device.
3. Open the console for the router and practice using the following commands.
  - ?
  - show running-config
  - show interface
  - show ip interface
  - show ip interface brief
  - show ip route
  - show version
Configure a router hostname, banner login, and banner motd messages.
1. Add a router to a new GNS3 project and start the device.
2. Open the console for the router and practice using the following commands.
  - enable
  - configure terminal
  - hostname
  - banner login
  - banner motd
  - exit
3. Exit the router console session and open the console again to test the configuration.
Configure router console password security.
1. Add a router to a new GNS3 project and start the device.
2. Open the console for the router and practice using the following commands.
  - enable
  - configure terminal
  - line console 0
  - password
  - login
  - exec-timeout
  - enable secret
  - service password-encryption
  - exit
3. Verify the configuration using the following command.
  - show running-config
4. Exit the router console session and open the console again to test the configuration.
Configure router console username and password security.
1. Add a router to a new GNS3 project and start the device.
2. Open the console for the router and practice using the following commands.
  - enable
  - configure terminal
  - username
  - line console 0
  - login local
  - exec-timeout
  - enable secret
  - service password-encryption
  - exit
3. Verify the configuration using the following command.
  - show running-config
4. Exit the router console session and open the console again to test the configuration.
Manage router configuration.
1. Use one or more of the router configurations above and manage the configuration using the following commands.
  - enable
  - show running-config
  - copy running-config startup-config
  - show startup-config
  - reload
2. After restarting the router, verify the configuration using the following command.
  - show running-config
3. Clear the router configuration using the following commands.
  - erase startup-config
  - reload
4. After restarting the router, verify the configuration using the following command.
  - show running-config

Lesson Summary edit

Cisco IOS (originally Internetwork Operating System) is software used on most Cisco Systems routers and network switches.^[25]
IOS is a package of routing, switching, internetworking and telecommunications functions integrated into a multitasking operating system.^[26]
Cisco IOS command modes determine the commands and privilege level of the current user.^[27]
User EXEC mode allows connection to remote devices, changing terminal settings on a temporary basis, performing basic tests, and listing system information. User EXEC mode is indicated by a Router> prompt.^[28]
Privileged EXEC mode allows all EXEC commands available on the system. Privileged EXEC mode is indicated by a Router# prompt.^[29]
Global Configuration mode commands allow configuration of the system as a whole, and access to specific configuration modes and submodes. Global Configuration mode is indicated by a Router(config)# prompt.^[30]
ROM Monitor mode is used for system diagnostics or when a valid system image is not found. ROM Monitor mode is indicated by a rommon1> prompt.^[31]
Setup mode is an interactive sequence that allows first-time configuration of devices.^[32]
More than 100 detail configuration modes and submodes are available for different interfaces and protocols.^[33]
Almost every configuration command also has a no form used to disable the feature or function.^[34]
Context-sensitive help is available by entering ? in any command mode.^[35]
To enter privileged EXEC mode, or any other security level set by a system administrator, use the enable EXEC command.^[36]
To exit privileged EXEC mode and return to user EXEC mode, or to exit to a lower privilege level, enter the disable EXEC command.^[37]
To enter global configuration mode, use the configure terminal command in privileged EXEC mode.^[38]
To exit any configuration mode to the next highest mode in the CLI mode hierarchy, use the exit command in any configuration mode.^[39]
To close an active terminal session by logging off the router, use the exit command in EXEC mode.^[40]
To specify or modify the hostname for the network server, use the hostname command in global configuration mode.^[41]
To configure the domain name server (DNS) domain name, use the ip domain-name command in global configuration mode.^[42]
To define and enable a customized banner to be displayed before the username and password login prompts, use the banner login global configuration command.^[43]
To define and enable a message-of-the-day (MOTD) banner, use the banner motd global configuration command.^[44]
To identify a specific line for configuration and enter line configuration collection mode, use the line command in global configuration mode.^[45]
To specify a password on a line, use the password command in line configuration mode.^[46]
To enable password checking at login, use the login command in line configuration mode.^[47]
To establish a username-based authentication system, use the username command in global configuration mode.^[48]
To enable username and password checking at login, use the login local command in line configuration mode.^[49]
To set the interval that the EXEC command interpreter waits until user input is detected, use the exec-timeout line configuration command.^[50]
To set a local clear-text password to control access to various privilege levels, use the enable password command in global configuration mode.^[51]
To specify an additional layer of security over the enable password command, use the enable secret command in global configuration mode.^[52]
To encrypt passwords, use the service password-encryption command in global configuration mode.^[53]
To display the contents of the current running configuration file or the configuration for a specific module, Layer 2 VLAN, class map, interface, map class, policy map, or virtual circuit (VC) class, use the show running-config command in privileged EXEC mode.^[54]
The show startup-config command displays the startup configuration file contained in NVRAM or specified by the CONFIG_FILE environment variable.^[55]
To copy any file from a source to a destination, use the copy command in privileged EXEC or diagnostic mode.^[56]
To erase a file system or all files available on a file system, use the erase command in privileged EXEC or diagnostic mode.^[57]
To reload the operating system, use the reload command in privileged EXEC or diagnostic mode.^[58]

Key Terms edit

command-line interface (CLI): A means of interacting with a computer program where the user issues commands to the program in the form of successive lines of text.^[59]
configuration mode: Allows commands that apply to the system as a whole, accessed using the configure command.^[60]
console: The text entry and display interface for system administration messages.^[61]
enable mode: Privileged EXEC mode, accessed using the enable command.^[62]
host name: A label assigned to a device connected to a computer network and used to identify the device in various forms of electronic communication.^[63]
IOS image: A Cisco system software file used to run Cisco routers and switches.^[64]
local username: Usernames and passwords stored on the local device using the login local and username commands.^[65]
running config file: The current system configuration, stored in RAM.^[66]
startup config file: The current system boot configuration, stored in NVRAM.^[67]
user mode: User EXEC mode, accessed by logging into a device.^[68]

Review Questions edit

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Cisco IOS (originally _____) is _____.

Cisco IOS (originally Internetwork Operating System) is software used on most Cisco Systems routers and network switches.
IOS is _____.

IOS is a package of routing, switching, internetworking and telecommunications functions integrated into a multitasking operating system.
Cisco IOS command modes _____.

Cisco IOS command modes determine the commands and privilege level of the current user.
User EXEC mode _____.

User EXEC mode allows connection to remote devices, changing terminal settings on a temporary basis, performing basic tests, and listing system information.
User EXEC mode is indicated by _____.

User EXEC mode is indicated by a Router> prompt.
Privileged EXEC mode _____.

Privileged EXEC mode allows all EXEC commands available on the system.
Privileged EXEC mode is indicated by _____.

Privileged EXEC mode is indicated by a Router# prompt.
Global Configuration mode commands _____.

Global Configuration mode commands allow configuration of the system as a whole, and access to specific configuration modes and submodes.
Global Configuration mode is indicated by _____.

Global Configuration mode is indicated by a Router(config)# prompt.
ROM Monitor mode is used for _____.

ROM Monitor mode is used for system diagnostics or when a valid system image is not found.
ROM Monitor mode is indicated by _____.

ROM Monitor mode is indicated by a rommon1> prompt.
Setup mode is _____.

Setup mode is an interactive sequence that allows first-time configuration of devices.
More than 100 detail configuration modes and submodes are available for _____.

More than 100 detail configuration modes and submodes are available for different interfaces and protocols.
Almost every configuration command also has _____ used to disable the feature or function.

Almost every configuration command also has a no form used to disable the feature or function.
Context-sensitive help is available by _____.

Context-sensitive help is available by entering ? in any command mode.
To enter privileged EXEC mode, or any other security level set by a system administrator, use _____.

To enter privileged EXEC mode, or any other security level set by a system administrator, use the enable EXEC command.
To exit privileged EXEC mode and return to user EXEC mode, or to exit to a lower privilege level, use _____.

To exit privileged EXEC mode and return to user EXEC mode, or to exit to a lower privilege level, use the disable EXEC command.
To enter global configuration mode, use _____.

To enter global configuration mode, use the configure terminal command in privileged EXEC mode.
To exit any configuration mode to the next highest mode in the CLI mode hierarchy, use _____.

To exit any configuration mode to the next highest mode in the CLI mode hierarchy, use the exit command in any configuration mode.
To close an active terminal session by logging off the router, use _____.

To close an active terminal session by logging off the router, use the exit command in EXEC mode.
To specify or modify the hostname for the network server, use _____.

To specify or modify the hostname for the network server, use the hostname command in global configuration mode.
To configure the domain name server (DNS) domain name, use _____.

To configure the domain name server (DNS) domain name, use the ip domain-name command in global configuration mode.
To define and enable a customized banner to be displayed before the username and password login prompts, use _____.

To define and enable a customized banner to be displayed before the username and password login prompts, use the banner login global configuration command.
To define and enable a message-of-the-day (MOTD) banner, use _____.

To define and enable a message-of-the-day (MOTD) banner, use the banner motd global configuration command.
To identify a specific line for configuration and enter line configuration collection mode, use _____.

To identify a specific line for configuration and enter line configuration collection mode, use the line command in global configuration mode.
To specify a password on a line, use _____.

To specify a password on a line, use the password command in line configuration mode.
To enable password checking at login, use _____.

To enable password checking at login, use the login command in line configuration mode.
To establish a username-based authentication system, use _____.

To establish a username-based authentication system, use the username command in global configuration mode.
To enable username and password checking at login, use _____.

To enable username and password checking at login, use the login local command in line configuration mode.
To set the interval that the EXEC command interpreter waits until user input is detected, use _____.

To set the interval that the EXEC command interpreter waits until user input is detected, use the exec-timeout line configuration command.
To set a local clear-text password to control access to various privilege levels, use _____.

To set a local clear-text password to control access to various privilege levels, use the enable password command in global configuration mode.
To specify an additional layer of security over the enable password command, use _____.

To specify an additional layer of security over the enable password command, use the enable secret command in global configuration mode.
To encrypt passwords, use _____.

To encrypt passwords, use the service password-encryption command in global configuration mode.
To display the contents of the current running configuration file or the configuration for a specific module, Layer 2 VLAN, class map, interface, map class, policy map, or virtual circuit (VC) class, use _____.

To display the contents of the current running configuration file or the configuration for a specific module, Layer 2 VLAN, class map, interface, map class, policy map, or virtual circuit (VC) class, use the show running-config command in privileged EXEC mode.
The show startup-config command _____.

The show startup-config command displays the startup configuration file contained in NVRAM or specified by the CONFIG_FILE environment variable.
To copy any file from a source to a destination, use _____.

To copy any file from a source to a destination, use the copy command in privileged EXEC or diagnostic mode.
To erase a file system or all files available on a file system, use _____.

To erase a file system or all files available on a file system, use the erase command in privileged EXEC or diagnostic mode.
To reload the operating system, use _____.

To reload the operating system, use the reload command in privileged EXEC or diagnostic mode.

Assessments edit

Flashcards: Quizlet: CCENT - IOS Basics
Quiz: Quizlet: CCENT - Lab Setup

References edit

← Lab Setup

Cisco Networking/CCENT

Remote Management →

[1] Cisco: ICND1 Exam Topics

[2] Cisco: Basic Command-Line Interface Commands

[3] Cisco: Basic Command-Line Interface Commands

[4] Cisco: IOS Configuration Fundamentals Command Reference

[5] Cisco: IOS Configuration Fundamentals Command Reference

[6] Cisco: IOS Configuration Fundamentals Command Reference

[7] Cisco: IOS Configuration Fundamentals Command Reference

[8] Cisco: Unity Express 2.0 Command Reference

[9] Cisco: IOS Configuration Fundamentals Command Reference

[10] Cisco: IOS Configuration Fundamentals Command Reference

[11] Cisco: Cisco IOS Terminal Services Command Reference

[12] Cisco: Passwords and Privileges

[13] Cisco IOS Terminal Services Command Reference

[14] Cisco: Passwords and Privileges Commands

[15] Cisco: Telnet, Console and AUX Port Passwords on Cisco Routers Configuration Example

[16] Cisco: IOS Configuration Fundamentals Command Reference

[17] Cisco: Passwords and Privileges Commands

[18] Cisco: Passwords and Privileges Commands

[19] Cisco: Passwords and Privileges Commands

[20] Cisco: IOS Configuration Fundamentals Command Reference

[21] Cisco: IOS Configuration Fundamentals Command Reference

[22] Cisco: IOS Configuration Fundamentals Command Reference

[23] Cisco: IOS Configuration Fundamentals Command Reference

[24] Cisco: IOS Configuration Fundamentals Command Reference

[25] Wikipedia: Cisco IOS

[26] Wikipedia: Cisco IOS

[27] Wikipedia: Cisco IOS

[28] Cisco: IOS Command Modes

[29] Cisco: IOS Command Modes

[30] Cisco: IOS Command Modes

[31] Cisco: IOS Command Modes

[32] Cisco: IOS Command Modes

[33] Cisco: IOS Command Modes

[34] Cisco: IOS and Configuration Basics

[35] Cisco: IOS and Configuration Basics

[36] Cisco: Basic Command-Line Interface Commands

[37] Cisco: Basic Command-Line Interface Commands

[38] Cisco: IOS Configuration Fundamentals Command Reference

[39] Cisco: IOS Configuration Fundamentals Command Reference

[40] Cisco: IOS Configuration Fundamentals Command Reference

[41] Cisco: IOS Configuration Fundamentals Command Reference

[42] Cisco: Unity Express 2.0 Command Reference

[43] Cisco: IOS Configuration Fundamentals Command Reference

[44] Cisco: IOS Configuration Fundamentals Command Reference

[45] Cisco: Cisco IOS Terminal Services Command Reference

[46] Cisco: Passwords and Privileges

[47] Cisco IOS Terminal Services Command Reference

[48] Cisco: Passwords and Privileges Commands

[49] Cisco: Telnet, Console and AUX Port Passwords on Cisco Routers Configuration Example

[50] Cisco: IOS Configuration Fundamentals Command Reference

[51] Cisco: Passwords and Privileges Commands

[52] Cisco: Passwords and Privileges Commands

[53] Cisco: Passwords and Privileges Commands

[54] Cisco: IOS Configuration Fundamentals Command Reference

[55] Cisco: IOS Configuration Fundamentals Command Reference

[56] Cisco: IOS Configuration Fundamentals Command Reference

[57] Cisco: IOS Configuration Fundamentals Command Reference

[58] Cisco: IOS Configuration Fundamentals Command Reference

[59] Wikipedia: Command-line interface

[60] Cisco: IOS Command Reference

[61] Wikipedia: System console

[62] Cisco: IOS Command Reference

[63] Wikipedia: Hostname

[64] Wikipedia: Cisco IOS

[65] Cisco: Telnet, Console and AUX Port Passwords on Cisco Routers Configuration Example

[66] Cisco: IOS and Configuration Basics

[67] Cisco: IOS and Configuration Basics

[68] Cisco: IOS and Configuration Basics

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Cisco Networking/CCENT/IOS Basics

Objectives and Skills edit

Readings edit

Multimedia edit

Examples edit

Global Configuration edit

enable edit

disable edit

configure terminal edit

exit edit

hostname edit

ip domain-name edit

banner login edit

banner motd edit

Command Sequence edit

Password Configuration edit

line edit

password edit

login edit

username edit

login local edit

exec-timeout edit

enable password edit

enable secret edit

service password-encryption edit

Command Sequence edit

Configuration Management edit

show running-config edit

show startup-config edit

copy edit

erase edit

reload edit

Command Sequence edit

Activities edit

Lesson Summary edit

Key Terms edit

Review Questions edit

Assessments edit

See Also edit

References edit