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Questions and Answers
What command is used to display the ARP table of the router?
What command is used to display the ARP table of the router?
- show interface
- show arp-table
- display arp
- show ip arp (correct)
What is the purpose of the 'service password-encryption' command in router configuration?
What is the purpose of the 'service password-encryption' command in router configuration?
- Changes the service password for router access
- Displays passwords in plain text
- Encrypts all passwords that are configured on the router (correct)
- Decrypts encrypted passwords on the router
In the context of configuring a serial interface, what does the 'clock rate' command do?
In the context of configuring a serial interface, what does the 'clock rate' command do?
- Adjusts the interface speed
- Syncs the clock with a server
- Defines the clock rate for serial communication (correct)
- Sets the clock time for the router
Which command is used to display the saved configuration located in NVRAM?
Which command is used to display the saved configuration located in NVRAM?
What does CDP stand for in networking and what is its purpose?
What does CDP stand for in networking and what is its purpose?
How can you create a backup copy of the router's configuration?
How can you create a backup copy of the router's configuration?
What is the purpose of the 'service password-encryption' command on a Cisco router?
What is the purpose of the 'service password-encryption' command on a Cisco router?
Which command is used to display the current configuration in a Cisco router?
Which command is used to display the current configuration in a Cisco router?
What is the fastest way to restore an IOS image to a router from ROMmon mode?
What is the fastest way to restore an IOS image to a router from ROMmon mode?
How can you check the environment variables set in the ROMmon environment?
How can you check the environment variables set in the ROMmon environment?
What is the purpose of the 'service password-encryption' command in router configuration?
What is the purpose of the 'service password-encryption' command in router configuration?
What is the purpose of the VTY port on a router?
What is the purpose of the VTY port on a router?
When configuring a router, what is the key difference between 'enable password' and 'enable secret' commands?
When configuring a router, what is the key difference between 'enable password' and 'enable secret' commands?
What type of information does the 'show interfaces serial 0/1' command provide in a router?
What type of information does the 'show interfaces serial 0/1' command provide in a router?
Which command displays a history of commands that have been entered on a router?
Which command displays a history of commands that have been entered on a router?
Explain the difference between the 'enable password' and 'enable secret' commands when configuring a router for security.
Explain the difference between the 'enable password' and 'enable secret' commands when configuring a router for security.
What is the significance of the VTY port on a router and how is it used in network configuration?
What is the significance of the VTY port on a router and how is it used in network configuration?
How can you display the current running configuration of a Cisco router, and why is it important to know this information?
How can you display the current running configuration of a Cisco router, and why is it important to know this information?
Explain the purpose of the 'clock rate' command in the context of configuring a serial interface on a router.
Explain the purpose of the 'clock rate' command in the context of configuring a serial interface on a router.
What command is used to display the saved configuration located in NVRAM on a Cisco router, and why is it important to know this information?
What command is used to display the saved configuration located in NVRAM on a Cisco router, and why is it important to know this information?
Study Notes
CLI Command Modes
- Two commands used to restrict access to privileged EXEC mode:
enable passwordandenable secret enable password: passwords shown in clear text in configuration filesenable secret: uses strong MD5 algorithm for encryption
Configuring Router Passwords
service password-encryption: applies weak encryption to all unencrypted passwords- VTY (Virtual Teletype): a virtual port used for Telnet or SSH access to the device
- VTY solely used for inbound connections to the device
Examining Show Commands
show interfaces: displays statistics for all interfaces on a routershow clock: shows the time set in the routershow hosts: displays a cached list of host names and addressesshow users: displays all users who are connected to the routershow history: displays a history of commands that have been enteredshow flash: displays information about flash memory and what IOS files are stored thereshow version: displays information about the currently loaded software version along with hardware and device information
Configuring Serial and Ethernet Interfaces
interface serial 0/0: configures a serial interfaceclock rate 56000: sets the clock rate for the serial interfaceno shutdown: enables the serial interfaceinterface Ethernet 0/0: configures an Ethernet interface
Managing Configuration Files
copyandpastecan be used to create a backup copy of the configurationshow running-config: displays the contents of the currently running configuration filetftpcan be used to manage configuration files- Environmental variables can be set to download an IOS image from a TFTP server using the
tftpdnldcommand
Cisco Discovery Protocol (CDP)
- CDP is used to obtain information about neighboring Cisco devices
- CDP Version 2 (CDPv2) is the most recent release of the protocol
- CDP operates at the data link layer and allows two systems to learn about each other, even if they use different network layer protocols
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Description
Learn about configuring a router using CLI commands, password protection, and encryption methods. Understand the differences between 'enable password' and 'enable secret', as well as how to use 'service password-encryption' for added security.
