Networking Week 12: Switch Configurations

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Questions and Answers

What does a blinking amber LED light indicate on a switch?

  • The device is functioning normally
  • PoE is denied due to power limitations (correct)
  • The switch is starting up
  • Power is being supplied correctly

What should be done first when accessing a Cisco Catalyst 2960 switch?

  • Install the device's firmware
  • Run the system configuration dialog
  • Connect the rollover cable to the console port (correct)
  • Configure the IP address

What is the baud rate setting commonly used for Cisco switches?

  • 4800
  • 9600 (correct)
  • 115200
  • 19200

What happens if no configuration is found on the switch during startup?

<p>The system configuration dialog is initiated (A)</p> Signup and view all the answers

To establish a terminal session for CLI access on the switch, which of these programs can be used?

<p>HyperTerminal (D)</p> Signup and view all the answers

What is the expected outcome of the switch bootup process after power is applied?

<p>Flash is validated before loading the IOS (B)</p> Signup and view all the answers

Which command line configuration step is essential before making any changes to the switch?

<p>Connect to the console via Terminal (B)</p> Signup and view all the answers

In the context of a switch booting up, what does 'IOS' stand for?

<p>Internetwork Operating System (B)</p> Signup and view all the answers

What is the purpose of the VTY lines on a switch?

<p>To provide remote access to the switch (B)</p> Signup and view all the answers

What command is used to configure a password for the console line?

<p>line console 0 (C)</p> Signup and view all the answers

Why should Privileged EXEC mode be password protected?

<p>To prevent unauthorized access and configuration changes (A)</p> Signup and view all the answers

Which command is used to set the enable secret password?

<p>enable secret Top$ecretPrivEXECpassWORD (A)</p> Signup and view all the answers

What is the main disadvantage of using Telnet for remote access?

<p>Data is transmitted in plaintext (A)</p> Signup and view all the answers

Which of the following commands exits the VTY configuration mode?

<p>exit (A)</p> Signup and view all the answers

How many VTY lines are configured on the switch?

<p>16 (A)</p> Signup and view all the answers

What does SSH provide for managing network devices?

<p>Remote access with encryption (B)</p> Signup and view all the answers

What command is used to generate RSA keys for enabling SSH?

<p>crypto key generate rsa (B)</p> Signup and view all the answers

What is the valid range for the key modulus size when generating RSA keys?

<p>360 to 2048 (C)</p> Signup and view all the answers

Which command is used to set the SSH version to be used?

<p>ip ssh version 2 (C)</p> Signup and view all the answers

What command should be used to check local users' database for user authentication?

<p>login local (B)</p> Signup and view all the answers

To create a VLAN and assign a name, which command sequence should be used?

<p>vlan 2 name Registrar (C)</p> Signup and view all the answers

What is the first step in setting up specific VTY lines for SSH access?

<p>QCUSwitch(config)#line vty 0 5 (C)</p> Signup and view all the answers

What command is used to add ports to a VLAN after creation?

<p>configure access ports for vlan (A)</p> Signup and view all the answers

Which of the following commands enables SSH and shows a confirmation message?

<p>*Mar 4 7:4:9.374: %SSH-5-ENABLED: SSH 1.99 has been enabled (D)</p> Signup and view all the answers

Flashcards

VTY lines

Virtual Terminal lines used for remote access to a device (like a switch).

VTY range (0-15)

The specified range of VTY lines to configure on a switch.

Password protection of VTY

Securing access to virtual terminal lines by setting passwords.

Console line

A physical or virtual connection to a device's command prompt allowing direct, local interaction.

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Console line password

A password set for local console access.

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Privileged EXEC mode

A higher-level mode in a network device's command line interface (CLI) granting more commands and access to configuration.

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Enable secret (for Privileged EXEC)

A powerful password protecting access to Privileged EXEC mode within the switch, more secure than standard passwords.

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SSH

Secure Shell, a cryptographic network protocol for securely accessing a remote device’s command line interface over a network.

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Enabling SSH on a switch

SSH (Secure Shell) is a network protocol that allows secure remote login to a device over a network. Enabling SSH on a switch allows remote access via a secure connection.

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SSH key generation

Generating RSA keys is the first step when enabling SSH. It creates a secure key pair for authenticating connections.

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Key modulus size

The key modulus is the size of the key used in cryptographic operations during SSH sessions. Larger sizes offer stronger security but can take longer to generate.

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SSH version 2

SSH version 2 is a more secure and newer version of the SSH protocol compared to previous versions, offering enhanced security and features.

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Transport input SSH

This command configures a VTY line to accept SSH connections.

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VLAN creation

VLANs (Virtual LANs) logically segment a network into smaller, isolated broadcast domains. VLANs improve network security and performance.

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Assigning ports to VLANs

This command configures ports of a network to be assigned to a specific VLAN for controlling data communication.

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PoE Denied LED

Alternating green and amber LED indicates insufficient power for the device.

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PoE Unavailable

Blinking amber LED signals a fault preventing power delivery.

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Switch Boot Process

Sequence of actions when powering on, validating flash, locating, uncompressing, and loading the Inter-networking Operating System (IOS).

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System Configuration Dialog

Script prompts to set basic switch configuration if no prior settings exist.

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Console Port

Serial port of the switch used for initial configuration access.

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Terminal Emulation

Software to connect to a computer's console, allowing interaction via command-line interface.

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Baud rate 9600

The speed at which data transmits between the computer and the switch during initial console connection.

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Basic Switch Config

Initial setup of a switch, which involves connecting to the console

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Study Notes

Week 12: Initial Switch Configuration

  • Learning Outcomes: Familiarize with Cisco 2960 series switches, perform initial switch configuration, understand commands used in switch configuration.

Cisco Catalyst 2960 Series Switches

  • Intelligent Ethernet switches, new family of fixed-configuration standalone devices.
  • Provide 10/100 Fast Ethernet and 10/100/1000 Gigabit Ethernet connectivity.
  • Enable enhanced LAN services for entry-level enterprise, mid-market, and branch office networks.

Switch Configurations (Specific Part Numbers)

  • WS-C2960-24TT-L: 24 Ethernet 10/100 ports, 2 10/100/1000 TX uplinks, rack unit (RU), multilayer switch, Entry-level.
  • WS-C2960-48TT-L: 48 Ethernet 10/100 ports, 2 10/100/1000 TX uplinks, rack unit (RU), multilayer switch, Entry-level.
  • WS-C2960-24TC-L: 24 Ethernet 10/100 ports, 4 dual-purpose uplinks (1 10/100/1000 Ethernet port + 1 SFP Gigabit Ethernet port per uplink), rack unit (RU), multilayer switch, Entry-level.
  • WS-C2960-48TC-L: 48 Ethernet 10/100 ports, 4 dual-purpose uplinks (1 10/100/1000 Ethernet port + 1 SFP Gigabit Ethernet port per uplink), rack unit (RU), multilayer switch, Entry-level.
  • WS-C2960G-24TC-L: 24 Ethernet 10/100/1000 ports, 4 dual-purpose uplinks (1 10/100/1000 Ethernet port + 1 SFP Gigabit Ethernet port per uplink), rack unit (RU), multilayer switch, Entry-level.

Switch LEDs

  • System LED: Indicates switch connection to power source. Green light confirms power and proper functioning.
  • Redundant Power System (RPS) LED: Shows RPS status. Green light = RPS running. Flashing green = providing power to another device. Amber light = standby mode. Blinking amber = RPS failure.
  • Port Status LED: Shows port status mode (default green = active). Green LED indicates data transmission/reception. Amber = link fault/port blocked, completely off = no link. Alternating green/amber = link fault.
  • Port Duplex LED: Indicates port duplex mode. Green light = full-duplex.
  • Port Speed LED: Indicates port operating speed. No LED = 10 Mb/s. Green=100 Mb/s. Blinking green = 1000 Mb/s
  • Power over Ethernet (PoE) Mode: Green LED = PoE is activated. Alternating green/amber = PoE is being denied. Blinking amber = PoE is unavailable.

System Configuration Dialog

  • If no configuration is found, the IOS runs the setup script (System Configuration Dialog).
  • The script asks questions to help configure the switch.

Boot Loader

  • Connect rollover cable to switch's console port and computer's COM port.
  • Use a terminal emulation program (e.g., HyperTerminal, Tera Term, PuTTY) to view CLI output.
  • The switch's boot process involves validating the flash and loading the IOS.

IP Address and Default Gateway

  • Use the command-line interface
  • Enter commands: switch#configure terminal, switch(config)#interface Vlan1, switch(config-if)#ip address 192.168.0.254 255.255.255.0, no shutdown, exit, ip default-gateway 192.168.0.1, end

Basic Switch Configuration (CLI)

  • Step 1: Connect to the console. Many Cisco switches use serial settings: Baud Rate: 9600, Data bits: 8, Stop bits: 1, Parity: None.
  • Step 2: Set management IP and default gateway. Enter the desired IP address and subnet mask values.
  • Step 3: Set hostname and domain name. Use hostname command in global configuration mode to set a logical hostname. Use ip domain-name command in global configuration mode to set a domain name.
  • Step 4: Set logins for VTY lines and console port. Configure strong passwords for all virtual terminal lines (VTY lines 0-15) and for the console port (line console 0).
  • Step 5: Set Privileged EXEC password. Password protect the privileged EXEC mode (enable secret).
  • Step 6: Enable SSH.switch(config)#ip ssh version 2
  • Step 7: Configure Trunk ports
  • Step 8: Add access ports to VLAN
  • Step 9: Configure trunk ports (if needed)
  • Step 10: Save configuration. Use copy running-config startup-config command to save config to startup config file.

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Related Documents

Week 12 Initial Switch Configuration PDF

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