Ultimate Flashcards

On a switch, debugging is enabled. For instance, I wish to debug the IP ICMP packet switch. Debugging would end if I would

Answer: All of the above

To stop debugging on a Cisco switch, you have several effective options. Typing `no debug ip icmp` specifically disables the ICMP debugging. `undebug all` or `no debug all` disables all active debugging sessions. Additionally, reloading the switch will clear its running configuration, including any active debug commands, effectively ending all debugging.

In order to return to the SETUP MODE or the ORIGINAL CONFIGURATION MODE,

Answer: Type setup under PRIVILEDGE mode

To re-enter the initial setup mode on a Cisco device, you must be in privileged EXEC mode (indicated by the `#` prompt). From there, typing the `setup` command will launch the initial configuration dialog, allowing you to configure basic device settings as if it were a new device. This is useful for re-configuring fundamental parameters or reviewing initial setup options.

(3) instructions to clear the NVRAM's data.

Answer: Write erase

All three commands—`write erase`, `erase startup-config`, and `erase nvram:`—effectively clear the startup configuration stored in Non-Volatile RAM (NVRAM) on a Cisco device. `write erase` is a legacy command, while `erase startup-config` is a more explicit and modern command for the same purpose. `erase nvram:` directly targets the NVRAM file system to remove the startup configuration, often done to reset a device to its factory default settings.

This advances the cursor in the command that is now being displayed without deleting any characters.

Answer: Left arrow or Ctr-B

In the Cisco IOS command-line interface, the left arrow key or the Ctrl-B key combination moves the cursor one character to the left. This allows you to navigate backward within the current command line to make edits or review input without deleting any characters, providing precise cursor control.

This progresses 1 word.

Answer: Esc-F

In the Cisco IOS command-line interface, the Esc-F key combination (Escape key followed by 'F') moves the cursor forward one word at a time. This is a useful shortcut for quickly navigating through longer commands to reach a specific point for editing or reviewing input more efficiently than moving character by character.

Makes progress 1 word.

Answer: Esc-F

In Cisco IOS CLI, `Esc-F` is a keyboard shortcut used to move the cursor forward one word at a time. This command is part of the command-line editing features, allowing users to navigate and modify commands more efficiently than moving character by character. It helps in quickly jumping across words within a command string.

Change the status of the DUPLX (duplex) LED. Choose the appropriate response(s) for the matching hue and description.

Answer: LED is green means full duplex

On Cisco switches, the DUPLX (duplex) LED indicates the operational duplex mode of a port. A solid green LED signifies that the port is operating in full-duplex mode, enabling simultaneous two-way communication. If the DUPLX LED is off, it means the port is not in full-duplex, indicating either half-duplex operation or no active link.

How many vty lines can Cisco switches support at the moment?

Answer: 16

Cisco switches typically support a range of Virtual Teletype (VTY) lines, with 0 to 15 being a common default, totaling 16 lines. These VTY lines are used for remote access sessions, such as Telnet or SSH, allowing multiple administrators to manage the switch concurrently from different locations. The number can vary by model, but 16 is a standard default for many Catalyst switches.

The overall system state is implied by the switch status from LED to SYST (system). The switch is not powered on if the light is off. If the light is on, the switch is activated and working (Cisco IOS has been loaded). What happens if the light is ON but the color is AMBER?

Answer: POST failed and Cisco IOS did not load

The SYST (system) LED on a Cisco switch provides a visual indication of the switch's overall health. If this LED is solid amber, it signifies that the Power-On Self-Test (POST) has failed. This indicates a hardware issue during startup, preventing the Cisco IOS operating system from loading successfully and rendering the switch inoperable.

New adjustments are made whenever you alter settings in CONFIGURATION mode.

Answer: Only saved in RAM

When you make configuration changes in Cisco IOS's CONFIGURATION mode, these adjustments are initially saved only in the device's volatile Random Access Memory (RAM). This means the running configuration is updated and active immediately. However, these changes are temporary and will be lost if the device reboots or loses power, unless explicitly saved to NVRAM.

Change the PORT LED's status on the LED. Choose the appropriate response(s) for the matching hue and description.

Answer: OFF - The link is not working

The PORT LED on a Cisco switch indicates the status of an individual port. If the LED is OFF, it signifies that there is no active link on that port, meaning the link is not working or the cable is disconnected. A flashing AMBER LED typically indicates that the port is administratively disabled, in a fault state, or blocked by Spanning Tree Protocol (STP) to prevent network loops.

After making changes to settings on a switch in CONFIGURATION mode, only the most recent modifications will be implemented.

Answer: After you type copy running startup and reboot the switch

After making configuration changes in CONFIGURATION mode, they are active in the running configuration (RAM). To make these changes permanent and ensure they persist after a reboot, you must first save them to NVRAM using the `copy running-config startup-config` command. Subsequently, a reboot is often required for certain critical configuration changes to be fully applied and take effect from the newly saved startup configuration.

Switch>? The command above will

Answer: List only available commands in the USER mode

In Cisco IOS CLI, typing `?` at the command prompt provides context-sensitive help. When you are in USER EXEC mode (indicated by the `Switch>` prompt), using `?` will display a list of all commands that are available and can be executed within that specific privilege level. This helps users discover valid commands for their current mode.

This shows the most recent command used. If you touch it once more, the most recent command in the history buffer will appear.

Answer: Up arrow or CTRL-P

The `Up arrow` key (or `Ctrl-P`) in Cisco IOS CLI is used to recall previously entered commands from the history buffer. Each press of the `Up arrow` key cycles backward through the command history, displaying the most recent command first and then older commands. This feature greatly enhances efficiency by allowing users to quickly re-execute or edit past commands.

Each end of the rolled (rollover or console) cable that links a PC to a console port on a Cisco switch connects to either a PC or the console port. What belongs to what?

Answer: RJ-45 interface goes to the console while the serial interface goes to the PC

A Cisco console cable, often called a rollover cable, is used to connect a PC to a switch's console port for initial configuration and out-of-band management. The RJ-45 connector end of this cable plugs into the console port on the Cisco switch. The serial interface (typically a DB-9 connector) on the other end connects to the serial port (COM port) of the PC.

A Cisco switch is extremely secure out of the box by design because it.

Answer: Only allows console access

Out of the box, a new Cisco switch is designed with security in mind by only allowing console access. It typically has no IP address configured and no remote access protocols like Telnet or SSH enabled or secured. This ensures that an administrator must physically connect to the device via the console port to perform initial setup and configure network access and security.