Verify Layer 3 Path to a Host | Cisco Router Command

Verify Layer 3 Path to a Host

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Question

Which command would you use on a Cisco router to verify the Layer 3 path to a host?

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Explanations

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A. B. C. D.

B

The correct command to verify the Layer 3 path to a host on a Cisco router is "traceroute address" (Option B).

The "traceroute" command is used to trace the Layer 3 path that packets take from the source device to the destination device. When a packet is sent from the source device to the destination device, it passes through multiple routers and switches before reaching its destination. The "traceroute" command helps to identify the routers and switches that the packet passes through.

Here's how the "traceroute" command works:

  1. The source device sends a packet with a Time-to-Live (TTL) value of 1 to the destination device.

  2. The first router that receives the packet decrements the TTL value by 1 and sends an ICMP Time Exceeded message back to the source device.

  3. The source device receives the ICMP Time Exceeded message and notes the IP address of the router that sent the message.

  4. The source device sends another packet with a TTL value of 2 to the destination device.

  5. The second router that receives the packet decrements the TTL value by 1 and sends an ICMP Time Exceeded message back to the source device.

  6. The source device receives the ICMP Time Exceeded message and notes the IP address of the second router.

  7. This process repeats until the packet reaches the destination device.

The output of the "traceroute" command provides the IP addresses of the routers that the packet passed through and the time it took for each router to respond.

Therefore, option B - traceroute address is the correct command to verify the Layer 3 path to a host on a Cisco router.

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