Q6. Which of the following is true about IP trace command?
A. The trace command discovers the path taken to reach the destination by sending out a probe datagram with TTL value of 1 and then incrementing the TTL value in steps of 1.
B. The trace command discovers the path taken to reach the destination by pinging each node along the path by its IP address.
C. The trace command discovers the path taken to reach the destination by pinging each node along the path by its host name.
D. The route a packet takes to reach its destination can not be established.
Correct Answer: A
The trace command discovers the path taken to reach its final destination by sending out probe datagrams. The first datagram is sent out with a TTL (Time To Live) value of just 1. This causes the first router to discard the packet and send back 'time exceeded' message. Thus the first router enroute is discovered! Then, the TTL is incremented by 1 (now TTL is 2) and the datagram is sent out again. Now the second router enroute discards the packet as the TTL reached zero, and sends back 'time exceeded' message to the source. This process is repeated till the destination is reached. By doing so, the exact path that a packet takes to reach the destination is established.
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