CompTIA Network+ Practice Test

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Prepare for the CompTIA Network+ Exam. Utilize interactive quizzes and multiple-choice questions with explanations. Boost your readiness and achieve exam success now!

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What is the result of using TTL=1 in a traceroute?

It pings the destination device
It represents the first router on the path
It signifies a successful delivery
It ends the traceroute process

The correct answer is: It represents the first router on the path

Using a Time to Live (TTL) value of 1 in a traceroute is significant because it only allows the packet to reach the first router on the path to the destination. When the packet with TTL set to 1 is sent, it travels to the first router. If that router receives the packet and sees that the TTL has reached 0 (the initial value of 1 diminishes by 1 upon passing through the router), it will not forward the packet any further. Instead, it will discard the packet and send an ICMP "Time Exceeded" message back to the source. This mechanism allows the traceroute utility to identify the first hop in the network path to the destination. By incrementing the TTL on subsequent traceroute requests, each router along the path can be discovered until the packet either reaches its destination or is discarded by a router with no further hops available.