What is traceroute used for?

• A. Determining the path and measuring transit delays to a destination across an IP network.
• B. Diagnosing hardware failures unrelated to networks.
• C. Compressing data for transmission.
• D. Assigning IP addresses to devices.

Answer: (A)

Traceroute is used to determine the path packets take to a destination and to measure the transit delays between each hop along that path. It accomplishes this by sending probe packets with gradually increasing TTL values. When a router discards a packet because its TTL has expired, it sends back an ICMP Time Exceeded message, revealing the router’s address. By collecting these responses, you get a hop-by-hop map of the route and the round-trip times to each hop. This makes traceroute a powerful tool for troubleshooting network paths, confirming routing behavior, and pinpointing where latency or failures occur. Keep in mind that some networks block or rate-limit ICMP responses, so not every hop may appear, and different paths can exist due to load balancing. It isn’t used for diagnosing hardware failures unrelated to networks, compressing data, or assigning IP addresses.