Traceroute
Traceroute is a network diagnostic tool used to trace the path that an IP packet takes from a source to a destination across an IP network, displaying the series of routers (hops) it passes through. It works by sending packets with incrementally increasing Time-To-Live (TTL) values and analyzing the ICMP Time Exceeded messages returned by intermediate routers. This helps identify network latency, routing issues, and connectivity problems between two points on a network.
Developers should learn and use Traceroute when troubleshooting network connectivity issues, such as diagnosing slow connections, identifying packet loss points, or verifying routing paths in distributed systems or cloud environments. It is essential for DevOps engineers, network administrators, and backend developers working with microservices or APIs to pinpoint where network failures occur, especially in complex infrastructures involving multiple servers or data centers.