tcptraceroute is used for what?

• A. A protocol for routing control
• B. A DNS lookup utility
• C. It is a network diagnostic tool used to trace the path packets take to a network host
• D. An email filtering utility

Answer: (C)

tcptraceroute is a network diagnostic tool used to trace the path packets take to a network host. It works by sending TCP probes to a chosen port (often 80 or 443) and observing the responses from each router along the route, revealing each hop and the latency encountered. This approach helps map the actual path even when ICMP packets are blocked by firewalls, making it especially useful for diagnosing routing issues, identifying where delays occur, and testing firewall rules that affect TCP traffic.