100-140 Question 233
Select 3A network administrator is troubleshooting connectivity issues on an IPv6 network. They decide to use Traceroute6 to identify the path packets take to a destination. However, the output shows 'Request timed out' for several hops. What could be the potential causes of this issue?
- A
Intermediate routers are configured to block ICMPv6 Time Exceeded messages.
- B
The destination device is unreachable due to incorrect IPv6 addressing.
- C
Traceroute6 requires elevated permissions, and the command was run without proper privileges.
- D
Firewalls along the path are blocking ICMPv6 traffic.
- E
Traceroute6 does not support IPv6 and is incompatible with the network.
Show answer and explanation
Correct answers: A, B, D
Explanation
Traceroute6 is a tool used to trace the path packets take to a destination in an IPv6 network. 'Request timed out' messages in its output often occur due to routers blocking ICMPv6 Time Exceeded messages, firewalls blocking ICMPv6 traffic, or the destination being unreachable. Understanding these causes helps in diagnosing and resolving IPv6 connectivity issues effectively.
- A. Correct.
This is correct. If intermediate routers block ICMPv6 Time Exceeded messages, Traceroute6 cannot display hop details, leading to 'Request timed out' messages.
- B. Correct.
This is correct. If the destination device is unreachable due to an incorrect IPv6 address, some hops may still respond, but the destination will not be reached.
- C. Incorrect.
This is incorrect. While elevated permissions may be required on some systems, this would prevent the command from running entirely, not cause 'Request timed out' for specific hops.
- D. Correct.
This is correct. Firewalls blocking ICMPv6 traffic can prevent the responses required for Traceroute6 to complete successfully.
- E. Incorrect.
This is incorrect. Traceroute6 is specifically designed for IPv6 networks, so it is fully compatible with IPv6.