200-301 Question 94
Select 3You are configuring IPv6 addressing on a router interface. The network administrator has assigned you the IPv6 prefix 2001:db8:abcd::/64 for the segment. You configure the IPv6 address 2001:db8:abcd::1/64 on the interface. After configuration, you verify connectivity using the 'ping' command to another device in the same subnet, but it fails. Which of the following steps would help resolve the issue?
- A
Ensure the interface is enabled with the 'no shutdown' command.
- B
Verify that the other device is configured with an IPv6 address from the same subnet.
- C
Check for a valid link-local address on the router interface.
- D
Enable IPv6 routing globally using the 'ipv6 unicast-routing' command.
- E
Configure a default gateway on the router.
Show answer and explanation
Correct answers: A, B, D
Explanation
To resolve the issue, ensure the interface is active (using 'no shutdown'), verify that both devices are in the same IPv6 subnet, and confirm that IPv6 routing is enabled on the router. These steps ensure that the basic IPv6 configuration is complete and operational. A link-local address and default gateway are not directly relevant to this specific scenario.
- A. Correct.
The 'no shutdown' command is required to enable the interface and bring it up. If the interface is administratively down, no communication will occur.
- B. Correct.
Both devices need to be in the same subnet to communicate. Ensure the second device has an address in the 2001:db8:abcd::/64 range.
- C. Incorrect.
A link-local address is automatically assigned in IPv6 and is necessary for local communication, but this is not directly related to the issue of subnet configuration.
- D. Correct.
Enabling 'ipv6 unicast-routing' is necessary for the router to forward IPv6 packets. Without this, IPv6 communication might fail even on directly connected networks.
- E. Incorrect.
A default gateway is not required for devices to communicate within the same subnet. It is used for communication with devices outside the local network.