200-301 Question 96
Select 3You are configuring an IPv6 network for a small branch office. The ISP has provided you with the IPv6 prefix 2001:db8:abcd:1000::/56. You need to assign a /64 subnet to a specific VLAN within the branch (VLAN 10). Which of the following IPv6 addresses can be used as a valid host address in the subnet assigned to VLAN 10?
- A
2001:db8:abcd:1000::1
- B
2001:db8:abcd:1000:ffff:ffff:ffff:ffff
- C
2001:db8:abcd:10::1
- D
2001:db8:abcd:1001::1
- E
2001:db8:abcd:1000:0:0:0:1234
Show answer and explanation
Correct answers: A, B, E
Explanation
To determine valid IPv6 host addresses, you need to identify the correct subnet range. The ISP provided a /56 prefix, and you are assigning a /64 subnet for VLAN 10. The subnet 2001:db8:abcd:1000::/64 includes all addresses from 2001:db8:abcd:1000:: to 2001:db8:abcd:1000:ffff:ffff:ffff:ffff. Any address outside this range would belong to a different subnet. By analyzing the options, addresses 1, 2, and 5 fall within this range, making them valid host addresses for the subnet.
- A. Correct.
This is a valid IPv6 address within the subnet 2001:db8:abcd:1000::/64. It is in the correct range for the first /64 subnet of the /56 prefix.
- B. Correct.
This is the last valid IPv6 address in the subnet 2001:db8:abcd:1000::/64. It is within the correct range.
- C. Incorrect.
This address is invalid because it belongs to a different subnet (2001:db8:abcd:10::/64) and does not match the assigned /64 subnet.
- D. Incorrect.
This address is invalid because it belongs to a different subnet (2001:db8:abcd:1001::/64) and does not match the assigned /64 subnet.
- E. Correct.
This is a valid IPv6 address within the subnet 2001:db8:abcd:1000::/64. It falls within the correct range for this subnet.