An automatic IPv4-compatible IPv6 tunnel exists between two IPv6 networks. The two IPv6 networks belong to different BGP autonomous systems (AS). The tunnel source has the IPv4 address 172.168.111.65/24 and the tunnel destination has the IPv4 address 172.168.222.80/24.
Which of the following statements is TRUE about the tunnel source and tunnel destination IPv6 addresses? (Choose two.)
A. the IPv6 address of the tunnel source is 172.168.111.65::
B. the IPv6 address of the tunnel source is ::172.168.111.65
C. the IPv6 address of the tunnel destination is 172.168.222.80::
D. the IPv6 address of the tunnel destination is ::172.168.222.80
Explanation:
The IPv6 address of the tunnel source is ::172.168.111.65 and the IPv6 address of the tunnel destination is ::172.168.222.80. These two addresses are IPv4-compatible IPv6 addresses, which are addresses that contain the IPv4 addresses of the tunnel source and destination.
In automatic IPv4-compatible IPv6 tunnel, the IPv4 addresses of the tunnel source and the tunnel destination are used to determine their IPv6 addresses. The IPv4 addresses of the tunnel source/destination are embedded into the least significant 32 bits of an all-zero unicast IPv6 address. The resultant IPv6 address has zeros in the most significant 96 bits and the IPv4 address of the tunnel source/destination in the remaining 32 bits.
In this case, the source of an automatic IPv4-compatible IPv6 tunnel has the IPv6 address 0:0:0:0:0:0:172.168.111.65, abbreviated as ::2.168.111.65. You can also convert this address into pure hexadecimal format, which would be ACA8:6F41.
Any of the following three addresses could be used to identify the BGP neighbor at 172.168.11.65:
0:0:0:0:0:0:172.168.111.65
::172.168.111.65
::ACA8:6F41
Similarly, the tunnel destination has the IPv6 address 0:0:0:0:0:0:172.168.222.80 (abbreviated as ::172.168.222.80). The hexadecimal form of the IPv6 address of the tunnel destination is ::ACA8:DE50.
Any of the following three addresses could be used to identify the BGP neighbor at 172.168.222.80:
0:0:0:0:0:0:172.168.222.80
::172.168.222.80
::ACA8:DE50
The other two options state incorrect IPv6 addresses of the tunnel source and the tunnel destination. Both options specify an IPv6 address that has the IPv4 address of the tunnel source/destination in the most significant 32 bits and zeros in the least significant 96 bits.
Objective:
Network Principles
Sub-Objective:
Recognize proposed changes to the network