## Automatic 6-to-4 tunnels exist between dual-stack routers (A, B, and C). One router has the IPv6 address, 2002:D030:6BC0:173C::26:37D0/48Which of the following addresses is the IPv4 address of the router with the IPv6 address 2002:D030:6BC0:173C::26:37D0/48?

Last Updated on July 31, 2021 by Admin 1

### Automatic 6-to-4 tunnels exist between dual-stack routers (A, B, and C). One router has the IPv6 address, 2002:D030:6BC0:173C::26:37D0/48Which of the following addresses is the IPv4 address of the router with the IPv6 address 2002:D030:6BC0:173C::26:37D0/48?

• 10.176.15.131
• 10.200.80.67
• 208.48.107.192
• 208.138.16.110
Explanation:

The IPv4 address of the IPv6 router is 208.48.107.192. In an automatic 6-to-4 tunnel, IPv6 addresses have the 2002::/16 prefix. The 32-bit IPv4 address of the IPv6 router is then embedded into the IPv6 address. The 32 bits of the IPv4 address is embedded in the second and third quartet of the IPv6 address. The second and third quarters in the IPv6 address correspond to D030:6BC0. The conversion of these hexadecimal digits into decimal is given as follows:

The IPv6 router does not have 10.176.15.131 as its IPv4 address. The 10.176.15.131 address is the IPv4 equivalent of the second and third quarter (05B0:0F81) in the source IPv6 address.

The other two IPv4 addresses are incorrect as they pertain to neither of the two IPv6 hosts.

Objective:
Network Principles
Sub-Objective:
Recognize proposed changes to the network