Which of the following statements is TRUE concerning a 6to4 tunnel?
A. The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41.
B. The 6to4 tunnel method includes a 20-byte IPv6 header with no options and an IPv4 payload.
C. The maximum transmission unit is increased by 20 octets with the 6to4 tunnel method.
D. The IPv6 packet has its header removed and replaced with an IPv4 header with the 6to4 tunnel method.
Explanation:
When an IPv6 packet is tunneled across a portion of the network that does not support IPv6, the IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41. When it reaches the other end of the tunnel, the IPv4 portion is stripped off and the packet is routed the rest of the way by using the remaining IPv6 header.
This method does not include a 20-byte IPv6 header with no options and an IPv4 payload. On the contrary, it includes a 20-byte IPv4 header with no options and an IPv6 payload.
The maximum transmission unit is not increased by 20 octets with this method. Rather, it is decreased by 20 bytes due to the extra overhead.
The IPv6 packet does not have its header removed and replaced with an IPv4 header. It encapsulates the entire IPv6 packet within an IPv4 header.
Objective:
Network Principles
Sub-Objective:
Recognize proposed changes to the network