Which of the following statements are TRUE about manually configured IPV4-to-IP6 tunnels and GRE tunnels? (Choose two.)
A. Manually configured tunnels use the tunnel mode ipv6ip command, while GRE tunnels use the tunnel mode gre ip command.
B. Manually configured tunnels support IPv6 IGPs, while GRE tunnels do not.
C. Manually configured tunnels block IPv6 multicasts, while GRE forwards them.
D. Manually configured tunnels do not support multiple passenger protocols, while GRE tunnels support them.
Explanation:
The following statements are TRUE about manually configured tunnels and GRE tunnels:
• Manually configured tunnels use the tunnel mode ipv6ip command, while GRE tunnels use the tunnel mode gre ip command.
• Manually configured tunnels do not support multiple passenger protocols, while GRE tunnels support them.
Manually configured tunnels and Generic Routing Encapsulation (GRE) tunnels are static point-to-point tunneling methods. Both of these tunneling methods provide a permanent link between two IPv6 networks that are separated by an IPv4 backbone. For each link between two IPv6 networks, a separate tunnel needs to be created.
Manually configured tunnels use a particular passenger protocol and do not support multiple passenger protocols at the same time. However, GRE tunnels can simultaneously use various passenger protocols.
It is incorrect to state that manually configured tunnels support IPv6 IGPs, while GRE tunnels do not. GRE tunnels also support IPv6 IGPs, such as OSPF, RIP, and IS-IS.
It is incorrect to state that manually configured tunnels block IPv6 multicasts, while GRE forwards them. Manually configured tunnels also forward IPv6 multicasts.
Objective:
Network Principles
Sub-Objective:
Recognize proposed changes to the network