Which two IPv6 tunnel types support only point-to-point communication? (Choose two.)
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A. B. C. D.AD.
The two IPv6 tunnel types that support only point-to-point communication are:
Manually configured tunnels are point-to-point tunnels that are manually configured between two IPv6 routers. These tunnels are created by configuring an IPv6 address on the tunnel interfaces of the two routers, and then configuring the IPv6 routing protocol to use the tunnel interface as the next-hop to reach the remote network. Manually configured tunnels are not scalable and are typically used for testing or for connecting isolated IPv6 networks.
Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) tunnels are also point-to-point tunnels that are used to connect IPv6 hosts or networks over an IPv4 infrastructure. ISATAP tunnels are automatically configured using the IPv4 addresses of the participating hosts and an IPv6-in-IPv4 encapsulation method. The ISATAP tunnel endpoint is a router or a host that has both IPv4 and IPv6 capabilities. ISATAP tunnels are not scalable and are typically used in small, isolated environments.
The other two tunnel types mentioned, automatic 6to4 and GRE, are not limited to point-to-point communication:
Automatic 6to4 is a tunneling technique that enables IPv6 traffic to be transmitted over an IPv4 network without manual configuration. Automatic 6to4 tunnels are typically used to connect IPv6 networks that are not directly connected to each other. These tunnels are not limited to point-to-point communication and can support point-to-multipoint or multipoint-to-multipoint communication.
Generic Routing Encapsulation (GRE) is a tunneling protocol that enables the encapsulation of various network layer protocols, including IPv6, over an IP network. GRE tunnels are not limited to point-to-point communication and can support point-to-multipoint or multipoint-to-multipoint communication. GRE tunnels are often used in conjunction with other protocols, such as IPsec, to create secure VPN connections.