Which Interface Names are Used for GRE and IP-IP Tunnels?

AC

GRE interfaces are notated as gr; IP-IP interfaces are notated as ip.

The correct answers are A. gr-1/2/0.0 and B. gre-1/2/0.0.

In Junos OS, GRE and IP-IP tunnels are used to establish a virtual point-to-point connection between two remote networks over an existing network infrastructure. To reference these tunnels within the Junos OS, two interface names can be used:

1. gr-1/2/0.0: This interface name is used to reference a Generic Routing Encapsulation (GRE) tunnel. GRE is a tunneling protocol that encapsulates one network protocol (such as IPv4) within another network protocol (such as IPv4 or IPv6) to create a virtual point-to-point connection between two remote networks.

2. gre-1/2/0.0: This interface name is also used to reference a GRE tunnel. However, this naming convention is not commonly used in the Junos OS.

3. ip-2/3/0.0: This interface name is not used to reference an IP-IP tunnel in the Junos OS. Instead, it follows the naming convention for a regular interface and represents a logical interface with the IP protocol running over it.

4. ipip-2/3/0.0: This interface name is not used to reference an IP-IP tunnel in the Junos OS. It is also not commonly used in the Junos OS.

In summary, the correct interface names used within the Junos OS to reference GRE or IP-IP tunnels are gr-1/2/0.0 and gre-1/2/0.0.