Configuring OSPF Command for Area 0 Inclusion

A

The correct answer is A. "network 0.0.0.0 255.255.255.255 area 0"

Explanation:

OSPF (Open Shortest Path First) is a link-state routing protocol used in large-scale enterprise networks. It uses Dijkstra's algorithm to calculate the shortest path between routers, and then propagates the routing information to other routers within the same OSPF area.

To configure OSPF on a router, you must specify the OSPF routing process and the networks that will participate in OSPF. The "network" command is used to specify the network address and wildcard mask of the networks that will participate in OSPF.

In this question, we want to include all interfaces of the router into OSPF area 0. To do this, we need to use the network command with the wildcard mask of 0.0.0.0, which means that all bits in the network address are significant. The correct command is:

network 0.0.0.0 255.255.255.255 area 0

This command tells the router to include all interfaces that have an IP address within the range of 0.0.0.0 to 255.255.255.255 in OSPF area 0. The wildcard mask of 255.255.255.255 means that all bits in the IP address are significant, so all interfaces of the router will be included in OSPF.

Option B, "network 0.0.0.0 0.0.0.0 area 0", is not correct because the wildcard mask of 0.0.0.0 means that no bits in the IP address are significant, which is invalid.

Option C, "network 255.255.255.255 0.0.0.0 area 0", is also incorrect because the network address of 255.255.255.255 is the broadcast address, which is not a valid network address.

Option D, "network all-interfaces area 0", is not a valid command in OSPF configuration.