What is an OSPF transit network?

What is an OSPF transit network?

• A. Network that uses tunnels to connect two areas
• B. Network that connects two different areas
• C. A network on which a router discovers at least one neighbor
• D. A network that connects to a different routing protocol

Answer: (A)

In OSPF, a transit network is the path that carries routing information between areas by interconnecting area border routers (ABRs) and other backbone-connected routers. It serves as the inter-area conduit, often realized over a WAN link or tunnel that links different areas through the backbone. That’s why describing a transit network as one that uses tunnels to connect two areas aligns with its purpose: the network’s job is to bridge separate areas and enable OSPF to flood LSAs and form adjacencies across them via the backbone. In practice, this inter-area path can be implemented with tunnels or other WAN links, not just within a single area. The idea that a transit network merely connects two areas is incomplete because transit networks can span more than two areas, and their defining role is to carry inter-area routing through the backbone, rather than being confined to a single-area connection or a different routing protocol.

In OSPF, a transit network is the path that carries routing information between areas by interconnecting area border routers (ABRs) and other backbone-connected routers. It serves as the inter-area conduit, often realized over a WAN link or tunnel that links different areas through the backbone.

That’s why describing a transit network as one that uses tunnels to connect two areas aligns with its purpose: the network’s job is to bridge separate areas and enable OSPF to flood LSAs and form adjacencies across them via the backbone. In practice, this inter-area path can be implemented with tunnels or other WAN links, not just within a single area.

The idea that a transit network merely connects two areas is incomplete because transit networks can span more than two areas, and their defining role is to carry inter-area routing through the backbone, rather than being confined to a single-area connection or a different routing protocol.