In which dynamic routing protocol do all links have a default metric cost of 10?

The correct answer is based on the characteristics of the IS-IS (Intermediate System to Intermediate System) routing protocol. In IS-IS, by default, all links are assigned a metric cost of 10. This baseline metric allows for a straightforward configuration where all connections are treated similarly unless explicitly modified by an administrator. The protocol operates using a link-state approach, meaning it builds a complete topology to determine the best paths to destinations in a network.

IS-IS is often favored in larger networks or service provider environments due to its ability to scale and its robustness in link-state routing. The default metric helps facilitate the initial routing decisions as the network administrator can adjust the metrics as needed based on the network design requirements.

In contrast, other dynamic routing protocols have different default behaviors. For instance, RIP (Routing Information Protocol) employs a maximum hop count metric, calculated based on the number of hops, with the default considered to be 1 for directly connected routes. OSPF (Open Shortest Path First) utilizes a more complex calculation based on cost, which is usually derived from bandwidth rather than a fixed value. EIGRP (Enhanced Interior Gateway Routing Protocol) employs both a default bandwidth metric and another metric consisting of delay, reliability, load, and