How does a router manage static routing when Cisco Express Forwarding is disabled?

How does a router manage static routing when Cisco Express Forwarding is disabled?

• A. It requires only the outgoing interface to be specified
• B. It requires fully specified static routes to avoid routing inconsistencies
• C. It automatically adjusts routes based on traffic
• D. It cannot handle static routing in any form

Answer: (B)

When Cisco Express Forwarding (CEF) is disabled, the router must manage routing decisions using a different mechanism. In this scenario, the necessity for fully specified static routes is paramount. Each static route must include information about both the next-hop IP address and the outgoing interface. This specification ensures that the routing table is complete and clear, preventing any routing inconsistencies that could arise from ambiguous route definitions. By requiring fully specified static routes, the router can accurately determine where to forward packets without relying on the efficiency and advanced features provided by CEF. This approach is vital in maintaining predictable and reliable routing behavior, especially in cases where the router must make forwarding decisions based purely on the static routes defined in its configuration. In contrast, options that suggest reduced requirements or automated adjustments fail to address the inherent complexities involved in static routing management when CEF is inactive, leading to potential routing errors or inefficiencies.

When Cisco Express Forwarding (CEF) is disabled, the router must manage routing decisions using a different mechanism. In this scenario, the necessity for fully specified static routes is paramount. Each static route must include information about both the next-hop IP address and the outgoing interface. This specification ensures that the routing table is complete and clear, preventing any routing inconsistencies that could arise from ambiguous route definitions.

By requiring fully specified static routes, the router can accurately determine where to forward packets without relying on the efficiency and advanced features provided by CEF. This approach is vital in maintaining predictable and reliable routing behavior, especially in cases where the router must make forwarding decisions based purely on the static routes defined in its configuration.

In contrast, options that suggest reduced requirements or automated adjustments fail to address the inherent complexities involved in static routing management when CEF is inactive, leading to potential routing errors or inefficiencies.