350-401 Question 72
Single answerA network engineer notices sub-optimal routing and high CPU utilization on a router. Upon investigation, it is determined that the router is not using hardware-level switching. Which switching mechanism should be enabled to ensure faster packet forwarding using a pre-built forwarding table?
- A
Control Plane Policing (CoPP)
- B
Forwarding Information Base (FIB)
- C
Routing Information Base (RIB)
- D
Content Addressable Memory (CAM)
Show answer and explanation
Correct answer: B
Explanation
The Forwarding Information Base (FIB) is a hardware-level mechanism derived from the Routing Information Base (RIB) to accelerate packet forwarding. By enabling FIB, the router can perform lookups and forward packets using hardware, significantly reducing CPU utilization and improving performance.
- A. Incorrect.
Control Plane Policing (CoPP) is a mechanism used to protect the control plane from excessive traffic and does not directly affect packet forwarding performance.
- B. Correct.
Forwarding Information Base (FIB) is a hardware-switching mechanism that stores pre-computed forwarding information, enabling faster packet forwarding in routers.
- C. Incorrect.
Routing Information Base (RIB) is a software-based routing table used by the control plane to compute routing decisions but is not used directly for high-speed packet forwarding.
- D. Incorrect.
Content Addressable Memory (CAM) is used for MAC address lookups in switches and is not directly related to IP packet forwarding in routers.