What function does BFD provide?
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Correct answer: It provides uniform failure detection regardless of media type.
Why this is the answer
Bidirectional Forwarding Detection (BFD) is a lightweight, low-overhead protocol designed to detect failures in the forwarding path between two adjacent network devices. Its primary function is to provide rapid and uniform failure detection for various network protocols, including routing protocols like OSPF, EIGRP, and BGP, as well as MPLS. BFD is independent of the media type and the data protocols, meaning it can detect failures across different link types (e.g., Ethernet, Frame Relay, ATM) and for any encapsulated protocol. This independence allows for consistent and fast fault detection across diverse network infrastructures. The other options are incorrect: BFD is designed to be lightweight, not to cause high CPU utilization. It provides uniform detection regardless of media type, not just on the same media type. BFD does not negotiate protocol versions; that is a function of the routing protocols themselves.
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