Which two attributes about BFD are true? (Choose two.)
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A. B. C. D. E.CD.
BFD (Bidirectional Forwarding Detection) is a protocol used to provide rapid detection of forwarding path failures between two adjacent network nodes, such as routers. It works by sending small, periodic packets to the remote node, and expecting a response within a certain time frame. If no response is received within that time, the path is considered failed, and the protocol can take appropriate action, such as updating routing tables to reroute traffic.
Based on this, let's examine the two true attributes about BFD:
D. Detects forwarding failures in milliseconds This is true. BFD is designed to detect forwarding path failures very quickly, typically in the order of milliseconds. This makes it ideal for use in environments where rapid failover is required, such as in high availability or real-time applications.
E. More CPU intensive than routing protocol adjacency messages This is also true. BFD packets are sent more frequently than routing protocol adjacency messages, and they require more processing overhead, which can increase the CPU load on network devices. Therefore, it's important to carefully configure BFD to balance the need for rapid failure detection with the potential impact on network performance.
A, B, and C are not true:
A. Implemented only on route processors BFD can be implemented on both route processors and line cards, depending on the specific network device and configuration.
B. Increases the control plane CPU load As mentioned earlier, BFD can increase the CPU load on network devices, but this doesn't necessarily mean it will increase the control plane CPU load specifically. This can depend on the device and how BFD is configured.
C. Implemented on line cards As noted above, BFD can be implemented on both route processors and line cards, depending on the specific network device and configuration.