Fast Path Failure Detection in Network Design
Question
Which two mechanisms ensure that a network design provides fast path failure detection? (Choose two.)
Answers
Explanations
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A. B. C. D.AB.
The two mechanisms that ensure that a network design provides fast path failure detection are:
A. Bidirectional Forwarding Detection (BFD) B. Fast Hello packets
Bidirectional Forwarding Detection (BFD): BFD is a protocol designed to provide fast failure detection for all types of networks. It is a lightweight protocol that can be used with a wide range of network protocols, including OSPF, BGP, and MPLS. BFD provides sub-second detection of failures and can be used to detect both link and node failures. It is used to detect failures in the forwarding path, and it can also be used to detect failures in the return path. BFD works by sending periodic control packets between two endpoints, and if one endpoint fails to receive a packet, it can declare a failure. BFD is a very effective mechanism for fast path failure detection.
Fast Hello Packets: Fast Hello packets are a mechanism used to detect failures in network links. They work by sending small packets between two endpoints at a very high rate, typically several times per second. The idea behind fast hello packets is that if a link fails, the packets will stop being received, and the endpoints can quickly detect the failure. Fast hello packets are typically used in conjunction with routing protocols such as OSPF and BGP. Fast hello packets are a simple and effective mechanism for detecting link failures.
UDLD and IP Cisco Express Forwarding (CEF) are not mechanisms that provide fast path failure detection. UDLD is a protocol used to detect unidirectional links, and IP CEF is a forwarding technology used to improve the performance of IP packet forwarding. While both are important for network design, they do not provide fast path failure detection.
