Exam 400-007 topic 1 question 44 discussion

BFD for layer3(routing), UDLD for layer2(data link level), BFD(mili-second) faster than UDLD(second), so option C is correct,

BFD is a fast and lightweight protocol designed to provide rapid failure detection in network environments. It can detect link failures, including unidirectional issues, quickly and trigger a convergence process. By enabling BFD on the fiber Ethernet connectivity between the switches, any unidirectional issues or link failures can be detected and acted upon promptly, leading to faster convergence in the network. UDLD (UniDirectional Link Detection) is another protocol that helps detect unidirectional links, but it may not provide as fast convergence as BFD. Additionally, fiber Ethernet connectivity is typically more reliable than copper Ethernet connectivity, making it a preferred choice for data center environments.

Fiber uses light waves which is faster than electron flow and they refer to Layer 3 which UDLD is L2 https://www.quora.com/Is-the-speed-of-electron-equal-to-the-speed-of-light

UDLD is faster and works on L3 links.

Shouldn't this be A as it is the same rcak, so directly connected? Fiber Ethernet connectivity with UDLD enabled