Ah, the joys of standardization. Next up, the IEEE 802.3zzz 'Snooze-Inducing Ethernet' standard. Guaranteed to put network engineers to sleep with its riveting specifications!
I'm with Misty on this one. If the question says not to use EFM for that purpose, then C is definitely wrong. Although, I do have to wonder who comes up with these exam questions. They're getting trickier every year!
Wait, what? C is definitely not correct. The question clearly states that the EFM standard 'should not be used at the core to trigger MPLS protection.' Looks like someone didn't read the options carefully enough.
I'm pretty sure C is also correct. The EFM standard can be used to trigger MPLS protection mechanisms at the core when physical failure detection is not possible. I mean, why else would they include that option?
A, E, and D are the correct answers. The IEEE 802.3ah EFM standard is used for monitoring and troubleshooting point-to-point full-duplex links, as well as in the last-mile connection to the Service Provider demarcation device. It should not be used at the core to trigger MPLS protection, as BFD is the recommended method for that purpose.
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