An engineer wants to ensure that the Spanning Tree topology appears loop free while redundant switches are present. Which Layer 2 technology must be used?
A. VPC
B. PaGP
C. LACP
D. OTV
Which Layer 2 technology must be used?
An engineer wants to ensure that the Spanning Tree topology appears loop free while redundant switches are present. Which Layer 2 technology must be used?
A. VPC
B. PaGP
C. LACP
D. OTV
Key point on the question is that they are mentioning “redundant switches” and not “redundant links”, and that can be accomplished with VPC on nexus. LACP or PaGP alone cannot create switches redunndancy, but only aggregate links on the same switch, and by the fact that there is no mentiona about stackwise or VSS, VPC results the most correct answer
Answer A
Virtual Port Channel (vPC) technology works by combining two Cisco Nexus series switches with 10GE links, which are then represented to other switches as a single logical switch for port channeling purposes to the third downstream device. With vPC, the spanning-tree topology appears loop free, allowing for multiple active/active forwarding paths and creating redundancy while also increasing bandwidth in the physical topology. The downstream device can be a server, switch, firewall, or any other device that supports IEEE 802.3ad port channels. Cisco vPC is used heavily in data center design but also can be used in campus environments to aggregate port channels used with IDF switches.
Anwer A should be right.
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