300-320 Question #31: Real Exam Question with Answer & Explanation

The correct answer is B: MEC. MEC (Multichassis EtherChannel) provides Layer 2 high availability between the access and distribution layers. MEC (also called MC-LAG in generic terms, or vPC in Cisco data center context) allows an access-layer switch to bundle uplinks into a single EtherChannel that terminates

Question

What network technology provides Layer 2 high availability between the access and distribution layers?

Options

AHSRP
BMEC
CEIGRP
DGLBP

Explanation

MEC (Multichassis EtherChannel) provides Layer 2 high availability between the access and distribution layers. MEC (also called MC-LAG in generic terms, or vPC in Cisco data center context) allows an access-layer switch to bundle uplinks into a single EtherChannel that terminates on two separate distribution-layer switches. This eliminates the need for Spanning Tree to block one uplink, enabling active/active Layer 2 forwarding with redundancy. HSRP (A) and GLBP (D) are Layer 3 first-hop redundancy protocols (not Layer 2). EIGRP (C) is a Layer 3 dynamic routing protocol. MEC is specifically designed for Layer 2 link redundancy and load balancing.

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