300-320 · Question #31
What network technology provides Layer 2 high availability between the access and distribution layers?
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…
Question
What network technology provides Layer 2 high availability between the access and distribution layers?
Options
- AHSRP
- BMEC
- CEIGRP
- DGLBP
How the community answered
(28 responses)- A4% (1)
- B93% (26)
- D4% (1)
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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