Cisco
352-001 · Question #11
352-001 Question #11: Real Exam Question with Answer & Explanation
The correct answer is A: EtherChannel. To forward traffic across both Metro Ethernet circuits simultaneously instead of having STP block one, EtherChannel bundles them logically and Multichassis EtherChannel extends that bundle across separate physical switches.
Question
You have created a network design that has two point-to-point Metro Ethernet circuits extending a single production VLAN between two data centers. Under normal circumstances, one circuit will carry traffic and spanning tree will block the other. If the company wants you to make use of both circuits to carry production traffic, which two technologies and features will you investigate to integrate into your network design? (Choose two.)
Options
- AEtherChannel
- BMST
- CMultichassis EtherChannel
- DPVST+
Explanation
To forward traffic across both Metro Ethernet circuits simultaneously instead of having STP block one, EtherChannel bundles them logically and Multichassis EtherChannel extends that bundle across separate physical switches.
Common mistakes.
- B. MST reduces STP instance overhead by mapping multiple VLANs to fewer instances, but it still enforces one blocking port per instance and does not allow both circuits to forward traffic for the same VLAN simultaneously.
- D. PVST+ runs a separate STP instance per VLAN and can load-balance VLANs across different links, but it still blocks one redundant port per VLAN per topology and cannot make both circuits active for a single production VLAN.
Concept tested. EtherChannel and Multichassis EtherChannel for active-active WAN links
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