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Exam 300-420 topic 1 question 167 discussion

Actual exam question from Cisco's 300-420
Question #: 167
Topic #: 1
[All 300-420 Questions]


Refer to the exhibit. An engineer is designing a Layer 2 campus network. The design must support fast convergence and leverage as much bandwidth as possible between layers. Distribution switches do support VSS; unfortunately, not all routing protocols are available for use due to license limitations. Which solution must the engineer choose?

  • A. EtherChannel
  • B. MEC
  • C. RSTP
  • D. ECMP
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Suggested Answer: B 🗳️
by beuzec at Oct. 20, 2022, 3:01 p.m.

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mgiuseppe86
7 months ago
Selected Answer: B
Multi-Chassis EtherChannel. With inter-chassis SSO, the total switchover time is within a second and when a chassis fails or during a switchover event, all the links on that chassis go down. External switches that are single-homed into the failed chassis experience an outage. It is recommended to dual-home all connections to the SV pair using MEC technology, which primarily load-balances traffic across links, and keeps the traffic impact minimal in the event of chassis or link failure.
upvoted 2 times
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[Removed]
7 months, 2 weeks ago
Selected Answer: A
must support fast convergence and leverage "as much bandwidth as possible between layers" ->MEC alone could have blocked ports if you dont use an etherchannel
upvoted 1 times
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[Removed]
7 months, 2 weeks ago
I start to hate this exam. I could be both A & B depending on the layer you are talking about.
upvoted 1 times
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vangio
9 months, 1 week ago
Correct B
upvoted 1 times
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J2J2J2J
10 months, 1 week ago
Selected Answer: B
MEC (Multi Chassis Etherchannel)
upvoted 2 times
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andrewChan
1 year, 6 months ago
Selected Answer: B
configure StackWise Virtual on distribution layer and then configure MEC https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html
upvoted 2 times
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beuzec
1 year, 6 months ago
For me the answer is A: Etherchannel
upvoted 1 times
Sickcnt
1 year, 6 months ago
Could be but theres a reason they wrote "Distribution switches do support VSS" So it means we should be doing MEC (Multi Chassis Etherchannel) Answer B is 100% correct.
upvoted 2 times
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C (25%)
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