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Exam 300-420 topic 1 question 76 discussion

Actual exam question from Cisco's 300-420
Question #: 76
Topic #: 1
[All 300-420 Questions]

An engineer must design a large Layer 2 domain that contains hundreds of switches and VLANs. The engineer's primary goals are to:
✑ Efficiently utilize the bandwidth of all links
✑ Avoid Layer 2 loops
✑ Cause minimal impact on switch CPU and memory
Which technology should the engineer include in the design?

  • A. MST
  • B. Rapid PVST+
  • C. RSTP
  • D. PVST+
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by MangoBingsu at Dec. 10, 2021, 12:20 a.m.

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MangoBingsu
Highly Voted 2 years, 5 months ago
Selected Answer: A
I believe it is MST. MST groups a large amount of VLANS into single instances which lower the amount of CPU and memory utilization. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html#mst
upvoted 11 times
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Clauster
Most Recent 9 months, 2 weeks ago
Oh Dang guys, MST is not a thing, they got us all with this, MST means nothing, MSTP is multiple Spanning Tree which would be the right answer but unfortunately is not listed so the next best Option is the Rapid one, i just realized this, dang Cisco is trying hard to make us fail the test. The Right answer is the given one.
upvoted 2 times
Lungful
9 months ago
This Cisco link uses "MST" everywhere. MST is fine. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24248-147.html
upvoted 2 times
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mgiuseppe86
7 months, 3 weeks ago
Bro you played yourself.
upvoted 2 times
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SpicyMochi
1 year ago
Selected Answer: A
MST (Multiple Spanning Tree) should be included in the design because it can efficiently utilize the bandwidth of all links while preventing Layer 2 loops, and it causes minimal impact on switch CPU and memory.
upvoted 1 times
mgiuseppe86
7 months, 3 weeks ago
You literally just copied and pasted the question and formulated a paragraph as if you retrieved it from somewhere.
upvoted 2 times
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andrewChan
1 year, 6 months ago
configure mulitple MST groups may utilize all links, and reduce CPU usage. as each vlan on PVST+ /RPVST+ has it own SPT instance.
upvoted 1 times
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cwoolie
2 years, 1 month ago
A is answer
upvoted 1 times
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laterst
2 years, 2 months ago
Selected Answer: A
Agree, MST builds a spanning tree topology per instance, while RPVST+ builds one topology per VLAN.
upvoted 1 times
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MaestroGJE
2 years, 4 months ago
Yes, I agree. MST is the right answer: The CPU and memory requirements are less than for Rapid PVST+ https://www.ciscopress.com/articles/article.asp?p=2832407&seqNum=5
upvoted 3 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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