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Exam 350-401 topic 1 question 437 discussion

Actual exam question from Cisco's 350-401
Question #: 437
Topic #: 1
[All 350-401 Questions]


Refer to the exhibit. What does the output confirm about the switch's spanning tree configuration?

  • A. The spanning-tree operation mode for this switch is PVST.
  • B. The spanning-tree operation mode for this switch is PVST+.
  • C. The spanning-tree mode stp ieee command was entered on this switch.
  • D. The spanning-tree operation mode for this switch is IEEE.
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Suggested Answer: B 🗳️
by Ferrantee at Sept. 10, 2022, 11:49 p.m.

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rafaelinho88
Highly Voted 1 year, 9 months ago
Selected Answer: B
The default spanning-tree mode in Cisco switch is PVST+. This spanning-tree mode is based on the IEEE 802.1D standard and Cisco proprietary extensions. PVST+ is same as standard IEEE 802.1D but it runs on each VLAN. In the output we see the line “Spanning tree enabled protocol ieee” under “VLAN 20” so it can say the switch is running in PVST+ mode.
upvoted 10 times
abrielirus123
3 months ago
Both PVST and PVST+ are per VLAN, the abbreviation stands for Per VLAN Spanning Tree after all. See differences here: - 802.1q (standard) supports only one single instance of STP native VLAN (Common Spanning Tree) - (let's say channel 1) one STP instance - (let's say channel 2) - PVST (Cisco proprietary) Support one STP instance per each VLAN uses ISL trunk only. Doesn't support 802.1q - PVST+ (Cisco proprietary) Enhance PVST capabilities by allowing to transport PVST over 802.q : native VLAN over "Common Spanning Tree" (over channel 1) Each per-VLAN STP is encapsulated using a special Multicast MAC and transported (over channel 2)
upvoted 1 times
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Ferrantee
Highly Voted 2 years, 1 month ago
B - PVST+ enables support to IEEE Devices, "SPanning tree enabled protocol IEEE" output confirms PVST+
upvoted 5 times
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[Removed]
Most Recent 5 months, 2 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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landgar
1 year, 9 months ago
Selected Answer: B
The reason of using PVST+ is that it is applied to VLAN 20. PVST does not exist, and IEEE is the same as STP.
upvoted 3 times
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nushadu
1 year, 10 months ago
Selected Answer: B
sw2(config)# sw2(config)#do s spanning-tree vl 1 summ | i mode Switch is in pvst mode sw2(config)# sw2(config)# sw2(config)#do s spanning-tree vl 1 det | i ieee VLAN0001 is executing the ieee compatible Spanning Tree protocol sw2(config)#do s spanning-tree vl 1 | i ieee Spanning tree enabled protocol ieee sw2(config)# sw2(config)#do s runn | s mode pv spanning-tree mode pvst sw2(config)# https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/routers/ncs5xx/ncs520/configuration/guide/LAN-switch/17-1-1/b-lanswitch-17-1-1-ncs520/b-lanswitch-17-1-1-ncs520_chapter_0110.html.xml
upvoted 3 times
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