HPE6-A45 Exam QuestionsBrowse all questions from this exam

HPE6-A45 Exam - Question 48


Refer to the exhibits.

Exhibit 1 -

Exhibit 2 -

Switch-1(config)# spanning-tree -

Switch-1(config)# spanning-tree config-name "exam"

Switch-1(config)# spanning-tree instance 1 vlan 10-19

Switch-1(config)# spanning-tree instance 2 vlan 20-29

Switch-2(config)# spanning-tree -

Switch-2(config)# spanning-tree config-name "exam"

Switch-2(config)# spanning-tree instance 1 vlan 10-19

Switch-2(config)# spanning-tree instance 2 vlan 20-29

Switch-2(config)# spanning-tree priority 0

Switch-2(config)# spanning-tree instance 1 priority 0

Switch-2(config)# spanning-tree instance 2 priority 1

Switch-3(config)# spanning-tree -

Switch-3(config)# spanning-tree config-name "exam"

Switch-3(config)# spanning-tree instance 1 vlan 10-19

Switch-3(config)# spanning-tree instance 2 vlan 20-29

Switch-3(config)# spanning-tree priority 1

Switch-3(config)# spanning-tree instance 1 priority 1

Switch-3(config)# spanning-tree instance 2 priority 0

Switch-4(config)# spanning-tree -

Switch-4(config)# spanning-tree config-name "exam"

Switch-4(config)# spanning-tree instance 1 vlan 10-19

Switch-4(config)# spanning-tree instance 2 vlan 20-29

The network administrator enters the commands shown in Exhibit 2. What is the spanning tree status on A1 and A2?

Show Answer
Correct Answer: B

Spanning Tree Protocol (STP) is used to prevent network loops in a network with redundant paths. In this scenario, Switch-2 has the highest priority (root bridge of instance 1) for VLANs 10-19, while Switch-3 has the highest priority (root bridge of instance 2) for VLANs 20-29. A1 and A2 are the ports connecting Switch-4 to Switch-2 and Switch-3, respectively. Since Switch-2 is the root bridge for VLANs 10-19, A1 on Switch-4 would be in a forwarding state. For VLANs 20-29, Switch-3 is the root bridge, so A2 on Switch-4 would be in forwarding state. To maintain network stability and avoid loops, A1 and A2 cannot both be in forwarding state simultaneously for the same VLAN. Therefore, one port will forward traffic while the other will block it. Hence, the correct answer is that A1 on Switch-4 will be in a forwarding state and A2 will be blocking traffic.

Discussion

4 comments
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GiGiWRCOption: D
May 26, 2020

D is the good one. Switch 1 is the master for CIST and vlan2 & 3 are managed by CIST, so one forwarding an the other blocked to avoid loops.

TechLerninOption: D
Oct 8, 2020

I'm liking D. Both VLANs in CST, CST root bridge via A1. A2 has highest cost back to root.

EdwinHOption: A
Mar 31, 2020

COrrect answers is A. Each link have a different VLAN

fybz
Aug 6, 2020

I think so too

mgrahn
Sep 15, 2020

the switch use MSTP and not PVST+. the vlan arent in any instanz, the ports work like RSTP

LeTanOption: B
Sep 20, 2020

B is correct, VLAN 2,3 belong a instant 0, elect Switch 2 as a root switch, A1 is fwd, A2 is blk.