ICND2 – STP Questions
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Question 1
[am4show have=’p2;’]Which IEEE standard does PVST+ use to tunnel information?
A. 802.1x
B. 802.1q
C. 802.1w
D. 802.1s
Answer: B[/am4show]
Explanation
Cisco developed PVST+ to allow strolling numerous STP instances, even over an 802.1Q network via the use of a tunneling mechanism. PVST+ utilizes Cisco gadgets to hook up with a Mono Spanning Tree area to a PVST+ region. No particular configuration is needed to attain this. PVST+ affords assist for 802.1Q trunks and the mapping of a couple of spanning trees to the single spanning tree of popular 802.1Q switches strolling Mono Spanning Tree.
Question 2
[am4show have=’p2;’]What is one benefit of PVST+?
A. PVST+ reduces the CPU cycles for all the switches in the network.
B. PVST+ automatically selects the root bridge location, to provide optimization.
C. PVST+ allows the root switch location to be optimized per vlan.
D. PVST+ supports Layer 3 load balancing without loops.
Answer: C[/am4show]
Explanation
Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. It means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic.
Question 3
[am4show have=’p2;’]Which spanning-tree feature places a port immediately into a forwarding stated?
A. BPDU guard
B. PortFast
C. loop guard
D. UDLD
E. Uplink Fast
Answer: B[/am4show]
Explanation
When you enable PortFast on the switch, spanning tree places ports in the forwarding state immediately, instead of going through the listening, learning, and forwarding states.
Question 4
[am4show have=’p2;’]If primary and secondary root switches with priority 16384 both experience catastrophic losses, which tertiary switch can take over?
A. a switch with priority 20480
B. a switch with priority 8192
C. a switch with priority 4096
D. a switch with priority 12288
Answer: A[/am4show]
Explanation
This is a tricky question. We know the switch with lowest value of priority is elected the root switch. Therefore in this question the switches with priority of 4096, 8192, 12288 (which are lower than the current value of the root bridge 16384) are not joining the root bridge election by somehow. The only suitable answer is the switch with priority 20480 will become the root bridge.
Question 5
[am4show have=’p2;’]Which factors generate bridge ID? (Choose two)
A. MAC address
B. IP Address
C. STP Priority
D. Bridge Priority
Answer: A D[/am4show]
Explanation
The switches compare their Bridge ID with each other to find out who will be the root bridge. The root bridge is the bridge with the lowest bridge ID.
Bridge ID = Bridge Priority + MAC Address
Question 5> Correct me if I’m wrong, but isn’t the correct answer (D) since the question is referring to RSTP not STP. I was under the impression Rapid PVST got rid of timers?
@RCC: Yes, the answer of Q5 should be D. Thanks for your detection. We have just fixed it!
Hi shouldn’t the answer for Q1 be D ? because the priority of fa0/10 to vlan 2 is 128.2 so not the best value. therefore it doesn’t have the best bridge id for vlan 2, and hence wasn’t elected as root for vlan 2?
Could someone please explain the why the answer to Q 7 is “A”. To me C feels right.
I think the idea for question 7 is that the election was ALREADY held, and the switches for B, C, and D lost for some reason (or else C would already be the root switch). Therefore, only choice A makes sense.
You have configured your switches with the spanning-tree vlan x root primary and spanning-tree vlan x root secondary commands. Which of the following tertiary switch will
take over if both switches fail?
A. A switch with priority 4096
B. A switch with priority 8192
C. A switch with priority 12288
D. A switch with priority 20480
i dont find questions… just the Explanation part is here… where are all the Questions anyway?
Please, send us a link with the questions!! Pleaseeee
Souza: You have to become a member to see the questions. The sign up fee is $12.
I am a premium member and have paid, but there are no questions visible on https://www.9tut.net/icnd2-200-105/stp-questions-2
Had to login again. Was logged in and going over the sections, but suddenly had no questions.
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Reference: http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=4
Found this pdf with the CCNA questions, can anyone confirm if this are valid https://drive.google.com/open?id=0B5mAFqgydmCzYWtLR3h6aUtBazg
Shouldn’t the answer for question 4 be the lowest priority instead of the highest?
Question 4 answer clarified. The lowest priority that can possibly be assigned is 4096 and the lowest priority is the root switches. So, if a switch priority of 4096, 8192, and 12288 existed, they would be the root bridge already and not the 16384. Therefore, the logical assumption is 16384 is the lowest bridge ID in the topology and none of the switches in this topology have a priority of 4096, 8192, and 12288. The next highest priority is 20480 (ie 20480 = 16384 + 4096) which is why this is the correct answer.
on question 4 is correct:
Exm1. If a root switch has a priority greater than 24,576 (6 x 4096) a priority of 24,576 is set.
* If the current root has a priority of 24,576 or less, the IOS finds the highest minimum value to ensure that the switch becomes the new root: If the current root is 5 x 4096, our switch will assume the priority of 4 x 4096
The secondary root is automatically assigned Priority 28.672 (7 x 4096 for example 1) Regardless of the priority of the main root (so the command only works with default values on the other switches).
I passed ICND2 on November 4th with 854! There are 54 questions, 4 drag and drop 2 labs for me EIGRP and GRE, BGP, ACL, IP SLA, RSTP, HSRP, PPPOE Questions! I have all the labs, and the majority of the questions, I have two courses and a lot of labs from CISCO and UDEMY to be prepare write alberthdr AT hotmail point com