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StackWise Questions

March 6th, 2015 in SWITCH 300-115 Go to comments

Question 1

Explanation

The switches are united into a single logical unit using special stack interconnect cables that create a bidirectional closed-loop path. This bidirectional path acts as a switch fabric for all the connected switches. Network topology and routing information is updated continuously through the stack interconnect. All stack members have full access to the stack interconnect bandwidth. The stack is managed as a single unit by a master switch, which is elected from one of the stack member switches.

Each switch in the stack has the capability to behave as a master or subordinate (member) in the hierarchy. The master switch is elected and serves as the control center for the stack. Both the master member switches act as forwarding processors. Each switch is assigned a number. Up to nine separate switches can be joined together. The stack can have switches added and removed without affecting stack performance.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/prod_white_paper09186a00801b096a.html

Question 2

Explanation

When we add a new switch to an existing switch stack, the election will take place automatically to choose a master switch. We don’t have to configure anything on the newly added switch. In the case you want the newly added switch to become the master, use this command then reload it:

switch(config)# switch 1 priority 15

Note: Turn off the switch before connecting the stackwise cables. Only turn it on after finishing connecting stackwise cables.

Question 3

Explanation

The picture below shows how StackWise cables are connected between switches:

stack_wise.jpg

When the stackwise cables are fully connected (as shown above), the stack ring speed is 32Gbps full-duplex. To efficiently load balance the traffic, the stackwise cables function bi-directionally with two 16 Gbps counter-rotating rings. It means packets are allocated between two logical counter-rotating paths. Each counter-rotating path supports 16 Gbps in both directions, yielding a traffic total of 32 Gbps bidirectionally.

A break in any one of the cables will result in the stack bandwidth being reduced to half (16 Gbps) of its full capacity.

Question 4

Question 5

Explanation

Subordinate switches keep their own spanning trees for each VLAN that they support. The master switch keeps a copy of all spanning tree tables for each VLAN in the stack. When a new VLAN is added or removed, all the existing switches will receive a notification of this event and update their tables accordingly.

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/prod_white_paper09186a00801b096a.html

Comments
  1. kuku
    April 14th, 2015

    Q2: somewhere written answer B is correct, say Stack ID needed as below. pls. comment.
    http://pdf.testhorse.com/300-115.pdf

  2. Juan
    April 16th, 2015

    @Kuku. No matter how much you may be right, I’ve learned to just to use the answers exactly on here. They will help you pass. In the real world, your answer will be most likely right and most probable. But don’t fight the system/machine (Cisco). They don’t care. Just get certified, and show your stuff on the job. Good luck!

  3. M
    April 21st, 2015

    @Juan: when you add a switch to the stack, it is not necessary to add the switch number. It will auto add number the switch. But if you want to, you can add it. It is not mandate. That is the reason the Answer for Question2 is A.

    Most people try to add that, so we have control of the switch numbers and also election process of the master.

  4. GZR
    July 29th, 2015

    @kuku Don’t pay attention to @Juan. It is VITAL you question everything. You must keep asking questions until you fully understand what the answer is and if, after all your research, you think an answer on this site is wrong then go with your beliefs. This web site is not written by Cisco so there’s no guarantee it is 100% accurate. Even if it was written by Cisco, there could still be Human error. There are too many certified people out who got their certs by blindly remembering answers to questions but without fully understanding the topics. Perhaps you will get lyucky and land a good job with your certification but I, personally, have rejected many candidates because their understanding of the subject area doesnt match the certifications they haveon their CV.

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    August 2nd, 2015

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  6. certprepare
    August 29th, 2015

    Because of copyrighted issues, certprepare had to remove all questions and answers. You can download them at http://www.mediafire.com/view/9mq20kx0mgam6k7/SWITCH_July_2015.pdf

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  12. MikeOk
    October 19th, 2016

    Explanation for question 4

    Bidirectional Flow
    To efficiently load balance the traffic, packets are allocated between two logical counter-rotating paths. Each counter-rotating path supports 16 Gbps in both directions, yielding a traffic total of 32 Gbps bidirectionally. The egress queues calculate path usage to help ensure that the traffic load is equally partitioned.

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    January 11th, 2017

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