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HSRP Questions

April 12th, 2015 in SWITCH 300-115 Go to comments

If you are not sure about HSRP, please read our HSRP tutorial.

Question 1


The “standby track” command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. If the line protocol of the specified interface goes down, the HSRP priority is reduced. This means that another HSRP router with higher priority can become the active router if that router has standby preempt enabled.An example of using this command is shown below:

interface Ethernet0
ip address
standby 1 ip
standby 1 priority 105
standby 1 preempt
standby 1 track Serial0

Question 2

Question 3


The default decrement priority value of HSRP is 10 so 1,5,20 are wrong values -> B, C and D are not correct.

In “standby 1 track 100” command, “100” is the tracked object number, not the decrement value. Here we don’t specify a decrement value so the default value will be used -> Answer A is correct. An example of configuring tracked object number with HSRP is shown below:

Switch(config)# track 100 interface GigabitEthernet 0/0/0 line-protocol
Switch(config)#interface GigabitEthernet 0/0/0
Switch(config-if)# standby 1 track 100

If you want to specify a decrement value, we can use the “standby 1 track 100 decrement ” command instead.

Question 4


The configuration of many hundreds of subinterfaces on the same physical interface, with each subinterface having its own HSRP group, can cause the processes of negotiation and maintenance of multiple HSRP groups to have a detrimental impact on network traffic and CPU utilization.

Only one HSRP group is required on a physical interface for the purposes of electing active and standby devices. This group is known as the master group. Other HSRP groups may be created on each subinterface and linked to the master group via the group name. These linked HSRP groups are known as client or slave groups.

The HSRP group state of the client groups follows that of the master group. Client groups do not participate in any sort of device election mechanism.

Client groups send periodic messages in order to refresh their virtual MAC addresses in switches and learning bridges. The refresh message may be sent at a much lower frequency compared with the protocol election messages sent by the master group.

The standby follow command configures an HSRP group to become an IP redundancy client of another HSRP group.
Client or slave groups must be on the same physical interface as the master group.
A client group takes its state from the master group it is following. Therefore, the client group does not use its timer, priority, or preemption settings. A warning is displayed if these settings are configured on a client group.

The following example shows how to configure HSRP group 2 as a client to the HSRP1 master group:
Router(config-if)# standby 2 follow HSRP1

+ http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/15-mt/fhp-15-mt-book/fhp-hsrp-mgo.html
+ http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/command/fhp-cr-book/fhp-s2.html#wp6905113930

Question 5

Question 6

Question 7


From the output, we learn that the “Standby router is unknown” so we can conclude R2 cannot see other HSRP routers in this group. The problem can be a spanning-tree loop or a HSRP misconfiguration (for example another router is configured with virtual IP address of but in different HSRP group). But from the error message we see R2 can still communicate via its Fa1/0 so the problem may not be a spanning-tree loop.

  1. Thamizhan
    May 19th, 2015

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  2. jake
    June 2nd, 2015


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  3. Papi
    July 4th, 2015

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  4. Wil
    August 7th, 2015

    where are the questions gone for the SWITCH 300-115 Exam? here are only answers

  5. peaceful soul
    September 23rd, 2015

    Where are questions? Why only answers?

  6. boydreamer
    November 10th, 2015

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    December 28th, 2015

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  10. nad19
    April 19th, 2016

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    April 20th, 2016
  12. sam
    April 24th, 2016

    oh, questions not there

  13. sohail
    April 30th, 2016

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    April 30th, 2016

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  15. HSRP_Analyzer
    May 9th, 2016

    This is how I would have analyzed the log:

    Consider the following two lines from the log:

    FastEthernet1/0-Group 50
    %IP-4-DUPADDR: Duplicate address on FastEthernet1/0, sourced by 0000.0c07.ac28

    Remember that HSRP defines a special MAC address of the form 0000.0c07.acxx, where xx represents the HSRP group number as a two-digit hex value.
    Given that the HSRP group from this log is 50, we need to convert this decimal value to hex and append it to the default HSRP MAC.
    50 decimal = 32 hex (0x32)
    This then gives a MAC of 0000.0c07.ac32
    But MAC from log is 0000.0c07.ac28

    We can therefore safely conclude here that the HSRP group MAC does not match Group 50.
    Answer B is therefore correct — Misconfiguration!

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    July 9th, 2016


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  17. GAlarcon
    July 21st, 2016

    @HSRP_Analyzer is the best answer and explanation, i agree that this response is the correct. (Answer B – Misconfiguration)

  18. justpoll
    August 28th, 2016


    About the Question 6 – answer D. “HSRP supports up to 255 groups on the same switch or router.”
    This answer it’s wrong.
    HSRP supports a maximum of 16 groups on the same switch or router but the group number can be between 0 and 255.

  19. asslover
    September 7th, 2016

    hi guys
    Q7 is right. the real problem is:

    in the group 50 as shown in the show standby command, the virtual ip add is

    The log message is about another group which is group 40 as indicated in the mac address which has in the last two hex digits 28 which equal 40 in decimal ,

    Both groups 40 and 50 are using the same virtual address and this is HSRP misconfiguration so the answer B is right

  20. need2pass
    September 9th, 2016

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  23. rava
    November 13th, 2016


    Hi i think that you made it well by exploiting the difference between their MAC address

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    January 11th, 2017

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    February 2nd, 2017

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  30. leecharxos
    February 5th, 2017


    D. is correct
    The switch with a PFC or PFC 3 supports 256 unique HSRP group mappings, but the one with a PFC 2 supports only up to 16 unique groups.

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    February 7th, 2017

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  32. Anonymous
    February 14th, 2017

    Q6 Correct

    “HSRP supports up to 255 groups on the same switch or router”. The exact number depends on the switch platform, this is where the “up to” part of the statement is important. More high end switches and newer models support more that the often quoted 16 groups.

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