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HSRP Questions

November 15th, 2019 Go to comments

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

Question 1

Explanation

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 171.16.6.5 255.255.255.0
standby 1 ip 171.16.6.100
standby 1 priority 105
standby 1 preempt
standby 1 track Serial0

Question 2

Question 3

Explanation

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-track)#exit
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

Explanation

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

Reference:
+ 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

Explanation

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 10.10.1.1 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.

Question 8

Question 9

Comments
  1. Yr
    January 16th, 2020

    Q7 PC is duplicated IP address it is possible. No problems with HSRP here, it is possible one member, may be second wil be configured later. Not a spanning-tree or hardware (for hardware may be mac not IP address)

  2. polleke
    January 19th, 2020

    Q8 Answer E is also correct. HSRP v2 uses multicast address 224.0.0.102 with UDP port 1985

  3. Burrito
    January 25th, 2020

    @polleke I think that is the point of the question, since it doesn’t specifically state HSRPv2 that wouldn’t be correct. Kind of like question 6, answer D. That wouldn’t be correct if you were including HSRPv2, but they only have HSRP in the question. They almost seem like gotcha questions.

  4. suntzu
    February 16th, 2020

    Be forewarned if taking this test this week.

    There are two other questions similar to the one below.

    The similar question is

    Which statement about HSRP, GLBP, or VRRP is true? (Choose two)

    HSRP multicast 224.0.0.18
    VRRP multicast 224.0.0.102
    GLBP udp protocol 3332
    something random
    something random

    If you don’t read the question carefully, you may answer it wrong. Answer is GLBP udp protocol 3332.

    There is another that says “which statement about HSRP, GLBP, OR VRRP is true?(choose ONE)
    The answer is “GLBP allows for a maximum of four MAC addresses per group”.

    The other answers are random fake answers.
    Then, you have question 6 as below.
    Question 6

    Which two statements about HSRP, GLBP, and VRRP are true? (Choose two)
    A. HSRP is the preferred protocol to be used on multivendor environments.
    B. VRRP has one master router, one standby router, and many listening routers.
    C. GLBP allows for a maximum of four MAC addresses per group.
    D. HSRP supports up to 255 groups on the same switch or router.
    E. VRRP is a Cisco proprietary protocol.
    Answer C and D

    So 3 questions with similar written styles. It should be against the law for Cisco to allow such garbage.

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