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HSRP Questions

November 15th, 2019 in SWITCH 300-115 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
Comment pages
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  1. Crest
    May 28th, 2017

    224.0.0.102 is the multicast address for HSRPv2. It also uses a different virtual MAC (0000.0c9f.fXXX).
    HSRP v1 (default) uses 224.0.0.2 and 0000.0c07.acXX as virtual MAC.

  2. HSRP
    July 23rd, 2017

    By default, GLBP routers use the local multicast address 224.0.0.102 to send hello packets to their peers every 3 seconds over UDP 3222 (source and destination).

    HSRP version 2 uses the new IP multicast address 224.0.0.102 to send hello packets instead of the multicast address of 224.0.0.2, which is used by version 1.

  3. Mart
    October 16th, 2017

    Passed today 9xx
    New dumps from IT-Libraries are valid.
    Can’t share with the new “no link” ban but you can find them on google with a simple search

  4. Anon6
    December 22nd, 2017

    Question 10:
    R1# show standby
    FastEthernet0/0 – Group 1
    state is active
    2 state changes,last state change 00:20:53
    virtual IP address is 192.168.1.1
    active virtual MAC address is 0000.0c07.ac01
    local virtual MAC address is 0000.0c07.ac01 (v1 default)
    Hello time is 3 sec,hold time is 10 sec
    active router is local
    standby router is 192.168.1.3,priority 80(expires in 9.280
    Track interface Fa0/0 state up decrement 10

    Answers:A. The link will take over when …..
    B. 192.168.1.3 is active because it has higher IP address
    C. When Fa0/0 is down priority will be 80
    D. It is using default hello and hold values

    Cand D are selected as correct. Not sure about C. Any suggestions why?

  5. BreakFix
    January 7th, 2018

    Regarding Q10
    !
    Based on the following two observations, I suspect the check boxes should actually be circles.
    1. No direction given as to how many answers are to be selected.
    2. Only one correct answer exists, D.
    !
    The HSRP priority of the active router (R1) is not displayed indicating the default priority of 100 is in use.
    Fa0/0 going down would decrement the priority by 10 with the resultant being 90.
    !
    Answer C is not correct.

  6. Geriszonz
    January 29th, 2018

    @BreakFix

    The exhibit has a tracking configured for Fa0/0 with the below metrics:

    “Track interface Fa0/0 state up decrement 10”

    Therefore, if we would calculate with the HSRP default priority (100), this tracking would cause Fa0/0 priority to decrement by 10 when the interface status is UP!
    In such case the “default” priority of Fa0/0 would be 90 when operational.

    In case Fa0/0 goes down, HSRP default decrement value (10) is negated, 90-10=80.

  7. 1WAY
    February 15th, 2018

    @Breakfix, I’m not saying you are wrong but I need more convincing. Do you have a citation I can reference and understand better?

    My understanding is that the priority is decremented or incremented as the interface status changes. If that’s the case and we assume the default priority of 100, then there are two scenarios:

    1.) if the initial tracking state is up, then the priority would be decremented to 90 if the interface went down and back up to 100 when it came back up.

    2.) If the initial tracking state is down, then the priority would be decremented to 90 if the interface came up and back up to 100 when it went down.

  8. 1WAY
    February 15th, 2018

    RE: above, I don’t actually think 2. Is possible, all the literature I’ve read say’s the priority is only decremented if the interface goes down.

    I’m no expert here so would be interested to hear what others think and if there are any Cisco links/papers that say anything different.

  9. 1WAY
    February 15th, 2018

    Sorry my previous comments were meant for Geriszonz

  10. Anonymous
    March 23rd, 2018

    @BreakFix, I think you are correct, my answer would be D as correct, not C.

  11. CCNP
    March 23rd, 2018

    Q8
    HSRP version 2 uses the new IP multicast address 224.0.0.102 to send hello packets instead of the multicast address of 224.0.0.2, which is used by version 1.

    https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/9281-3.html

  12. NickMenza
    April 4th, 2018

    @Geriszonz if there a track interface configured, the priority will keep the same as configured as long as the interface tracked maintains up, only will decrease if the interface goes down, so in this case with the default priority only if down will take the value of 90 not 80 so answer C is wrong.

  13. Network Guru
    May 31st, 2018

    Hello guys:

    I just passed my CCNP-300-115 an hour ago, or so. I would like to advise those who are planning to take the test, to be careful as Cisco is coming up with a new way of tricking people. For example:
    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 D,

    So what Cisco does, is they will remove answer D and will replace it with a new answer for the same question/2. So, you go in confident that you will answer all questions you know but then you will be faced with all the questions you know with answers that you did not know before, nor have you seen them.

    STP, AAA and VTP are exactly what I got in the test. I wish you all good luck…Drag&Drop questions, I only got the true/false one.

    Network Guru

  14. CCNA-AZ
    August 13th, 2018

    Q6

    An HSRP group can be assigned an arbitrary group number, from 0 to 255.
    If you configureHSRP groups on several VLAN interfaces, it can be handy to make the group numberthe same as the VLAN number. However, most Catalyst switches support only up to 16 unique HSRP group numbers. If you have more than 16 VLANs, you will quickly run out of group numbers. An alternative is to make the group number the same (that is, 1) for every VLAN interface. This is perfectly valid because the HSRP groups are locally significant only on an interface. In other words, HSRP Group 1 on interface VLAN 10 is unique and independent from HSRP Group 1 on interface VLAN 11.

    David Hucabi – CCNP Routing and Switching SWITCH 300-115 Official Cert Guide – 2014 (p. 386)

    Group number from 0 to 255 means 256 in total.

  15. ccnp-switch
    April 28th, 2019

    hi,
    Can anyone explain the answers from Q9.I cant relate to the extract shown and how they have picked the correct answers.
    Thanks

  16. Hink
    May 14th, 2019

    Hi,

    with this line active router is 172.16.11.112
    “*Mar 1 00 16:43.295: SB11: Vl11 Hello in 172.16.11.112 Active pri 50 ip 172.16.11.115”

    but later, with this line active rotuer is 172.16.11.111
    “*Mar 1 00 16:46.207: SB11: Vl11 Hello out 172.16.11.111 Active pri 100 ip 172.16.11.115”

    Then, answer A) and B are correct.

  17. Dmytro
    October 9th, 2019

    Q8, why variant “E. HSRP uses multicast address 224.0.0.102” is not right?
    HSRPv2 uses multicast address 224.0.0.102:
    https://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/9281-3.html

  18. Abdu
    November 3rd, 2019

    Q7 : isn’t that question the same as Q4 in HSRP Questions 4 https://www.certprepare.com/hsrp-questions-4-2 ?

    Q4 in HSRP questions 4 answer was : STP loop. Q7 here HSRP misconfiguration
    which one is right if they are the same?

  19. ciscoguy
    December 4th, 2019

    anybody have the latest exam dumps and a cracked copy of vce, please share?

  20. None
    December 15th, 2019

    Anybody who wrote 300-115 recently? are these questions valid?

  21. 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)

  22. polleke
    January 19th, 2020

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

  23. 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.

  24. 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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