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HSRP Questions

September 2nd, 2017 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
  1. Thamizhan
    May 19th, 2015

    First one to comment on this page!!!
    Helpful hsrp .. looks similar to 642-813

    Thanks Certprepare

  2. jake
    June 2nd, 2015

    Hi,

    For HSRP, VRRP and GLBP do more practical example…
    As a good practical article series on HSRP, VRRP and GLBP, check below:

    http://ipcisco.com/redundancy-protocols-part-3-hsrp-configuration/

  3. Papi
    July 4th, 2015

    How real are these questions?

  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

    why there are no question?? can someone help explain please! I’m taking exam this Dec. preparing for it

  7. boydreamer
    November 10th, 2015

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  8. Anonymous
    December 28th, 2015

    Hallo all,

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  9. cleitonlobo
    January 7th, 2016

    Can you send me valid dumps?

  10. nad19
    April 19th, 2016

    I cant see the questions, can anybody help me?

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

    oh, questions not there

  13. sohail
    April 30th, 2016

    please tell me where is hsrp lab……?

  14. sohail
    April 30th, 2016

    please where is HSRP LAB.Which people mention above….

  15. HSRP_Analyzer
    May 9th, 2016

    Q7
    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 10.10.1.1 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

    HI,

    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 10.10.1.1

    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 10.10.1.1. and this is HSRP misconfiguration so the answer B is right

  20. need2pass
    September 9th, 2016

    Very sad but will not lose faith
    I failed today deep 7XX and did not get to see all question for the simulation of HSRP
    only answered 1 and that is what sinked me
    all labs are valids

  21. rava
    November 13th, 2016

    @HSRP_Analyzer

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

  22. Anonymous
    December 14th, 2016

    @ Kazumi – do you mean you passed yesterday

  23. Jake
    December 27th, 2016

    STOP advertising other websites! Either provide dumps and pay it forward or keep comments to yourself. Donate to this website!

  24. Veronica
    February 2nd, 2017

    Exam 300 115 has changed as of January 31 2017. Any idea where to get the new dumps?

  25. leecharxos
    February 5th, 2017

    @justpoll

    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.
    https://supportforums.cisco.com/document/20366/what-maximum-number-unique-hsrp-groups-supported-catalyst-65006000-series-switch

  26. GalE
    February 7th, 2017

    @Veronica, 191q dumps is still valid, but with new questions check https://www.certprepare.com/new-updated-questions (you need to sign up as Premium member). Labs are the same – that’s the feedback from this forum. Have you taken the test after January 31st? I’m taking it this February and is also looking for feedback

  27. 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.

  28. jane
    May 17th, 2017

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  29. Anonymous
    May 20th, 2017

    Que: what is harp Multicast address for harp?
    224.0.0.102
    This was in exam

  30. 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.

  31. 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.

  32. 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

  33. 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?

  34. 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.

  35. 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.

  36. 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.

  37. 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.

  38. 1WAY
    February 15th, 2018

    Sorry my previous comments were meant for Geriszonz

  39. Anonymous
    March 23rd, 2018

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

  40. 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

  41. 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.

  42. 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

  43. 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.

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