Home > CDP & LLDP Questions 4

CDP & LLDP Questions 4

November 25th, 2019 Go to comments

Question 1

Explanation

VLAN 1 is always used for CDP, VTP, PAgP traffic (except DTP uses native VLAN) even if VLAN 1 is not the native VLAN. If VLAN 1 is not the native VLAN then CDP, VTP, PAgP traffic will be tagged on the trunk.

Question 2

Question 3


Explanation

The command “no lldp transmit” disallows sending LLDP packets on the interface.

Reference: https://www.cisco.com/c/en/us/td/docs/wireless/access_point/atnms-ap-82/configuration/guide/cg-82-book/cg-chap-LLDP.pdf

Note: The “lldp receive” command enables the reception of LLDP packets on an interface.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/system_management/configuration/guide/sm_nx_os_cg/sm_lldp.html

Question 4

Question 5

Question 6

Explanation

The command “lldp timer rate” is used to set the sending frequency of LLDP updates in seconds. The range is 5 to 65534 seconds; the default is 30 seconds.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_58_se/configuration/guide/2960scg/swlldp.pdf

Question 7

Explanation

LLDP and CDP can run simultaneously. LDDP uses multicast address 01-80-C2-00-00-0E and the default time between protocol frames is 30 seconds

Question 8

Question 9

Comments
  1. Anonymous
    January 14th, 2020

    Question 4

    A question about which is true about CDP? (Choose two)
    A. disabled when native VLAN mismatched
    B. can be disable on interface only
    C. send periodic broadcast
    D. send periodic multicast

    D = Correct
    A , B, C = Incorrect.
    The question should be SINGLE choice.

  2. Raspasoti
    January 28th, 2020

    I agree with the Anonymous above. In fact Q4’s answer A from this section contradicts Q2’s answer C from section “CDP & LLDP Questions 3”.
    Please fix the question. This is only creating confusion.
    CDP detects a native VLAN mismatch. I didn’t find any documentation that says that it becomes disabled after the fact.

  3. lass
    February 6th, 2020

    Q3

    Surprise to not see any comments about this question.
    I believe the correct answer could be “C. lldp receive”

    – to transmit we explicitly need to configure the command #lldp transmit.
    if we only use #lldp receive it will achieve what the questions is asking for, accept packages but not receiving them.

    – on the other hand of we only use #no lldp transmit, all we are saying is that we don’t want the interface to transmit but without the additional command #lldp receive, we won’t accept lldp packages either.

  4. Cisco exam victim
    February 7th, 2020

    @lass, I Completely agree, and came here to write the same. LLDP is disabled by default. the command lldp receive enables receive, only, which is what the question asks. no lldp transmit does nothing, as LLDP is already disabled in both directions by default. It would have the desired effect if LLDP had already been configured.

  5. Cisco Exam Victim
    February 7th, 2020

    @lass Further to my previous, It is a bit of a trick question. On further research:
    LLDP receive – Enabled, after LLDP is enabled globally
    LLDP transmit – Enabled, after LLDP is enabled globally

    So it;s a two step process, enable it globally, which you have to do first, which the question takes as an assumption.
    Then disable Tx

  6. King in the Castle
    February 11th, 2020

    Q1: Which two control protocol use the native VLAN 1 by default? (Choose two)
    A . STP
    B . CDP
    C . VTP
    D . LACP
    E . NTP

    @certprepare please update the choices.

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