CCNA 200-125 Exam: CDP & LLDP Questions With Answers

  1. Which command would you configure globally on a Cisco router that would allow you to view directly connected Cisco devices?
    • A. cdp run*
    • B. enable cdp
    • C. cdp enable
    • D. run cdp

    Show (Hide) Explanation/Reference
    CDP is enabled by default on all Cisco routers. If it is turned off by any reason, we can turn it on again with the following command on global configuration mode:

    Router(config)#cdp run

    Note: CDP can be turned on or turned off on each interface. For example to turn off CDP on an interface we use this command:

    Router(config-if)#no cdp enable

  2. Which statement about LLDP is true?
    • A. It is a Cisco proprietary protocol.
    • B. It is configured in global configuration mode.*
    • C. The LLDP update frequency is a fixed value.
    • D. It runs over the transport layer.

    Show (Hide) Explanation/Reference
    Link Layer Discovery Protocol (LLDP) is a industry standard protocol that allows devices to advertise, and discover connected devices, and there capabilities (same as CDP of Cisco). To enable it on Cisco devices, we have to use this command under global configuration mode:

    Sw(config)# lldp run

  3. What is true about Cisco Discovery Protocol?
    • A. it discovers the routers, switches and gateways.
    • B. it is network layer protocol
    • C. it is physical and data link layer protocol
    • D. it is proprietary protocol*

    Show (Hide) Explanation/Reference
    The Cisco Discovery Protocol (CDP) is a proprietary Data Link Layer protocol (Layer 2 protocol) developed by Cisco. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address. The most popular command with CDP is “show cdp neighbors” to discover who is the neighbors.

    There are 3 columns we should pay more attention to:

    Local Interface (Local Intrfce): the interfaces on the device you are using “show cdp neighbors” command. In this case it is the interface of HOME router

    Platform: the platform of neighbor device

    Port ID: the neighbor device’s port or interface on which the CDP packets are multicast

  4. Which command you enter on a switch to display the ip address associated with connected devices?
    • A. show cdp neighbors detail*
    • B. show cdp neighbor
    • C. show cdp interface
    • D. show cdp traffic

    Show (Hide) Explanation/Reference
    Only the “show cdp neighbor detail” gives us information about the IP address of the connected device. Below is an example of this command.

  5. Which command would you configure globally on a Cisco router that to re-enable CDP if it was disabled by the administrator?
    • A. enable cdp
    • B. cdp enable
    • C. cdp run*
    • D. run cdp
  6. Which statement about Cisco Discovery Protocol is true?
    • A. It is Cisco-proprietary Protocol*
    • B. It can discover information from routers, firewalls and switches
    • C. It runs on the network layer
    • D. It runs on the physical layer and the data link layer.
  7. Which two pieces of information can be shared with LLDP TLVs? (Choose two)
    • A. device management address*
    • B. device type*
    • C. spanning-tree topology
    • D. routing configuration
    • E. access-list configuration
  8. Which two statements about LLDP are true ? (Choose two)
    • A. It uses mandatory TLVs to discover the neighboring devices*
    • B. It functions at Layer 2 and Layer 3
    • C. It is a Cisco-proprietary technology
    • D. It is implemented in accordance with the 802.11a specification
    • E. It enables systems to learn about one another over the data-link layer*
  9. What two statements about CDP are true? (Choose two)
    • A. CDP runs on the data link layer only *
    • B. CDP uses SNMP to share device information to an external server
    • C. CDP runs on the network layer and the data link layer
    • D. CDP uses TLVs to share device information*
    • E. CDP used to initiate a VTP server and client relationship

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