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CDP & LLDP Questions

July 9th, 2017 in SWITCH 300-115 Go to comments

Question 1

Explanation

Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help in finding information about neighboring devices. The default values are 60 seconds for advertisements. Each neighbor will keep the information contained in a packet for 180 seconds (holddown timer).

Question 2

Question 3

Explanation

CDP runs at Layer 2 so a router running CDP can see a Layer 2 switch that is directly connected to it, provided that the Layer 2 switch also runs CDP.

Question 4

Explanation

Unlike CDP, Link Layer Discovery Protocol (LLDP) is an open IEEE-standard (802.1AB) Layer 2 protocol used by network devices to share information about their identities and functionality with other network elements.

Question 5

Explanation

Cisco Discovery Protocol Version 2 provides more intelligent, device-tracking features than those available in Version 1. One of the features available is an enhanced reporting mechanism for more rapid error tracking, which helps to reduce network downtime. Errors reported include mismatched native VLAN IDs (IEEE 802.1Q) on connected ports and mismatched port-duplex states between connected devices. Messages about reported errors can be sent to the console or to a logging server.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/xe-3s/asr903/cdp-xe-3s-asr903-book/nm-cdp-discover.html

Question 6

Explanation

Unlike CDP, Link Layer Discovery Protocol (LLDP) is an open IEEE-standard (802.1AB) Layer 2 protocol used by network devices to share information about their identities and functionality with other network elements.

Question 7

Explanation

Cisco devices send periodic CDP announcements to the multicast destination address 01-00-0c-cc-cc-cc out each connected network interface. These multicast packets may be received by Cisco devices. This multicast destination is also used in other Cisco protocols such as VTP.

Question 8

Explanation

The information contained in Cisco Discovery Protocol announcements depends on the device type and the version of the operating system running on it. The following are examples of the types of information that can be contained in Cisco Discovery Protocol announcements:
+ Cisco IOS XE version running on a Cisco device
+ Duplex setting
+ Hardware platform of the device
+ Hostname
+ IP addresses of the interfaces on devices
+ Interfaces active on a Cisco device, including encapsulation type
+ Locally connected devices advertising Cisco Discovery Protocol
+ Native VLAN
+ VTP domain

Cisco Discovery Protocol Version 2 provides more intelligent device tracking features than Version 1.

Question 9

Explanation

Media Endpoint Discovery is an enhancement of LLDP, known as LLDP-MED, that provides the following facilities:
+ Auto-discovery of LAN policies such as VLAN, Layer 2 Priority and Differentiated services (Diffserv) settings, enabling plug and play networking.
+ Device location discovery to allow creation of location databases and, in the case of Voice over Internet Protocol (VoIP), Enhanced 911 services.
+ Extended and automated power management of Power over Ethernet (PoE) end points.
+ Inventory management, allowing network administrators to track their network devices, and determine their characteristics (manufacturer, software and hardware versions, serial or asset number).

The LLDP-MED protocol extension was formally approved and published as the standard ANSI/TIA-1057 by the Telecommunications Industry Association (TIA) in April 2006.

Question 10

Explanation

LLDP supports a set of attributes that it uses to discover neighbor devices. These attributes contain type, length, and value descriptions and are referred to as TLVs. LLDP supported devices can use TLVs to receive and send information to their neighbors. This protocol can advertise details such as configuration information, device capabilities, and device identity.
The switch supports these basic management TLVs. These are mandatory LLDP TLVs.
+ Port description TLV
+ System name TLV
+ System description TLV
+ System capabilities TLV
+ Management address TLV
These organizationally specific LLDP TLVs are also advertised to support LLDP-MED.
+ Port VLAN ID TLV ((IEEE 802.1 organizationally specific TLVs)
+ MAC/PHY configuration/status TLV(IEEE 802.3 organizationally specific TLVs)

-> No VTP information is supported in LLDP.

Question 11

Explanation

Cisco Discovery Protocol Version 2 has three additional type, length, values (TLVs): VTP Management Domain Name, Native VLAN, and full/half-Duplex.

Question 12

Explanation

The default CDP timer (the frequency a router sends CDP packets) is 60 seconds and the hold time (the amount of time a receiving device retains the CDP information sent by other devices) is 180 seconds. In this case the question wants to ask about CDP timer. Therefore half of the default CDP timer is 30 seconds.

Question 13

Question 14

Question 15

Question 17

Explanation

The information contained in Cisco Discovery Protocol advertisements varies based on the type of device and the installed version of the operating system. Some of the information that Cisco Discovery Protocol can learn includes:
+ Cisco IOS version running on Cisco devices
+ Hardware platform of devices
+ IP addresses of interfaces on devices
+ Locally connected devices advertising Cisco Discovery Protocol
+ Interfaces active on Cisco devices, including encapsulation type
+ Hostname
+ Duplex setting
+ VLAN Trunking Protocol (VTP) domain
+ Native VLAN

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/configuration/15-mt/cdp-15-mt-book/nm-cdp-discover.html

Comments
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  1. Ravianath
    June 29th, 2017

    Hi..
    I am going to do ccnp exam in next month.. But i dont have any dump… please help me.. my Gmail account – Ravinathrasara at gmail . com
    Thanks

  2. Anonymous
    July 3rd, 2017

    Why don’t the questions show? Only answers?

  3. Anonymous
    July 3rd, 2017

    please can anyone assist me with a valid dump email to “Barrieabubakar @ gmail . com”

  4. Anonymous
    July 3rd, 2017

    I believe only answers are shown is because Cisco is going after sites with actual questions based on copyright infringement

  5. Ravianath
    July 4th, 2017

    Where the questions….???.. how i get those questions…

  6. Tauson
    July 12th, 2017

    Hi everyone,

    I am writing CCNP Switching next month, would you guys please share with the latest dumps to practice with.

    My email address: {email not allowed}

    Thanks in advance

  7. Tauson
    July 12th, 2017

    Hi everyone,

    I am writing CCNP Switching next month, would you guys please share with the latest dumps to practice with.

    Please DM me a link to download on twitter @beingtauson

    Thanks in advance

  8. mikeSWE
    July 20th, 2017

    @Tauson

    www 110. zippyshare. com /v/PaeanjaX/file . html
    Remove the Spaces to get the latest dump from exams4all as of 18th of July 400q (many repeats) but it contains all the new DD both VCE and PDF are in the zipfile

  9. Ali
    July 26th, 2017

    @Mike

    Do you have also have dump for route and t-shoot exams?

  10. Tobby
    July 29th, 2017

    Hi,
    About question 11,
    Which two statements about CDP are true? (Choose two.)

    A. CDP uses a TLV to advertise the native VLAN
    B. CDP is not supported with SNMP
    C. CDP is supported on Frame Relay sub interfaces.
    D. CDP runs on OSI layer 2
    E. CDP runs on OSI layer 1

    Answer: AC

    According to http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cdp/command/cdp-cr-book/cdp-cr-a1.html A. CDP uses a TLV to advertise the native VLAN is correct

    And according to https://supportforums.cisco.com/discussion/9241526/tagged-8021q-vlans-over-frame-relay C. CDP is supported on Frame Relay subinterfaces. is correct

    But CDP also runs on OSI layer 2….and D would be also correct….what do you think?

  11. Anonymous
    July 31st, 2017

    Tobby you right. i was also looking for the right ans for this que. i found A, C and D are correct. now the big que is, which two ans are correct A and C or A and D or A, C and D ????

  12. vivian
    August 2nd, 2017
  13. Anonymous
    August 6th, 2017

    Why don’t the questions show? Where to get the questions?
    I am writing CCNP Switching next month, would you guys please share with the latest dumps to practice with. (“raymangunner @ yahoo .com”)

  14. BL
    August 8th, 2017

    This question come out today.

    Which two statements about CDP are true? (Choose two)

    Answer:
    – CDP uses a TLV to advertise the native VLAN
    – CDP is supported on Frame Relay sub interface

  15. Sam
    August 14th, 2017

    Hi Guys,
    I am planing write CCNP Switching next week, would you guys please share with the latest dumps to my email.
    Please send to amilacst10ATgmail.com

    Best Regards

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