GoConqr has a new look! Let us know what you think.

Sign up free

Flashcards

1.2 Configure and verify Layer 2 protocols

Dustin Sanders Networking CWNA English 43 cards

Cards in this deck (43)

  1. 1What gets returned to CDP advertisements?nothing. There is no ACK. It's a 1 directional multicast
  2. 2At what layer does CDP operate?Layer 2 only
  3. 3What is SNAP?The SubNetwork Access Protocol (SNAP) is an augmentation of the IEEE 802.2 LLC header. SNAP provides a method by which to utilize non-IEEE protocols on IEEE 802 networks.
  4. 4What is the Ethernet Multicast for CDP and VTP?01-00-0C-CC-CC-CC
    (field type 0x0802)
  5. 5What is the Ethernet Multicast for STP?01-80-C2-00-00-00
  6. 6How does CDPv1 differ from CDPv2?CDP Version-2 provides more intelligent device tracking features, including a reporting mechanism that allows for more rapid error tracking, reducing costly downtime
  7. 7What are TLVs?Type-Length-Value fields (TLVs)
    blocks of info in a CDP advertisement:
    Device ID
    Address
    Port ID
    Capabilities
    platform
    (etc)
  8. 8How can you configure the frequency of CDP advertisements?Router(config)# cdp timer seconds
    Router(config)# cdp holdtime seconds
  9. 9how do you enable cdp? how do you disable cdp?Router(config)# cdp run
    Router(config)# no cdp run
  10. 10how can you clear cdp counters?Router# clear cdp counters
  11. 11how do you clear the cdp table?Router# clear cdp table
  12. 12how can you find out specific info about a cdp neighbors on a specific interface?Router# show cdp neighbors [type number] [detail]
    example:
    SW1#sh cdp neighbors fastEthernet 0/1
  13. 13how do you find out detail on all your cdp neighbors?show cdp neighbors detail
  14. 14how can you see cdp traffic?sh cdp traffic
  15. 15what is LLDP?The Link Layer Discovery Protocol (LLDP) is similar to CDP, but is based on the IEEE 802.1ab standard. As a result, LLDP works in multivendor networks
  16. 16what advantage does LLDP have over CDP with Voip?LLDP supports additional TLVs that are unique to audio/visual devices like VoIp phones
    LLDP-MEDTLVs
  17. 17how do you see if LLDP is running?sh lldp
  18. 18how do you enable lldp?lldp run
    (no lldp run to disable)
  19. 19what are the mandatory LLDP TLVsPort description TLV
    System name TLV
    System description
    System capabilities TLV
    Management address TLV
  20. 20what is LLDP-MEDLLDP for Media Endpoint Devices (LLDP-MED) is an extension to LLDP that operates between endpoint devices such as IP phones and network devices such as switches. It specifically provides support for voice over IP (VoIP) applications and provides additional TLVs for capabilities discovery, network policy, Power over Ethernet, and inventory management.
  21. 21what is the default lldp update frequency?30 seconds
    (half that of CDP)
  22. 22how do you disable lldp globally?no lldp run global
  23. 23how do you configure lldp on a single interface?Switch# configure terminal
    Switch(config)# interface GigabitEthernet1/0/1
    Switch(config-if)# lldp transmit
    Switch(config-if)# lldp receive
    Switch(config-if)# end
  24. 24how do you enable a TLV on an interfaceSwitch# configure terminal
    Switch(config)# interface GigabitEthernet1/0/1
    Switch(config-if)# lldp med-tlv-select inventory management
    Switch(config-if)# end
  25. 25how do you clear lldp counters?Switch# clear lldp counters
  26. 26How do you clear lldp tables?Switch# clear lldp table
  27. 27how can you show specific info about an LLDP neighbor?Switch# show lldp entry *
  28. 28how can you see lldp neighbors?sh lldp neighbors
  29. 29What is UDLDUnidirectional Link Detection (UDLD)
    UDLD detects anomalous layer 2 conditions like 1 way connections before they create issues like STP loops
  30. 30How does UDLD work?performs mutual neighbor identification and neighbor ACK on top of Logical Link Control layer which enables it to detect 1 way communication
  31. 31why is 1 way communication on a link bad?If A can send to B, but B can't respond, then A never gets an ACK and can keep sending. This is really bad if B is connected to C which is looped back to A.
  32. 32what are the 2 basic mechanisms of UDLD?advertises port ID and learns about neighbors
    sends echo messages
  33. 33what is Holdtime vs Time To Live?they are the same, different names
  34. 34what is event-driven detection and echoing?If the detection process ends without the proper echo information being received, and under specific conditions, the link is considered to be unidirectional.
  35. 35What are the two modes of UDLD?Normal and aggressive
  36. 36How does normal UDLD differ from aggressive UDLD?normal mode will shut down a port only if it can explicitly determine that the associated link is faulty for an extended period of time.
    UDLD will also shut down a port if it loses bidirectional connectivity with the neighbor for the same extended period of time and subsequently fails repeated last-resort attempts to re-establish communication with the other end of the link.
  37. 37Where does UDLD run?UDLD protocol runs on top of the LLC sub-layer of OSI’s layer 2.
  38. 38what is the mulitcast address of UDLD?01-00-0C-CC-CC-CC
  39. 39how to configure UDLD message intervalsSwitch(config)# udld message time-interval
  40. 40how to configure UDLD fast message interval?Switch(config)# udld fast-hello interval
  41. 41how do you check UDLD on a specific interface?sh udld
  42. 42how to check UDLD neighborssh UDLD neighbors
  43. 43what does UDLD display as current bidirectional state when it is first enabled and it doesn't detect a neighbor?unknown

Information

Description
CWNA Networking (CCNP Switch Exam Topics) Flashcards on 1.2 Configure and verify Layer 2 protocols, created by Dustin Sanders on 21/01/2017.
Created by
Dustin Sanders
Views
2
History
  • Created by Dustin Sanders · Jan 21, 2017
  • Copied by Dustin Sanders · Jan 21, 2017
  • Copied by Dustin Sanders · Jan 21, 2017
Rating

More on Ethernet Switching Fundamentals

Feedback

What is it about?

What do you think of the new look?

How do you like it?