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Flashcards

1.4 Configure and verify trunking

Dustin Sanders Networking CWNA English 60 cards

Cards in this deck (60)

  1. 1What is VTP?A cisco proprietary layer 2 protocol that manages vlan configuration consistency
  2. 2What happens to the vlan configs of stack slaves when the stack master learns of a vlan change from VTP?the slave configs are updated to match that of the master's
  3. 3what range of vlans are supported by VTP?only normal range vlans, not extended range vlans. 1-1005
  4. 4What is the VTP domain?An administrative scope for managing VTP
  5. 5How many VTP domains can a switch belong to?1
  6. 6if a switch is a VTP server, what must it belong to before you can make changes to VLANs?a VTP domain
  7. 7what must you always verify before adding a VTP switch in client mode to a domain/verify that the revision number is lower than that of the other switches in a domain
  8. 8what are the 4 VTP modes?VTP Server
    VTP client
    VTP transparent
    Off
  9. 9what is the role of VTP server mode?Creates, modifies, and delete VLANs for the entire VTP domain. Advetises configurations to other switches in domain
  10. 10what is the role of VTP client mode?hey listen to VTP advertisements from other switches and modify their VLAN configurations accordingly
  11. 11what is the role of VTP transparent mode?VTP transparent switches do not participate in VTP.
    (In VTP version 1 switch doesn't even relay VTP info, ver2 + can relay)
  12. 12How can you configure VTP mode?SW1(config)# vtp mode {server | client | transparent | off}
    SW1(config)# vtp password password [hidden | secret]
  13. 13how do you check VTP status?sh VTP status
  14. 14when does VTP send summary advertisements?every 300 seconds or whenever a vlan database change happens
  15. 15what does VTP send after a configuration change advertisement?a Subset advertisement that lists the specific changes that have been performed
  16. 16How does a VTP client get information is lacks?A VTP advertisement request
  17. 17Where is VTP info stored on catalyst switches?vlan.dat, separate from NVRAM
    (this way switch can recover last vlan config after it reboots, so if you fuck up a vtp change, you can reload the switch if you haven't written the config change to memory)
  18. 18What information is distributed by VTP advertisements?– VTP domain name
    – VTP configuration revision number
    – Update identity and update timestamp
    – MD5 digest VLAN configuration, including maximum transmission unit (MTU) size for each VLAN.
    – Frame format
  19. 19how do you configure a VTP device to be a server?SW1(config)# vtp mode server
    SW1(config)# vtp domain
    SW1(config)# vtp password
  20. 20What does VTP v3 support that is not in VTP v1, v2?Enhanced authentication
    Extended range VLAN (VLANs 1006 to 4094) Propagation
    Private VLAN support
    an propagate MST protocol database
    VTP Primary Server and VTP Secondary Servers
    Turn VTP On or Off on a per-trunk (per-port) basis
  21. 21how can you enable vtp on a single interface?SW1(config)# int gig0/0
    SW1(config-if)# vtp
  22. 22How can you verify VTP?SW1# show vtp counters
  23. 23how can you see VTP devices?SW1# show vtp devices
    (DOES NOT WORK IN TRANSPARENT MODE)
  24. 24What is VTP pruning?VTP pruning blocks unneeded flooded traffic to VLANs on trunk ports that are included in the pruning-eligible list. Only VLANs included in the pruning-eligible list can be pruned.
    Without VTP pruning, a switch floods broadcast, multicast, and unknown unicast traffic across all trunk links within a VTP domain even though receiving switches might discard them.
  25. 25Where does VTP prouning not work?in Vlans 1002 and higher,
    when switches are in transparent mode
  26. 26how do you turn vtp pruning on?SW2(config)# vtp pruning
  27. 27How is VTP pruning different across the different VTP versions?With VTP versions 1 and 2, when you enable pruning on the VTP server, it is enabled for the entire VTP domain. In VTP version 3, you must manually enable pruning on each switch in the domain.
  28. 28how can you configure what vlans are pruned on an interface?SW2(config)# interface e0/0
    SW2(config-if)# switchport trunk pruning vlan ?
  29. 29how can you remove vlan pruning from an interface?SW2(config)# interface e0/0
    SW2(config-if)# switchport trunk pruning vlan remove 10-15
  30. 30how can you add vlan pruning to an interface?SW2(config)# interface Ethernet0/0
    SW2(config-if)# switchport trunk pruning vlan add 10-15
  31. 31In 802.1q, what vlan must match on both switchesthe native vlan
    (802.1q doesn't tag the native vlan)
  32. 32How many STP instances do cisco switches use for vlans on trunks?1 for each vlan
    (careful when mixing, as some non-cisco switches only use 1 instance period)
  33. 33what can occur when native vlans for an 801.2 trunk don't match on both sides of the trunk?STP loops can occur
  34. 34What can happen if you disable spanning tree on the native vlan of a trunk but not on every vlan?STP loops
  35. 35Can a trunk be a secure port?no
  36. 36Can a trunk be a tunnel port?no
  37. 37can a trunk be grouped into an ether channel/yes, but only if all ports are also trunks and have the same configuration
  38. 38What is DTP?Dynamic Trunking Protocol
    assists in forming trunks
    (Don't confuse with VTP that informs about vlan changes)
  39. 39What are the 5 trunking interface modes with DTP enabled?access (doesn't trunk)
    dynamic auto (will trunk if neighbor is desirable to trunk)
    dynamic desirable (tries to trunk all the time)
    trunk (permanent trunk)
    nonegotiate (doesn't send DTP frames)
  40. 40how can you see if an interface is currently trunking?sh int trunk
  41. 41Where is DTP not supported?on private vlans and tunnel ports
  42. 42how do you specify a trunking protocol encapsulation type?switchport trunk encapsulation
  43. 43what must you check to see if a trunk port is operating the way you configured it?SW1# show interface switchport
    Administrative Mode: dynamic auto
    Operational Mode: static access
  44. 44how can you see all the DTP info about an interface?sh dtp interface
  45. 45what parameters must be agreed upon before two ports can trunk?The trunking mode
    Native VLAN
    Allowed VLANS
  46. 46Can tagged and non-tagged ports exist in the same VLAN group?yes.
    there are two modes: tagging mode
    nontagging mode (default)
  47. 47what is 802.1q tagging mode?VLAN frames are encapsulated and tagged. explicit header tells what VLAN frame belongs to.
  48. 48Can an untagged port in a vlan read tagged frames?Yes, but it can't insert its own tags.
  49. 49what is nontagging mode?default tagging mode, used for when endstations don't support 802.1Q. Any traffic transmitted from a nontagging port will not be tagged, even if devices behind that port support tagging.
  50. 50does 802.1q tag frames on the native vlan?nope
    It tags all other frames that are transmitted and received on the trunk.
  51. 51What is MST?Mono Spanning Tree
    IEEE 802.1Q defines a single instance of spanning tree that runs on the native VLAN for all the VLANs in the network
  52. 52What is a native vlan used for?controll traffic that is untagged
  53. 53What happens to any untagged frames received on a trunk port?They're put in the native vlan
  54. 54What is the purpose of VTP pruning?To cut down on uncessary VTP traffic like unkown unicasts and broadcasts that are flooded over an entire vlan
  55. 55How do you prune vlans?By telling a trunk what VLANS are allowed to traverse it
  56. 56What happens to a a trunk port when VTP detects a new VLAN?The trunk port automatically becomes a member of that VLAN if the VLAN is in the allowed range or list of VLANS
  57. 57how can you remove (prune) a vlan (or group of vlans) from an interface?SW1(config-if)# switchport trunk pruning vlan remove
  58. 58how can you add vlans back to an interface?SW1(config-if)# switchport trunk pruning vlan add
  59. 59If a VLAN is not enabled on a trunk, will data frames from that vlan every pass?Nope. Regardless of pruning.
  60. 60What must you watch out for when explicitly allowing vlans on a trunk?By saying "allow vlans 7-9" you are implicitly NOT allowing all vlans outside of this range.

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Description
CWNA Networking (CCNP Switch Exam Topics) Flashcards on 1.4 Configure and verify trunking, created by Dustin Sanders on 21/01/2017.
Created by
Dustin Sanders · Jan 2017
Updated
Feb 3, 2018
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  • Created by Dustin Sanders · Jan 21, 2017
  • Copied by Dustin Sanders · Jan 21, 2017
  • Copied by Dustin Sanders · Jan 21, 2017
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