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1.1 Configure and verify Switch administration

Dustin Sanders Networking CWNA Inglés 70 fichas

Fichas del conjunto (70)

  1. 1What is SDM and what does it used for?SDM (Switch Database Management) templates are used to optimize system resources on certain switch platforms.
  2. 2What is TCAM?(ternary content-addressable memory) is a specialized type of high-speed memory that searches its entire contents in a single clock cycle
  3. 3What happens on a switch when a particular resource is full?Processing overflow is sent to CPU for processing which results in a major performance hit
  4. 4What are some SDM templates?Access: Maximizes resources for ACLs
    Routing: Maximizes resources for routing
    Default: provides balance to all functions
    VLAN: Maximizes VLAN config with NO routing supported in hardware
  5. 5Which SDM template is assigned by default?the default template...
  6. 6When changing the SDM template, what must you do to a switch before your changes take affect?reload
  7. 7What is the command to change the SDM template globally?sdm prefer
    wr (or copy run start)
    reload
  8. 8How can you verify the SDM template in use?sh sdm prefer
  9. 9How can you verify the resources used by a specific SDM template?sh sdm prefer
  10. 10What types of SDM templates support both IPv4 and IPv6?Dual templates
  11. 11If you configure an SDM template on a Stack Master, what happens to all the other SDM templates on the stack slaves?They get overridden
  12. 12How do you return an SDM template back to the default?no sdm prefer
  13. 13What does a switch do when it gets a frame that's source address isn't in its table?It adds the source address, the port, and the vlan to it's table
  14. 14If a switch gets a frame with a destination address it doesn't know, what does it do?Floods it.
    unknown unicast flood
  15. 15what happens to frames containing a broadcast or mulitcast destination address?They are always flooded
  16. 16what is the ipv4 ethernet broadcast address?ffff.ffff.ffff
  17. 17what does ipv4 multicast addresses start with?01xx.xxxx.xxxx
    (ipv6 begin with 3333.xxxx.xxxx)
  18. 18What is CAM?Content-addressable memory (CAM) is a special type of memory used in certain very-high-speed searching applications.
  19. 19What is the L2 forwarding table?frame’s destination MAC address is used as an index in CAM table.
    If the address is found, the egress switch port and the appropriate VLAN ID are read from the table. If the address is not found, the frame is marked for flooding so that it is forwarded out every switch port in the VLAN.
  20. 20what is default aging time of CAM table entries?300 seconds
    or 5 minutes
  21. 21How do you change the default aging time of the CAM table?Switch(config)# mac address-table aging-time seconds
  22. 22What does it mean if a MAC address is "flapping" between different interfaces?A switch is seeing a MAC address come in on different ports when it should only be coming in on 1
  23. 23How is CAM and TCAM differentCAM is binary
    TCAM has a third matching state "X" or "don't care"
    z.B: 10XX0 could match the following:
    "10000”, “10010”, “10100”, or “10110”
  24. 24What is an ACE?Access Control Entry, used to build ACLs
  25. 25At what layers do CAM and TCAM operate?CAM = L2
    TCAM = L2/L3
  26. 26Where are ACLs processed?in hardware (TCAM)
  27. 27What are the 2 components of TCAM?Feature Manager (FM): After an access list has been created or configured, the Feature Manager software compiles the ACEs into entries in the TCAM table. The TCAM then can be consulted at full frame-forwarding speed.
    Switching Database Manager (SDM): On some Catalyst switch models, the TCAM is partitioned into several areas that support different functions. The SDM software configures or tunes the TCAM partitions, if needed, to provide ample space for specific switching functions. (The TCAM is fixed on Catalyst 4500 and 6500 platforms and cannot be repartitioned.)
  28. 28What is a TCAM entry composed of?VMR
    Values (134bit quantities)
    Masks(134 bit quantities)
    Results (numeric values that represent what action to take after the TCAM lookup occurs. Whereas traditional access lists offer only a permit or deny result, TCAM lookups offer a number of possible results or actions)
  29. 29how can you see the learned mac addresses in the address table?Switch# show mac address-table dynamic
  30. 30How can you see all the MAC addresses learned on a single interface?Switch# show mac address-table dynamic interface
  31. 31How can you see the CAM table’s sizeSwitch# show mac address-table count
  32. 32How can you manually clear a CAM table entry?Switch# clear mac address-table dynamic [address mac-address | interface type mod/num | vlan vlan-id]
  33. 33How can you see TCAM resource utilization?Switch# show platform tcam utilization
  34. 34What is the FIBForwarding Information Base
    (Just another name for CAM table)
  35. 35What is the function of err-disableIf the configuration shows a port to be enabled, but software on the switch detects an error situation on the port, the software shuts down that port
  36. 36What are some things that cause a port to be put in err-disable mode?duplex mismatch
    BPDU guard violation
    security violation
    flapping
    inline power issues
    frame collisions
  37. 37how do you turn off error disable for a specific situationno errdisable detect cause
  38. 38how can you show the errdisable status?sh errdisable detect
  39. 39if errdisable recovery is enabled, how can you see the cause of an errdisabled port?sh errdisable recovery
  40. 40what must be done before you recover an errdiabled port?fix the root problem or else it will just errdisable again
  41. 41What should you check if a port in an etherchannel is put in errdisable?check that both sides are set to "desirable" to form a channel
  42. 42What are the defaults of errdisable?recovery disabled for all causes
    detection enabled for all causes
    default recovery time 300 seconds
  43. 43how can you see all the interfaces that are err-disabled?sh errdisable recovery
  44. 44how can you change the errdisable recovery time?witch(Config)# errdisable recovery interval
  45. 45What gets returned to CDP advertisements?nothing. There is no ACK. It's a 1 directional multicast
  46. 46At what layer does CDP operate?Layer 2 only
  47. 47What 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.
  48. 48What is the Ethernet Multicast for CDP and VTP?01-00-0C-CC-CC-CC
    (field type 0x0802)
  49. 49What is the Ethernet Multicast for STP?01-80-C2-00-00-00
  50. 50How 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
  51. 51What are TLVs?Type-Length-Value fields (TLVs)
    blocks of info in a CDP advertisement:
    Device ID
    Address
    Port ID
    Capabilities
    platform
    (etc)
  52. 52How can you configure the frequency of CDP advertisements?Router(config)# cdp timer seconds
    Router(config)# cdp holdtime seconds
  53. 53how do you enable cdp? how do you disable cdp?Router(config)# cdp run
    Router(config)# no cdp run
  54. 54how can you clear cdp counters?Router# clear cdp counters
  55. 55how do you clear the cdp table?Router# clear cdp table
  56. 56how 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
  57. 57how do you find out detail on all your cdp neighbors?show cdp neighbors detail
  58. 58how can you see cdp traffic?sh cdp traffic
  59. 59what 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
  60. 60what advantage does LLDP have over CDP with Voip?LLDP supports additional TLVs that are unique to audio/visual devices like VoIp phones
    LLDP-MEDTLVs
  61. 61how do you see if LLDP is running?sh lldp
  62. 62how do you enable lldp?lldp run
    (no lldp run to disable)
  63. 63what are the mandatory LLDP TLVsPort description TLV
    System name TLV
    System description
    System capabilities TLV
    Management address TLV
  64. 64what 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.
  65. 65what is the default lldp update frequency?30 seconds
    (half that of CDP)
  66. 66how do you disable lldp globally?no lldp run global
  67. 67how 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
  68. 68how 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
  69. 69how do you clear lldp counters?Switch# clear lldp counters
  70. 70How do you clear lldp tables?Switch# clear lldp table

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CWNA (CCNP Switch Exam Topics) Networking Fichas sobre 1.1 Configure and verify Switch administration, creado por Dustin Sanders el 21/01/2017.
Creado por
Dustin Sanders
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  • Creado por Dustin Sanders · 21 ene 2017
  • Copiado por Dustin Sanders · 21 ene 2017
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