ccnp sw ch 6

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  1. If Fast Ethernet ports are bundled into an EtherChannel, what is the maximum throughput supported on a Catalyst switch?
    a.       100Mbps
    b.      200 Mbps
    c.       400 Mbps
    d.      800 Mbps
    e.      1600 Mbps
  2. Which of these methods distribute traffic over an EtherChannel?

    a.       Round robin
    b.      Least-used link
    c.       A function of address
    d.      Channel port
  3. What type of interface represents an EtherChannel as a whole?

    a.       Channel
    b.      Port
    c.       Port channel
    d.      Channel port
  4. Which of the following is not a valid method for EtherChannel load balancing?

    a.       Source MAC address
    b.      Source and destination MAC address
    c.       Source IP address
    d.      IP precedence
    e.      UDP/TCP port
  5. How can the EtherChannel load-balancing method be set?

    a.       Per switch port
    b.      Per Etherchannel
    c.       Globally per switch
    d.      Can’t be configured
  6. What logical operation is performed to calculate EtherChannel load-balancing as a function of two addresses?

    a.       OR
    b.      AND
    c.       XOR
    d.      NOR
  7. Which one of the following is a valid combination of ports for an EtherChannel?

    a.       Two access links (one VLAN5, one VLAN 5)
    b.      Two access links (one VLAN1, one VLAN 10)
    c.       Two trunk links (one VLANs 1 to 10, one VLANs 1, 11,to 20)
    d.      Two Fast Ethernet links (both full duplex, one 10 Mbps)
  8. Which of these is a method for negotiating an EtherChannel?

    a.       PAP
    b.      CHAP
    c.       LAPD
    d.      LACP
  9. Which of the following is a valid EtherChannel negotiation mode combination between two switches?
    a.       PAgP auto, PAgP auto
    b.      PAgP auto, PAgP desirable
    c.       On, PAgP auto
    d.      LACP passive, LACP passive
  10. When is PAgP’s “desirable silent” mode useful?

    a.       When the switch should not send PAgP frames
    b.      When the switch should not form an EtherChannel
    c.       When the switch should not expect to receive PAgP frames
    d.      When the switch is using LACP mode
  11. Which of the following EtherChannel mmodes does not send or receive any negotiation frames?

    a.       channel-group 1 mode passive
    b.      channel-group 1 mode active
    c.       channel-group 1 mode on
    d.      channel-group 1 mode desirable
    e.      channel-group 1 mode auto
  12. Two computers are the only hosts sending IP data across an EtherChannel between two switches. Several different applications are being used between them. Which of these load-balancing methods would be more likely to use the most links in the EtherChannel?

    a.       Source and destination MAC addresses
    b.      Source and destination IP addresses
    c.       Source and destination TCP/UDP ports
    d.      None of the above
  13. Which command can be used to see the status of an EtherChannel’s links?

    a.       show channel link
    b.      show etherchannel status
    c.       show etherchannel summary
    d.      show ether channel status
  14. Can Etherchannels can be an access or trunk link or both (not at the same time)?
    Either one.
  15. What discriminators can the switch use during traffic distro over an etherchannel link?
    • 1. source IP address, destination IP address, or a combo source and dest IP address.
    • 2. source MAC address, dest MAC address, or combo.
    • 3. source port number, dest port number, or combo.
  16. describe hashing operation for etherchannel load balancing for the following:

    a. src-ip
    b. dst-ip
    c. src-dst-ip
    d. src-mac
    e. dst-mac
    f. src-dst-mac
    g. src-port 
    h. dst-port
    i. src-dst-port
    • a. src-ip            bits
    • b. dst-ip           bits
    • c. src-dst-ip       XOR 
    • d. src-mac         bits
    • e. dst-mac        bits
    • f. src-dst-mac    XOR
    • g. src-port         bits
    • h. dst-port         bits
    • i. src-dst-port     XOR
  17. what cmd allows you to verify load balancing performance?
    show etherchannel port-channel

    look at hex "load" values and compare against other ports in the bundle.
  18. what are the 2 link aggregation protocols?

    Which one is Cisco proprietary?
    PAgP   port aggregation protocol   cisco proprietary

    LACP   Link aggregation protocol   IEEE 802.3ad  (aka 802.3 clause 43)
  19. describe etherchannel negotiation using PAgP.
    On.     no negotiation packets sent.  all ports channeling.

    auto.  yes to negotiation packets sent,   waits to be asked to channel.   

    desireable.  yes to negotiation packets sent,  actively asks to form a channel.
  20. describe etherchannel negotiation using LACP.
    On.     no negotiation packets sent.  all ports channeling.

    passive.  yes to negotiation packets sent,   waits to be asked to channel.   

    active.  yes to negotiation packets sent,  actively asks to form a channel.
  21. describe the roles in LACP endpoints.
    system priority, a 2 byte pri value with 6 byte MAC add.   lowest system pri makes decisions about what ports actively participate in the etherchannel.

    port priority,   a 2 byte pri with a 2 byte port number.   low value = high pri.  you can have up to 16 potential links, with 8 active. The rest are placed in standby.
  22. detail cli syntax to set up PAgP.
    • G  port-channel load-balance src-dst-port
    • G  int range gi0/0 - 4
    • I  channel-protocol pagp
    •    channel-group 1 mode (on, auto, desireable) non-silent
  23. detail cli syntax for LACP etherchannel.
    • G  lacp system-pri 100
    • G  int range gig 2/1 - 4, gig 3/1 - 4
    • I   channel-protocol lacp
    •     channel-group 1 mode active
    •     lacp port-pri 100
    •     exit
    • G  int range gig 2/5 - 8, gig 3/5 - 8
    •     channel-protocol lacp
    •     channel-group 1 mode active

    note:  above, interfaces 2/5-8, 3/5-8 have no pri.  left to default of 32,768.  This puts them into standby mode.
  24. what commands are used for troubleshooting etherchannel?
    • show etherchannel summary
    • show etherchannel port

    show etherchannel port-channel

    show etherchannel detail

    show etherchannel load-balance

    show pagp/lacp neighbor

    sh lacp sys-id
Card Set:
ccnp sw ch 6
2013-09-10 08:42:44

ch 6
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