ccnp sw ch 15

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boultonm
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243309
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ccnp sw ch 15
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2013-11-09 06:24:02
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ch 15
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  1. Which one of the following standard sets is used in wireless LANs?

    a. IEEE 802.1
    b. IEEE 802.3
    c. IEEE 802.5
    d. IEEE 802.11
    d
  2. Which one of the following methods is  used to minimize collisions in a wireless LAN?

    a. CSMA/CD
    b. CSMA/CA
    c. LWAPP
    d. LACP
    b
  3. A wireless scenario is made up of five wireless clients and two APs connected by a switch.  Which one of the following correctly describes the wireless network.  

    a. BSS
    b. ESS
    c. IBSS
    d. CBS
    b
  4. If a wireless access point is connected to a switch by a trunk port, which one of the following is mapped to a VLAN?

    a. Channel
    b. Frequency
    c. BSS
    d. SSID
    d
  5. Which of the following terms represents a Cisco wireless access point that cannot operate independently?

    a. Autonomous AP
    b. Roaming AP
    c. Lightweight AP
    d. Dependent AP
    c
  6. Suppose that an autonomous AP is used to support wireless clients. Which one of the following answers lists the devices that traffic must take when passing from one wireless client to another?

    a. Through the AP only
    b. Through the AP and its controller
    c. Through the controller only
    d. None of these answers is correct; traffic can go directly over the air
    a
  7. Suppose that a lightweight AP is used to support wireless clients. Which one of the following answers lists the device path that traffic must take when passing from one wireless client to another?

    a. Through the AP only
    b. Through the AP and its controller
    c. Through the controller only
    d. None of these answers is correct; traffic can go directly over the air
    b
  8. A lightweight access point is said to have which one of the following architectures?

    a. Proxy MAC
    b. Tunnel MAC
    c. Split-MAC
    d. Fat MAC
    c
  9. How does a lightweight access point communicate with a wireless LAN controller?

    a. Through an IPsec tunnel
    b. Through an LWAPP or CAPWAP tunnel
    c. Through a GRE tunnel
    d. Directly over Layer 2
    b
  10. Which one of the following types of traffic is sent securely over an LWAPP tunnel?

    a. Control messages
    b. User data
    c. DHCP requests
    d. 802.11 beacons
    a
  11. Which one of the following must be consistent for a wireless client to roam between lightweight APs that are managed by the same WLC?

    a. SSID
    b. Mobility group
    c. VLAN ID
    d. Mobility group
    a
  12. Which one of the following must be consistent for a wireless client to roam between lightweight APs that are managed by two different WLCs?

    a. VLAN ID
    b. SSID
    c. AP management VLAN
    d. Mobility group
    d
  13. Which one of the following locations is appropriate for an LAP?

    a. Access-layer switch port
    b. Distro-layer switch port
    c. Core-layer switch port
    d. Data center switch port
    a
  14. Which one of the following locations is appropriate for a WLC?

    a. Access-layer switch port
    b. Distro-layer switch port
    c. Core-layer switch port
    d. Data center switch port
    b
  15. Which one of the following is the correct switch config for a port connected to an LAP?

    a. switchport mode trunk
    b. switchport mode lap
    c. switchport mode access
    d. switchport mode transparent
    c
  16. Suppose an LAP/WLC combination is used to provide connectivity from SSID "staff" to VLAN 17. Which one of the following is the correct extent for the VLAN?

    a. VLAN 17 exists on the LAP only
    b. VLAN 17 extends from the LAP to the access switch only
    c. VLAN 17 extends from the LAP to the WLC
    d. VLAN 17 extends from the LAP to the access switch and from the distro switch to the WLC
    d
  17. Describe an IBSS (Independent Basic Service Set) network.
    AKA ad-hoc.  Where computers talk to each other and no network gear is involved.  (no APs or switches)
  18. Describe BSS (Basic Service Set)
    Where wireless clients talk to each other through a single access point. 

    • Requires the following:
    • matching SSID
    • compatible wireless rate
    • authentication credentials
  19. Describe a ESS (Extended Service Set)
    Where the supporting network has both wireless and wired capabilities.  allows for multiple APs with a single SSID and multiple APs with multiple SSIDs.
  20. Describe the difference between Layer 2 and Layer 3 roaming.
    L2 - client maintains the same IP address while roaming.

    L3 - APs have different IP subnets.
  21. Define  autonomous mode AP.
    where each AP is a standalone device.
  22. Describe the VLAN to SSID relationship
    Each SSID can be associated with only one VLAN.   

    So, VLAN (wired) = SSID (wireless)
  23. in a traditional wireless network having multiple SSID/VLAN associations and more than one autonomous AP,

    What is used to carry the different VLANS from the APs to the Switch?
    802.1Q trunk links.

    But in a large wireless network,  each AP must be manually controlled (aka, accessed, configured, all changes must match) 
  24. Describe Cisco unified wireless network.
    LAP (Lightweight Access Point) performs the real-time 802.11 operations. 

    the LAP has 2 tunnels to a WLC (Wireless LAN Controller).  


    • 2 tunnels:
    • 1.  Control Messages (LAP config and management)
    • 2. Data 
  25. What are the 2 tunnels available for LAP to WLC connectivity?
    LWAPP  (LightWeight Access Point Protocol) Cisco developed.


    CAPWAP (Control and Provisioning Wireless Access Points protocol) based on Cisco design, open standard.
  26. What functions are done (offloaded to the WLC from the LAP) by the WLC in a unified wireless environment?
    • Dynamic channel assignment
    • Transmit power otimization
    • Self-healing wireless coverage
    • Flexible client roaming
    • Dynamic client load balancing
    • RF monitoring
    • Security Management
  27. What is HREAP?
    Hybrid Remote Edge Access Point  - used when a WAN seperates the LAP from the WLC.

    Allows for the LAP to keep functioning until the WAN link is restored.
  28. detail CLI for a switchport to support a autonomous AP.
    • G int gi 1/0/1
    • I  switchport trunk encap dot1q
    • I  switchport trunk allowed vlan 10,20,30
    • I  switchport mode trunk
    • I  spanning-tree portfast trunk

    takeaway:  standalone APs use a trunk to get data to a switch.
  29. detail CLI for a switchport to support a LAP.
    • G vlan 100
    • V name ap-management
    • V exit
    • G int gi 1/0/10
    • I switchport
    • I switchport access vlan 100
    • I switchport mode access
    • I spanning-tree portfast
    • I power inline auto
    • I exit

    takeaway: LAPs use access link for the link from LAP to Switch. 

    From switch to WLC is a trunk.  Depending on volume of traffic, can be a etherchannel.
  30. detail CLI for link from Switch to WLC
    • G int range gi 1/0/41 - 44
    • I switchport
    • I channel-group 1 mode on
    • I exit
    • G interface port-channel 1
    • I switchport trunk encap dot1q
    • I switchport trunk allowed vlan 10,20,30
    • I spanning-tree portfast trunk
    • I no shut
    • I exit

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