CH14 VOICE VLANS

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Author:
mrlarios
ID:
228113
Filename:
CH14 VOICE VLANS
Updated:
2013-07-25 01:46:19
Tags:
voice vlans ip phone qos
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Description:
CCNP VOICE VLANS
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  1. What modes do the ports in a Cisco IP Phone function in?
    • The voice and user PC ports always function as access-mode switch ports.
    • The port that connects to the upstream switch, however, can operate as an 802.1Q trunk or as an access mode(single VLAN) port.
  2. True or false:The link mode between the IP Phone and the switch is negotiated.
    True.
  3. What are the advantages of using a the 802.1Q trunk between a switch and a phone?
    The voice traffic can be isolated from other user data, providing security and QoS capabilities.
  4. What is the advantage and disadvantage of using an access link between switch and phone?
    Both voice and data must be combined over the single VLAN. This simplifies other aspects of the switch configuration because a separate voice VLAN is not needed, but it could compromise the voice quality, depending on the PC application mix and traffic load.
  5. What types of VLANs do voice packets have to be carried in and what are those VLANs known as?
    • The voice packets must be carried over a unique voice VLAN (known as the voice VLAN ID or VVID) or
    • Over the regular data VLAN (known as the native VLAN or the port VLAN ID, PVID). The QoS information from the voice packets also must be carried.
  6. How is an IP Phone uplink trunk configured?
    • The switch instructs the phone to follow the mode that is selected (access or trunk).
    • The switch port does not need any special trunking configuration commands if a trunk is wanted.
    • If an 802.1Q trunk is needed, a special-case trunk automatically is negotiated by the Dynamic Trunking Protocol (DTP) and the Cisco Discovery Protocol (CDP).
  7. Name the command to select the voice VLAN mode that will be used.
    Switch(config-if)# switchport voice vlan {vlan-id | dot1p | untagged | none}

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