View the exhibit.

A network administrator configures the HP 2610-24-PoE switch as shown in the exhibit.
Computers belong to the data VLAN, which is VLAN 10. IP phones should transmit traffic on VLAN

20. They should be able to connect to any port and use LLDP-MED to obtain their VLAN
assignment. However, IP phones connected to this switch cannot reach the VoIP server and are
not functioning correctly. IP phones connected to other switches are functioning correctly. What
must the network administrator do?

A.
Make VLAN 20 untagged on the ports into which phones are connected.

B.
Define VLAN 20 as a voice VLAN.

C.
Enable LLDP-MED globally.

D.
Enable LLDP-MED on the ports into which phones are connected.

Explanation:
VLAN Operating Rules. These rules affect advertisements of VLANs in
network policy TLVs:
* The VLAN ID TLV subelement applies only to a VLAN configured for voice
operation (vlan < vid > voice).
* If there are multiple voice VLANs configured on a port, LLDP-MED
advertises the voice VLAN having the lowest VID.
* The voice VLAN port membership configured on the switch can be tagged
or untagged. However, if the LLDP-MED endpoint expects a tagged membership when the switch port is configured for untagged, or the reverse,
then a configuration mismatch results.
Note:
* LLDP-MED provides auto-deployment of layer 2 and layer 3 QoS policies
CDP configures only the voice VLAN (IP precedence and COS are hard coded)
* The LLDP-MED standard provides support for auto-deployment of streaming multicast and/or
video conferencing
It supports multiple convergence policies on a given port for plug-and-play deployment with
compatible devices (e.g., plug-and-play video surveillance cameras)
* LLDP-MED provides detailed IP phone inventory management
The Ethernet switch collects model, manufacturing, software, firmware and asset information,
since few IP phones and video devices support SNMP
* LLDP was designed for easy extensibility
Organizationally specific (e.g., LLDP-MED within TIA) and private vendor extensions can be
added without concerns of new identifier conflicts to ensure future interoperability
* LLDP-MED provides multiple format location information concurrently
* LLDP-MED advertises endpoint power priority and backup power conservation
This enables future capability for phones and other devices to conserve power and disable noncritical functions to extend battery backup power life during emergency situations