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Question 103 - N10-008 discussion

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A network technician is investigating an IP phone that does not register in the VoIP system Although it received an IP address, it did not receive the necessary DHCP options The information that is needed for the registration is distributes by the OHCP scope All other IP phones are working properly. Which of the following does the technician need to verify?

A.
VLAN mismatch
Answers
A.
VLAN mismatch
B.
Transceiver mismatch
Answers
B.
Transceiver mismatch
C.
Latency
Answers
C.
Latency
D.
DHCP exhaustion
Answers
D.
DHCP exhaustion
Suggested answer: A

Explanation:

A VLAN mismatch is the most likely reason why an IP phone does not receive the necessary DHCP options for registration. A VLAN mismatch occurs when a device is connected to a switch port that belongs to a different VLAN than the device’s intended VLAN. This can cause communication problems or prevent access to network resources. For example, if an IP phone is connected to a switch port that belongs to the data VLAN instead of the voice VLAN, it may not receive the DHCP options that contain information such as the TFTP server address, the NTP server address, or the default gateway address for the voice VLAN. These DHCP options are essential for the IP phone to register with the VoIP system and function properly. Reference:

https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified- communications-manager-callmanager/13979-dhcp-option-150-00.html

asked 02/10/2024
Dang Xuan Bao
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