Exam JN0-649 topic 1 question 38 discussion

EX Series switches can accommodate an IP telephone and end host connected to a single switch port. In such a scenario, voice and data traffic must be separated into different broadcast domains, or VLANs. One method for accomplishing this is by configuring a voice VLAN, which enables access ports to accept untagged data traffic as well as tagged voice traffic from IP phones, and associate each type of traffic with separate and distinct VLANs. Voice traffic (tagged) can then be treated differently, generally with a higher priority than data traffic (untagged)

A is not correct. LLDP-MED is useful for voice vlan but it is not a must. The voice VLAN delivers the greatest benefit when used with IP phones that support LLDP-MED, but it is flexible enough that IP phones that do not support LLDP-MED can also use it effectively. However, in the absence of LLDP-MED, the voice VLAN ID must be set manually on the IP phone because LLDP-MED is not available to accomplish this dynamically. For information about setting up a voice VLAN for IP phones that support LLDP-MED,

When using the voice VLAN feature on Juniper EX Series switches, the goal is to separate voice and data traffic while ensuring proper Quality of Service (QoS) for VoIP. 1. B. The interfaces must be configured as access ports (✅ Correct) The switch port should be configured as an access port, not a trunk. The voice VLAN feature allows the port to accept tagged voice traffic (802.1Q) from the IP phone, while untagged data traffic from the computer remains in the native VLAN. 2. C. Assigning the incoming voice and data traffic to separate VLANs enables the ability to prioritize the traffic using CoS (✅ Correct) By placing voice and data in separate VLANs, you can apply Class of Service (CoS) policies to prioritize voice traffic, reducing latency and jitter. Voice traffic typically gets higher priority (802.1p DSCP values like EF - Expedited Forwarding) to ensure smooth communication.

ab correct

Should be A and B