Based on the provided configuration, let's analyze each term to determine the correct forwarding class and acceptance of traffic:
* Term 1:
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term 1 {
from {
protocol udp;
port [ 16000 16002 ];
}
then {
loss-priority high;
forwarding-class voice;
}
}
This term specifies that UDP traffic on ports 16000 and 16002 is assigned a high loss priority and placed in the
"voice" forwarding class. The action does not include an explicit "accept;" statement, but traffic matching this term will be forwarded according to the specified forwarding class and priority.
* Term 2:
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term 2 {
from {
protocol tcp;
port 4423;
}
then {
loss-priority low;
forwarding-class best-effort;
accept;
}
}
This term specifies that TCP traffic on port 4423 is assigned a low loss priority and placed in the "best-effort" forwarding class. It explicitly includes an "accept;" statement, meaning this traffic will be accepted and processed according to these parameters.
* Term 3:
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term 3 {
from {
protocol tcp;
port [ 22 80 443 ];
}
then {
forwarding-class af;
}
}
This term specifies that TCP traffic on ports 22 (default SSH port), 80 (HTTP), and 443 (HTTPS) will be placed in the "af" forwarding class. There is no explicit "accept;" statement here, but the traffic matching this term will be forwarded according to the specified forwarding class.
* Term 4:
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term 4 {
then {
forwarding-class best-effort;
accept;
}
}
This term applies to any traffic that does not match the previous terms. Such traffic will be placed in the
"best-effort" forwarding class and explicitly accepted.
* Statement A: "SSH traffic using the default port will be placed in the af forwarding class and accepted."
* Correct. Term 3 matches TCP traffic on port 22 (default SSH port) and assigns it to the "af" forwarding class. Although "accept" is not explicitly stated, the traffic is forwarded based on this class.
* Statement B: "SSH traffic using the default port will be placed in the best-effort forwarding class and accepted."
* Incorrect. The default SSH port (22) matches Term 3, which places it in the "af" forwarding class, not "best-effort."
* Statement C: "UDP traffic using the 16000 port will be placed in the voice forwarding class and accepted."
* Correct. Term 1 matches UDP traffic on port 16000 and places it in the "voice" forwarding class.
Although "accept" is not explicitly stated, the traffic is processed based on the forwarding class and priority.
* Statement D: "UDP traffic using the 16000 port will be placed in the best-effort forwarding class and accepted."
* Incorrect. UDP traffic on port 16000 matches Term 1, which places it in the "voice" forwarding class, not "best-effort."
* Juniper Networks Configuration Guidelines and Command References
* Detailed command references from the uploaded files, particularly those related to firewall and CoS configurations.
Analysis:References:

* Understanding the Problem:
* The issue involves voice packets being dropped in a newly implemented VoIP network.
* Voice packets are marked correctly for the expedited forwarding (EF) queue, indicating that classification is working as intended.
* Dropped packets suggest that there may be insufficient resources allocated to handle the traffic in
* the EF queue.
* Key Concepts:
* Classifiers: These are used to mark packets so that they can be placed into the appropriate forwarding class. This step is already correctly implemented as indicated by the problem statement.
* Rewrite Rules: These ensure that packets retain their markings as they transit the network, but this is not the issue here as packets are already marked correctly.
* Policers: These control the rate of traffic to ensure it does not exceed specified limits, but policing is not required here as the issue is with packet drops due to insufficient resources.
* Schedulers: These allocate resources (bandwidth, priority) to different queues to ensure that high-priority traffic (like VoIP) is transmitted with minimal delay and packet loss.
* Solution: Configuring a Scheduler:
* To prevent the EF queue from being starved of resources and to ensure voice packets are not dropped, you need to configure a scheduler. This scheduler will allocate appropriate bandwidth and priority to the EF queue.
* Configuring Scheduler on Juniper Devices:
* Here is a sample configuration to allocate bandwidth to the expedited forwarding queue:
set class-of-service schedulers voip-scheduler transmit-rate percent 20 set class-of-service schedulers voip-scheduler priority strict-high set class-of-service forwarding-classes queue 1 expedited-forwarding set class-of-service forwarding-classes queue 1 scheduler voip-scheduler
* In this configuration:
* The voip-scheduler is set to allocate 20% of the bandwidth and is given strict-high priority to ensure voice packets are transmitted with the highest priority.
* The EF queue (queue 1) is associated with the voip-scheduler.
* Verification:
* Ensure the scheduler is applied and active on the interfaces handling the VoIP traffic.
* Monitor the interface statistics to ensure that packet drops are minimized and voice quality issues are resolved.
References:
* Juniper Networks Documentation on Class of Service
* Configuring Schedulers

For a device configured for 802.1X authentication, specify that when the device receives an Extensible Authentication Protocol Over LAN (EAPoL) Access-Reject message during the authentication process between the device and the RADIUS authentication server, supplicants attempting to access the LAN are granted access and moved to a specific bridge domain or VLAN. Any bridge domain, VLAN name or VLAN ID sent by a RADIUS server as part of the EAPoL Access-Reject message is ignored.