JN0-102 · Question #382
Which two firewall filter actions will affect a packet's class-of-service setting? (Choose two.)
The correct answer is C. forwarding-class D. loss-priority. In Junos firewall filters, the forwarding-class and loss-priority actions are used to classify traffic for Class of Service (CoS), directly influencing how packets are handled in terms of priority and potential discard probability.
Question
Which two firewall filter actions will affect a packet's class-of-service setting? (Choose two.)
Options
- Ascheduler
- Bqueue
- Cforwarding-class
- Dloss-priority
How the community answered
(61 responses)- A3% (2)
- B8% (5)
- C89% (54)
Why each option
In Junos firewall filters, the `forwarding-class` and `loss-priority` actions are used to classify traffic for Class of Service (CoS), directly influencing how packets are handled in terms of priority and potential discard probability.
`scheduler` defines how queues transmit traffic, but it is not a direct firewall filter action that modifies a packet's CoS settings.
`queue` is typically used in CoS configurations to specify a specific output queue, but it's not a direct firewall filter action to classify a packet's CoS parameters.
The `forwarding-class` action assigns a packet to a specific forwarding class, which dictates its treatment in the CoS queueing and scheduling system.
The `loss-priority` action sets the packet's loss priority, indicating its discard eligibility during congestion within a CoS queue.
Concept tested: Junos firewall filter CoS actions
Source: https://www.juniper.net/documentation/us/en/software/junos/firewall-authentication/firewall-filters/topics/ref/statement/firewall-filter-action-modifying-fields-in-packet-header.html
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