Which statement is correct about CoS policers on Junos devices?
A.
Traffic that exceeds a policer’s traffic profile can be dropped or assigned to a specific drop profile.
B.
A policer can assign in-profile traffic to a specific forwarding class.
C.
A policer does not alter in-profile traffic.
D.
Policers can be configured to buffer traffic that exceeds the policer’s traffic profile.
Why not A ?
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Traffic that exceeds a policer’s traffic profile can set to a specified forwarding class, set to a specified loss priority, or both—or they can be discarded..this in Single-Rate Two-Color Policers.
https://www.juniper.net/documentation/en_US/junos/topics/concept/policer-types.html
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Correct answer is C:
https://www.juniper.net/documentation/en_US/junos/topics/concept/schedulers-priority-overview-cos-config-guide.html
When the transmitted amount is less than the allocated amount, the queue is considered to be in profile. A queue is out of profile when its transmitted amount is larger than its allocated amount.
Then, a policer does not alter in-profile traffic.
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When we talk about in/out profile traffics, we are talking about Scheduling only; the policers are performance before scheduling process, then policier are no involve in in-profile traffic.
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