4A0-107 · Question #51
If a packet is marked on a SAP-ingress, it will be remarked at the first network egress point (if remarking is enabled in the network egress policy).
The correct answer is B. FALSE. Option B (FALSE) is correct because in Nokia SR OS, a packet marked at SAP-ingress is assigned an internal Forwarding Class (FC) and profile - but this internal classification does not cause automatic remarking at the first network egress point. Network egress remarking is…
Question
If a packet is marked on a SAP-ingress, it will be remarked at the first network egress point (if remarking is enabled in the network egress policy).
Options
- ATRUE
- BFALSE
How the community answered
(47 responses)- A26% (12)
- B74% (35)
Explanation
Option B (FALSE) is correct because in Nokia SR OS, a packet marked at SAP-ingress is assigned an internal Forwarding Class (FC) and profile - but this internal classification does not cause automatic remarking at the first network egress point. Network egress remarking is governed independently by the network egress QoS policy, which rewrites DSCP or MPLS EXP bits based on FC/profile for traffic exiting that interface; it is not triggered by, nor exclusive to, packets that were marked at SAP-ingress. Option A is wrong because it implies a direct causal link between SAP-ingress marking and network egress remarking - those are two separate, independent QoS operations that do not depend on each other. Memory tip: Think of SAP-ingress as the "classifier" (sets internal labels) and network egress as the "re-labeler" (sets header bits on the wire) - they work in parallel pipelines, not in a triggered sequence.
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