Which of the following statements are TRUE regarding the building of a QoS-enabled network? (Choose two)

Question

Options

• AIt is important that all packets are classified in the same way at all SAP-ingress points.
• BOnce a packet is classified to a forwarding class, it cannot change across the network.
• CPacket enters a node will be treated as per the local hop's configured policy.
• DNative IP packets entering a network port will be marked at the first network egress by default
• ENative IP packets entering a network port will not be marked at the first network egress by default.
• FNative IP packets entering a network port will be marked at the first network egress, regardless of

• C
  86% (18)
• D
  10% (2)
• F
  5% (1)

Explanation

QoS Network Behavior - Explanation

C is correct because QoS operates on a hop-by-hop basis: each node applies its own locally configured policy independently. A packet's forwarding treatment at any given node is determined solely by that node's ingress/egress policy, regardless of how upstream nodes treated it.

E is correct because in Nokia SR OS (the platform this question targets), native IP packets arriving on a network port are not re-marked by default at the first network egress. Marking must be explicitly enabled via a network egress QoS policy - the default behavior is to preserve existing DSCP markings.

Why the distractors fail:

• A is false - different SAPs can legitimately use different classification policies depending on the customer or service; uniform classification is a design goal, not a requirement.
• B is false - forwarding class assignments are local to each node; a packet can be reclassified at any subsequent hop.
• D is the direct opposite of E - it incorrectly claims marking happens by default.
• F is incomplete as written, but the absolute claim ("regardless of...") makes it false regardless; marking at egress always depends on policy configuration.

Memory tip: Think "Local Hops, No Default Stamps" - each hop enforces its own local policy (C), and packets don't get stamped (marked) at network egress unless you configure it (E).

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