Within the service provider core network, which two QoS mechanisms are typically deployed on
the P routers? (Choose two.)
A.
LLQ
B.
traffic policing and remarking
C.
WRED
D.
traffic shaping
E.
traffic classification and markings
F.
link fragmentation and interleaving
Explanation:
Core P router QoS requirements – queuing and dropping are done in the core, based on packet marking done at the edge; two methods for QoS design, 1) Best Effort with overprovisioning (expensive), 2) DiffServ backbone (commonly used); offering different SLAs for different traffic classes can greatly reduce the cost, improve delay, jitter, and packet loss, and meet network QoS requirements; congestion avoidance and management are used on P routers output interfaces; P router input interface does not need to have any QoS policy applied
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