Tag: Cisco 642-785

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QUESTION 82
When the RFC 3270 Short Pipe mode is used, the PHB at the egress router is based on which of these?
A. The topmost MPLS label EXP value.
B. The MPLS VPN label EXP value.
C. The Differentiated Services Field value in the IP packet header
D. The packet is re-evaluated, remarked, and the PHB is based on this new marking
Correct Answer: C Section: (none) Explanation
Explanation/Reference:

Short-Pipe mode is useful for ISPs implementing their own QoS policy independent of their customer’s QoS policy. The IP Precedence bits on an IP packet are propagated upward into the label stack as labels are added. When labels are swapped, the existing EXP value is kept. If the topmost EXP value is changed, this change is propagated downward only within the label stack, not to the IP packet.

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