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Latest and Most Accurate Cisco 642-887 Dumps Exam Questions and Answers:
What are the four fields inside the MPLS shim header? (Choose four.)
Answer: A, B, D, F
Which two of the following statements are correct regarding LSPs? (Choose two.)
A. An LSP is created for every routing protocol entry.
B. Each LSP is bidirectional, that is, packets traveling in the opposite direction use the same LSP.
C. An IGP is used to populate routing tables in all routers in an MPLS domain.
D. LDP is used to propagate labels and build LSPs.
E. The FIB is used to forward MPLS-labeled packets down an LSP.
Answer: C, D
DS-TE implementations on Cisco routers support which bandwidth pool(s) and class type(s)? (Choose two.)
A. global pool only
B. subpool only
C. global pool and subpool
D. class-type 0 only
E. class-type 1 only
F. class-type 0 and class-type 1
Answer: C, F
Differential Service Tunnels
Differential Service Traffic Engineering (TE) is an extension of the regular MPLS Traffic Engineering (MPLSTE) feature. Regular TE does not provide bandwidth guarantees to different traffic classes. A single bandwidth pool (global pool) is used in regular TE that is shared by all traffic. In order to support various class of service (CoS), the ability to provide multiple bandwidth pools is required. These bandwidth pools then can be treated differently based on the requirement for the traffic class using that pool.
In RSVP global and subpools reservable bandwidths are configured on a per interface basis to accommodate TE tunnels on the node. Available bandwidth from all configured bandwidth pools is advertised using Interior Gateway Protocol (IGP). RSVP is used to signal the TE tunnel with appropriate bandwidth pool requirements.
Which field in the MPLS shim header is used to support different QoS markings?
A. IP precedence
MPLS EXP Marking
The three MPLS EXP (experimental) bits in the shim header of an input or output MPLS packet header may be set or changed by a user configured value
On a Cisco IOS XR router, which mechanism protects the router resources by filtering and policing the packets flows that are destined to the router that is based on defined flow-type rates?
C. Committed Access Rate
D. Control Plane Policing
E. Management Plane Protection
Local Packet Transport Services (LPTS) maintains tables describing all packet flows destined for the secure domain router (SDR), making sure that packets are delivered to their intended destinations.
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing (CBWFQ).
When configuring LLQ (strict priority queue) on a traffic class using the Cisco IOS XR priority command on a Cisco ASR9K router, which additional QoS command is required for this traffic class?
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