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The 642-887 SPCORE Implementing Cisco Service Provider Next-Generation Core Network Services exam. This exam tests a candidate's knowledge of the concepts and implementation of MPLS technology and MPLS-TE services. It also validates the understanding of technology principles of basic Quality of Service, and Quality of Service with Multi Protocol Label Switching (MPLS) to implement advanced features and functions. Candidates can prepare for this exam by taking the Implementing Cisco Service Provider Next-Generation Core Network Services (SPCORE) course.
A. DSCP
B. MPLS EXP
C. IP precedence
D. QoS group
E. discard eligible (DE)
Answer: D
NO.2 Which statement describes the QoS behavior between P and PE routers of an MPLS provider
network for an L3VPN service?
A. The PE function honors DSCP markings set by the CE.
B. The customer and provider must agree on DSCP classification and traffic priorities.
C. Classification of customer traffic is handled by the P router.
D. The PE function cannot map DSCP markings to MPLS EXP bits.
Answer: B
NO.3 What is the term that is used for the label that an LSR assigns and distributes to other LSRs in
MPLS?
A. Local
B. Remote
C. Explicit
D. Explicit Null
E. Aggregate
Answer: A
NO.4 On Cisco routers, which three methods can be used to map traffic into the MPLS traffic
engineering tunnel? (Choose three.)
A. on-demand routing
B. static routing
C. optimized edge routing
D. policy-based routing
E. autoroute
Answer: B,D,E
NO.5 In which two Cisco IOS XR configuration modes can mpls ldp igp sync be configured? (Choose
two.)
A. config-ldp
B. config-if
C. config-ospf-ar
D. config-ospf
E. config-isis
Answer: C,D
NO.6 A network engineer must analyze RSVP-TE signaling on a syslog server. Which three RSVP
messages are valid? (Choose three.)
A. RSVP PATH
B. RSVP RESERVATION
C. RSVP ESTABLISHED
D. RSVP PATH TEAR
E. RSVP KILL
F. RSVP INIT
Answer: A,B,D
NO.7 Which option describes what happens when a labelled packet with a TTL of 1 is received by an
LSR?
A. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time
exceeded" message is generated and routed back to the source.
B. The packet is dropped and an ICMP "time exceeded" message is IP routed back to the sender.
C. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring
router back on a new path toward the source.
D. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring
router on the same label switched path toward the destination and then back to the originating
source.
E. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time
exceeded" message is generated and label switched back to the source.
Answer: D
NO.8 A network operations center requests support to configure a Cisco MPLS TE tunnel on a Cisco
IOS XR router. Which command sets a specific bandwidth required to the corresponding Cisco MPLS
TE tunnel?
A. rsvp interface interface-path-id bandwidth bandwidth
B. interface tunnel-te tunnel_id ! bandwidth bandwidth
C. interface tunnel-te tunnel_id ! signaled-bandwidth bandwidth
D. mpls traffic-eng auto-bw collect frequency value !
Answer: C