Cisco 642-887 Online Practice Questions and Exam Preparation

Cisco 642-887 Online Questions & Answers

• Question 141:

  Referring to the show output exhibit, which statement is correct?

  

  A. The P1 router is receiving label information for the 10.0.2.1/32 prefix from two LDP peers.
  B. The P1 router is receiving label information for the 10.7.1.1/32 prefix from two LDP peers.
  C. The P1 router is using the IMP-NULL local label for the 10.7.1.1/32 prefix because 10.7.1.1/32 is the loopback interface IP address on the P1 router.
  D. The P1 router will perform PHP for the 10.7.1.1/32 and 10.7.10.1./32 prefixes.
  B. The P1 router is receiving label information for the 10.7.1.1/32 prefix from two LDP peers.

• Question 142:

  When configuring class-based WRED on Cisco routers, which WRED parameter is not user configurable on a Cisco IOS XR but is user configurable on a Cisco IOS and IOS XE?

  A. the ingress or egress direction where the class-based WRED policy will be applied
  B. the maximum threshold
  C. the minimum threshold
  D. the mark probability denominator
  D. the mark probability denominator

• Question 143:

  Which three fields must be the same in an IPv6 header to consider different packets on the same flow? (Choose three.)

  A. source port
  B. destination address
  C. destination port
  D. source address
  E. flow label
  F. transport protocol type
  B. destination address
  D. source address
  E. flow label

• Question 144:

  Which statement is correct regarding the default MPLS TTL behavior?

  A. When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will set the MPLS Label TTL field to 255.
  B. When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will copy the decremented IP TTL field into the MPLS Label TTL field.
  C. When an ingress edge LSR receives an IP packet, it will just copy the IP TTL field into the MPLS Label TTL field.
  D. When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the MPLS Label TTL field by 1.
  E. When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the IP TTL field by 1.
  B. When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will copy the decremented IP TTL field into the MPLS Label TTL field.

• Question 145:

  Refer to the Cisco IOS XR configuration exhibit.

  

  Which statement is correct?

  A. The backup tunnel-te 10 tunnel is using the highest setup and hold priority settings of 7.
  B. The backup tunnel path is learned dynamically.
  C. The fast-reroute command is missing under the (config-mpls-te-if)# configuration mode.
  D. Interface gi0/0/0/10 is the protected link.
  D. Interface gi0/0/0/10 is the protected link.

• Question 146:

  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.
  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.

• Question 147:

  Given this configuration of an interface for MPLS traffic engineering on a Cisco IOS XE router:

  interface POS1/1/0

  mpls traffic-eng tunnels

  ip rsvp bandwidth 5000

  Which option lists the equivalent configurations required on a Cisco IOS XR router?

  A. interface POS1/1/0 mpls traffic-eng tunnels ip rsvp bandwidth 5000
  B. mpls traffic-eng interface POS1/1/0
  C. mpls traffic-eng interface POS1/1/1 bandwidth 5mb
  D. mpls traffic-eng interface POS1/1/0 rsvp interface POS1/1/0
  E. mpls traffic-eng interface POS1/1/0 rsvp interface POS1/1/0 bandwidth 5000
  E. mpls traffic-eng interface POS1/1/0 rsvp interface POS1/1/0 bandwidth 5000

• Question 148:

  Which method maps MPLS EXP bit 5 to COS 5 on Cisco IOS XE?

  A. configure terminal class-map match exp match mpls experimental topmost 5 exit policy-map EXP2Cos class exp set cos 5 exit class class-default random-detec interface fastethernet 0/0 service-policy output EXP2Cos
  B. configure terminal class-map match exp match mpls experimental topmost 5 exit policy-map EXP2Cos class exp set cos 5 exit class class-default random-detec interface fastethernet 0/0 service-policy input EXP2Cos
  C. configure terminal class-map match exp match mpls cos 5 exit policy-map EXP2Cos class exp set mpls experimental topmost 5 exit class class-default random-detec interface fastethernet 0/0 service-policy output EXP2Cos
  D. configure terminal class-map match exp match mpls cos 5 exit policy-map EXP2Cos class exp set mpls experimental topmost 5 exit class class-default random-detec interface fastethernet 0/0 service-policy output EXP2Cos exit commit
  E. configure terminal ip access-list 101 permit ip any any mpls experimental 5 class-map match exp match access-group 101 exit policy-map EXP2Cos class exp set cos 5 exit class class-default random-detec interface fastethernet 0/0 service-policy output EXP2Cos exit
  A. configure terminal class-map match exp match mpls experimental topmost 5 exit policy-map EXP2Cos class exp set cos 5 exit class class-default random-detec interface fastethernet 0/0 service-policy output EXP2Cos

• Question 149:

  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
  C. config-ospf-ar
  D. config-ospf

• Question 150:

  Which three network services can be implemented using MPLS within the service provider IP NGN core? (Choose three.)

  A. Layer 2 VPNs
  B. Layer 3 VPNs
  C. traffic engineering
  D. IntServ traffic engineering tunnels
  E. encrypted LSPs
  A. Layer 2 VPNs
  B. Layer 3 VPNs
  C. traffic engineering