Free Cisco 642-887 Exam Dumps Questions & Answers

Which QoS technique can be used to protect customer traffic from being dropped by traffic rate limiting performed by the service provider?

• A.  policing
• B.  shaping
• C.  fair-queue
• D.  LLQ

Refer to the exhibit. If you remove the qos pre-classify command from this configuration which value is the tunnel unable to use to classify packets?

• A.  IP precedence value
• B.  protocol
• C.  DSCP code
• D.  MPLS EXP value

Refer to the partial Cisco IOS XR configurations exhibit for Router 1 and Router 2.

There are two routers that are connected back to back over the Gigabit Ethernet link. If the "show mpls ldp neighbor" command output on Router 1 does not show LDP peering with Router 2, what could be the possible root cause of the LDP peering problem?

• A.  missing interface under OSPF IGP configuration
• B.  password for LDP session mismatch on Router 1 and Router 2
• C.  MPLS LDP session protection is not configured
• D.  hello timers mismatch on Router 1 and Router 2

Refer to the exhibit. LSR A, LSR B, and LSR C have LDP running and see one another as neighbors. LSR A wants to send a packet that is destined for the LSR C loopback0 IP address. When LSR A first sends that packet to LSR B, which label value does the IP packet carry?

• A.  the label value that LSR B assigns to the LSR C loopback
• B.  the label value that LSR C assigns to LSR A when the LSRs need to exchange traffic
• C.  the label value that LSR A assigns to the LSR C loopback
• D.  the label value that LSR C assigns to the LSR C loopback

Which two actions can a PE router perform on QoS traffic? (Choose two.)

• A.  It can use the IP precedence value to perform QoS on traffic egressing from a LAN interface to the MPLS core.
• B.  It can mark egress traffic that is destined to CE devices with MPLS EXP bits to indicate that the traffic traversed the MPLS backbone.
• C.  It can transmit marked egress traffic from the service-provider core unchanged to the CE device.
• D.  It can use MPLS EXP bits to reclassify marked ingress traffic from CEs.
• E.  It can transmit marked ingress traffic from CEs unchanged to the service-provider core.