[Free] Download Latest (March 2016) Cisco 642-887 Real Exam 61-70

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QUESTION 61

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

 

Correct Answer: CD

 

 

QUESTION 62

Which two traffic types are recognized by NBAR default configuration settings? (Choose two.)

 

A.

HTTP URL

B.

Sun RPC

C.

TCP

D.

UDP

E.

HTTPS URL

 

Correct Answer: AB

 

 

QUESTION 63

Which three steps are required to configure QPPB on Cisco IOS XR routers? (Choose three.)

 

A.

Apply a QPPB route policy to the BGP process using the table-policy command

B.

Apply a QPPB route policy to the BGP neighbor using the route-policy command

C.

Define a QPPB route policy to match the customer routes, then set the IP precedence or qos-group

D.

Define a QPPB route policy to match the customer IP precedence or qos-group markings, then set the BGP community

E.

Enable QPPB on an interface using the ipv4 bgp policy propagation input ip- precedence|qos-group destination|source command

F.

Enable QPPB on an interface using the ipv4 bgp policy propagation output ip- precedence|qos-group destination|source command

 

Correct Answer: ACE

Explanation:

QoS Policy Propagation via BGP (QPPB), is a mechanism that allows propagation of quality of service (QoS) policy and classification by the sending party based on access lists, community lists and autonomous system paths in the Border Gateway Protocol (BGP), thus helping to classify based on destination instead of source address.

 

 

QUESTION 64

An engineer is setting up a routing instance to route the traffic across the back-up tunnel on a deployed Cisco MPLS TE next-hop protection. Which option describes the result?

 

A.

a static route that points to the link

B.

BGP routes that points to the link

C.

an OSPF or IS-IS instance that explicitly advertises the back-up tunnel

D.

rerouted traffic by the back-up tunnel in the event of link failure

 

Correct Answer: D

 

 

QUESTION 65

Which field in the MPLS shim header is used to support different QoS markings?

 

A.

IP precedence

B.

DSCP

C.

EXP

D.

ToS

E.

S

F.

Label

 

Correct Answer: C

Explanation:

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.

 

 

QUESTION 66

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

 

clip_image002

 

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.

 

Correct Answer: B

 

 

 

QUESTION 67

A DSCP value of 41 in decimal corresponds to which IP precedence value?

 

A.

3 – Flash

B.

4 – Flash Override

C.

5 – Critical

D.

6 – Internet Control

E.

7 – Network Control

 

Correct Answer: C

Explanation:

= INT(41/8)

The AF behavior group defines four separate AF classes with Class 4 having the highest priority. Within each class, packets are given a drop precedence (high, medium or low). The combination of classes and drop precedence yields twelve separate DSCP encodings from AF11 through AF43 (see table)

 

clip_image003

 

 

QUESTION 68

Cisco MPLS TE resource attributes that are configured locally for each link are distributed to the headend router of the traffic engineering tunnel using which protocol?

 

A.

BGP

B.

MP-BGP

C.

LDP

D.

RSVP

E.

OSPF or IS-IS with TE extension

 

Correct Answer: E

 

 

QUESTION 69

In an IPv6 header, what does a flow label of zero indicate?

 

A.

The packet is not part of any flow.

B.

The size of the flow label is zero bytes.

C.

The label flow cannot have a value of zero.

D.

The packet belongs to the flow labeled zero.

 

Correct Answer: A

 

QUESTION 70

Which two considerations are important when implementing a Cisco MPLS TE NHOP or NNHOP protection? (Choose two.)

 

A.

The head-end router requires configuring high priority for the Cisco MPLS TE tunnel.

B.

The head-end router requires configuration for the NHOP or NNHOP protection request to occur.

C.

The reconvergence time must be no longer than 10 seconds.

D.

The Cisco MPLS TE tunnel on the Point of Local Repair implementing protection requires configuration as backup interface.

E.

The tail-end router must be aware of the request for NHOP or NNHOP protection.

 

Correct Answer: BD

 

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