Download New Latest (May) Cisco 642-887 Actual Tests 31-40

Ensurepass

 

QUESTION 31

When a link flaps, an mpls ldp session will also flap. Which feature minimizes traffic loss and provides faster convergence after the link is re-established?

 

A.

BFD

B.

MPLS LDP IGP SYNC

C.

graceful restart

D.

LDP session protection

E.

LDP nonstop routing

 

Answer: D

 

 

QUESTION 32

DRAG DROP

 

 

 

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Answer:

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 33

On Cisco routers, which QoS marker is only locally significant?

 

A.

DSCP

B.

MPLS EXP

C.

IP precedence

D.

QoS group

E.

discard eligible (DE)

 

Answer: D

 

 

QUESTION 34

Which affinity and mask value will match the link affinity that has 0x0F in the first 8 bits and 0x01 in the last 8 bits, and the middle 16 bits can be any value?

 

A.

affinity 0x0F000001 mask 0x0F000001

B.

affinity 0x0F000001 mask 0x00000000

C.

affinity 0x0F000001 mask 0x11111111

D.

affinity 0x0F000001 mask 0x11000011

E.

affinity 0x0F000001 mask 0xFF0000FF

F.

affinity 0x0F000001 mask 0x00FFFF00

 

Answer: E

 

 

QUESTION 35

DRAG DROP

 

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Answer:

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 36

When implementing MPLS DS-TE on Cisco IOS XR routers, all aggregate Cisco MPLS TE traffic is mapped to which class type by default?

 

A.

class-type 0 (bandwidth global pool)

B.

class-type 1 (bandwidth subpool)

C.

class-type 2 (bandwidth priority)

D.

class type class-default (bandwidth best-effort)

 

Answer: A

Explanation:Differentiated Services Traffic Engineering

MPLS Differentiated Services (Diff-Serv) Aware Traffic Engineering (DS-TE) is an extension of the regular

 

MPLS-TE feature. Regular traffic engineering does not provide bandwidth guarantees to different traffic classes. A single bandwidth constraint is used in regular TE that is shared by all traffic. To support various classes of service (CoS), users can configure multiple bandwidth constraints. These bandwidth constraints can be treated differently based on the requirement for the traffic class using that constraint.

 

MPLS diff-serv traffic engineering provides the ability to configure multiple bandwidth constraints on an MPLSenabled interface. Available bandwidths from all configured bandwidth constraints are advertised using IGP.

 

TE tunnel is configured with bandwidth value and class-type requirements. Path calculation and admission control take the bandwidth and class-type into consideration. RSVP is used to signal the TE tunnel with bandwidth and class-type requirements.

 

Diff-Serv TE can be deployed with either Russian Doll Model (RDM) or Maximum Allocation Model (MAM) for bandwidth calculations.

 

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QUESTION 37

Which item is not available to be used for QoS classification in Cisco IOS XR?

 

A.

MAC SA

B.

protocol

C.

inner EXP

D.

discard-class

E.

QoS-group

F.

VLAN

 

Answer: C

 

 

QUESTION 38

Which three statements are correct regarding a Cisco MPLS TE? (Choose three.)

 

A.

A Cisco MPLS TE tunnel maps onto an LSP path.

B.

Tunnels are bidrectional by default.

C.

Packets that are mapped into a Cisco MPLS TE tunnel will have two labels, with the top label indicating what the tail-end router should do with the packet.

D.

A tunnel that is created with a priority of 0 can pre-empt an existing tunnel with a priority of 7.

E.

CBR takes into account link resource and traffic tunnel attributes.

F.

RSVP is used between customer routers.

 

Answer: ADE

 

 

QUESTION 39

When using the tunnel mpls traffic-eng path-option 1 explicit name test command in Cisco MPLS TE tunnel configurations, the test explicit-path configuration will consist of a list of which values?

 

A.

tunnel endpoint

B.

resource class affinity

C.

MPLS label

D.

IP address

 

Answer: D

Explanation:tunnel mpls traffic-eng path-option

To configure a path option for a Multiprotocol Label Switching (MPLS) traffic engineering tunnel, use the tunnel

mpls traffic-eng path-option command in interface configuration mode. To disable the specified path option, use the no form of this command.

 

tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}} [lockdown]

no tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}} [lockdown]

 

Syntax Description

number = When multiple path options are configured, lower numbered options are preferred.

dynamic = Path of the LSP is dynamically calculated.

explicit = Path of the LSP is an IP explicit path.

name path-name = Path name of the IP explicit path that the tunnel uses with this option. path-number = Path number of the IP explicit path that the tunnel uses with this option. lockdown = (Optional) The LSP cannot be reoptimized.

 

Usage Guidelines

You can configure multiple path options for a single tunnel. For example, there can be several explicit path options and a dynamic option for one tunnel. Path setup preference is for lower (not higher) numbers, so option 1 is preferred.

 

Examples

The following example shows how to configure the tunnel to use a named IP explicit path:

 

Router(config-if)# tunnel mpls traffic-eng path-option 1 explicit name test

 

 

QUESTION 40

Which three mechanisms are used to implement MPLS TE? (Choose three.)

 

A.

tunnel interface

B.

CSPF

C.

RSVP

D.

LDP

E.

MP-BGP

 

Answer: ABC

Explanation:Constrained-Based Shortest Path First (CSPF).

Resource Reservation Protocol – Traffic Engineering is an extension of the resource reservation protocol (RSVP) for traffic engineering.

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