Download New Latest (May) Cisco 642-887 Actual Tests 1-10

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Exam A

 

QUESTION 1

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

 

Answer: E

 

 

QUESTION 2

When implementing Cisco MPLS TE, the constrained-based path calculations will use which value as the TE cost of each link within the MPLS domain?

 

A.

By default, it will use the IGP metric, or each link can be assigned a specific value using the admin-weight command.

B.

It can only use the IGP metric as the TE cost.

C.

It will use the interface bandwidth as the TE cost.

D.

Each link must be assigned a TE cost using the metric command.

 

Answer: A

 

 

QUESTION 3

With unmanaged CE routers, at which point in the service provider network is the QoS trust boundary, and what is required at the trust boundary?

 

A.

between the CE and PE router and mapping of the customer traffic classes into the service provider traffic classes at the PE router ingress

B.

between the CE and PE router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings

C.

between the PE and the P router and mapping of the customer traffic classes into the service provider traffic classes at the P router ingress

D.

between the PE and P router and trusting the QoS markings from the CE router and applying the required QoS mechanisms based on the customer QoS markings

E.

between the customer network and the CE router ingress and applying the re
quired egress QoS policy on the CE router

 

Answer: A

 

 

QUESTION 4

Refer to the Cisco IOS XR policy-map configuration exhibit.

 

clip_image001

 

What is wrong with the policy-map configuration?

 

A.

missing the priority percent command under class one and class two

B.

missing the police command under class one and class two

C.

missing the police command under class three

D.

missing the priority bandwidth command under class one and class two

E.

missing the bandwidth command under class one and class two

 

Answer: B

Explanation:Hierarchical policing is also supported. In such a configuration, both parent and child policies have class-maps

 

containing policing statements, as in the following example:

 

 

 

!

policy-map child

class gold

police rate percent 50 conform-action set precedence immediate exceed-action drop

!

!

policy-map parent

class match_all

police rate 10000 kbps burst 15000 exceed-action drop service-policy child

 

 

QUESTION 5

Cisco MPLS TE path setup can be affected by which three tunnel attributes? (Choose three.)

 

A.

bandwidth

B.

delay

C.

MTU

D.

priority

E.

affinity

 

Answer: ADE

 

 

QUESTION 6

Which Cisco IOS XR command should be used to identify if MPLS TE FRR is enabled?

 

A.

show mpls traffic-eng tunnel <tunnel#>

B.

show mpls frr

C.

show mpls traffic-eng protection

D.

show mpls protection

E.

show mpls fast-reroute

 

Answer: A

Explanation:The MPLS Traffic Engineering (TE)–Fast Reroute (FRR) Link and Node Protection feature provides link protection (backup tunnels that bypass only a single link of the label-switched path (LSP)), node protection (backup tunnels that bypass next-hop nodes along LSPs), and the following FRR features:

·Backup tunnel support

·Backup bandwidth protection

·Resource Reservation Protocol (RSVP) Hellos

 

Prerequisites for MPLS Traffic Engineering (TE)–Fast Reroute (FRR) Link and Node Protection

 

Your network must support the following Cisco IOS features:

·IP Cisco Express Forwarding

·Multiprotocol Label Switching (MPLS)

Your network must support at least one of the following protocols:

·Intermediate System-to-Intermediate System (IS-IS) ·Open Shortest Path First (OSPF)

Before configuring FRR link and node protection, it is assumed that you have done the following tasks but you do not have to already have configured MPLS TE tunnels:

·Enabled MPLS TE on all relevant routers and interfaces ·Configured MPLS TE tunnels

 

 

QUESTION 7

On Cisco routers, how is hierarchical QoS implemented?

 

A.

Within the parent policy, reference another child policy using the policy-map command.

B.

Within the child policy, reference another parent policy using the policy-map command.

C.

Use the policy-map command within a service-policy to implement nested policy-maps.

D.

Within the parent policy-map, reference another child policy-map using the service- policy command.

 

Answer: D

 

 

QUESTION 8

Scenario:

 

clip_image002

 

clip_image003

 

 

 

clip_image004

 

clip_image005

 

From PE8 router, what is the label action used to reach the P2 loopback 0 interface

Q1

0.2.1/32?

 

A.

Swap label 35 with label 16004

B.

Push label 16004

C.

Pop label 35

D.

Pop label 16009

E.

Push Label 16009

F.

Swap label 35 with label 16009

 

Answer: C

Explanation: show mpls forwarding-table , find prefix 10.0.2.1 and you will see there under outgoing Label “Pop Label” (This is actually logic because the prefix is directly connected and therefore the packet will forward without label). If the router should forward any packet to that prefix, the packet should be received with Local label on PE8 (Local Label = 35), the router will remove it and forward it without Label.

 

 

QUESTION 9

Which two statements are correct in describing ISP environments that are running IP/MPLS in the core network? (Choose two.)

 

A.

On the PE routers, each BGP route must use a unique label to reach the BGP next hop.

B.

The BGP next hops point to the PE routers, and only the PE routers are required to run BGP.

C.

A full mesh of IBGP sessions are required between all of the PE and P routers to ensure proper packets forwarding.

D.

The PE and P routers run LDP to learn the labels for reaching the BGP next-hop addresses.

 

Answer: BD

 

 

QUESTION 10

When troubleshooting LDP operations on the Cisco IOS and IOS XE routers, what is one of the first things that should be verified?

 

A.

if running OSPF as the IGP, ensure that OSPFv3 has been enabled

B.

check if the ip cef command has been enabled

C.

verify in the running configurations that all of the required LDP interfaces are defined under the mpls ldp command configuration mode

D.

verify if there are any access lists that are denying TCP and UDP port 464 packets

 

Answer: B

 

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