[Free] Download New Updated (December) Cisco 642-889 Exam Questions 41-50

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QUESTION 41

In MPLS Layer 3 VPN implementations, what is used at the PEs to transform the customer IPv4 prefixes into a unique 96-bit prefix?

 

A.

RT

B.

RD

C.

VC ID

D.

PW ID

E.

AS number

 

Correct Answer: B

 

 

QUESTION 42

Refer to the exhibit. XR2 must be configured with a static route for 2.2.2.0/24 subnet toward CE2 into the VRF ABC table. Which configuration achieves this goal?

 

clip_image002

 

A.

router static

vrf ABC

2.2.2.0/24 10.10.24.2

B.

router static

vrf ABC

2.2.2.0/24 10.10.24.2

address-family ipv4 unicast

C.

router static

vrf ABC

address-family ipv4 unicast

2.2.2.0/24 10.10.24.2

D.

router static

address-family ipv4 unicast

vrf ABC

2.2.2.0/24 10.10.24.2

 

Correct Answer: C

 

 

QUESTION 43

What is the purpose of the route distinguisher in a service provider network?

 

A.

to identify which prefixes should be imported

B.

to identify customer local prefixes

C.

to identify customer global prefixes

D.

to identify which prefixes should be exported from BGP

 

Correct Answer: C

 

 

QUESTION 44

Which VPN technology allows remote sites with dynamic IP addresses to connect to a central hub?

 

A.

static IPsec tunnels

B.

site-to-site VPN

C.

DMPVN

D.

VRFs

 

Correct Answer: C

 

 

QUESTION 45

In which configuration mode is a route distinguisher configured in a Cisco IOS XR router?

 

A.

config-vrf

B.

config-vrf-af

C.

config-bgp

D.

config-bgp-af

E.

config-bgp-vrf

 

Correct Answer: E

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.6/routing/configuration/guide/rc36book.pdf

 

clip_image004

 

 

QUESTION 46

Within the service provider IP/MPLS core network, what must be implemented to enable Layer 3 MPLS VPN services?

 

A.

IS-IS or OSPF on all the PE and P routers

B.

MP-BGP between the PE routers

C.

RSVP on all the PE and P routers

D.

targeted LDP between the PE routers

E.

LDP between the CE and PE routers

 

Correct Answer: B

 

 

QUESTION 47

What is required on a Cisco IOS XR router to assign an interface to a VRF?

 

A.

Assign the VRF to the interface, and then re-enable Cisco Express Forwarding on the interface.

B.

Assign the VRF to the interface, and then reset the CE-to-PE routing protocol process.

C.

Shut the interface, assign the VRF to the interface, and then no shut the interface.

D.

Remove the IP address configuration on the interface, assign the VRF to the interface, and then reconfigure the IP address on the interface.

 

Correct Answer: D

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.5/mpls/configuration/guide/gc35v3.html#wp1080845

clip_image006

 

 

QUESTION 48

A customer is connecting toa Cisco IOS XR PE device via BGP. The peering session is up and the customer is advertising routes, but the provider is not receiving any. Which issue is the most likely cause?

 

A.

The IOS XR device drops inbound routing updates on eBGP peers without an inbound route-policy.

B.

The IOS XR devicerequires as-override on all eBGP customer peers.

C.

The IOS XR devicerequires labeled-unicast peering sessions to eBGP customers.

D.

The IOS XR devicedrops inbound routing updates on eBGP peers that do not send extended communities.

 

Correct Answer: A

 

 

QUESTION 49

Refer to the exhibit. What is the AS-PATH list for an e-BGP update sent from ABC site 1 to ABC site 2 on the CE2 BGP table?

 

clip_image008

 

A.

300 300

B.

300 6500

C.

6500 300

D.

6500 6500

E.

6500 6500 200

 

Correct Answer: D

 

 

 

QUESTION 50

When configuring an EoMPLS PW on a Cisco IOS XR router, what are the two supported transport modes? (Choose two.)

 

A.

ethernet (Ethernet port mode)

B.

ip (routed mode)

C.

vlan (VLAN-tagged mode)

D.

transparent (bridged mode)

 

Correct Answer: AC

Explanation:

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/mpls/configuration/guide/gc38v2.ht ml#wp1072883

 

Ethernet Port Mode

Ethernet Remote Port Shutdown

VLAN Mode

Inter-AS Mode

QinQ Mode

QinAny Mode

Mac-in-Mac Protocol (Provide Backbone Bridging)

 

clip_image010

clip_image012

 

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