Download New Latest (May) Cisco 642-883 Actual Tests 1-10

By | May 17, 2015

Ensurepass

Exam A

 

QUESTION 1

Which AS path access list is used by a multihomed customer to only announce their own address space to their service providers to prevent the multihomed customer from becoming a transit AS?

 

A.

ip as-path access-list permit.*

B.

ip as-path access-list permit^$

C.

ip as-path access-list permit _$

D.

ip as-path access-list permit _^

E.

ip as-path access-list permit local-as

ip as-path access-list deny *

F.

ip as-path access-list deny.*

ip as-path access-list permit *

 

Answer: B

Explanation:

 

 

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C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 2

Refer to the OSPF command exhibit.

 

clip_image002

 

 

Which effect does the no-summary command option have?

 

A.

It will cause area 1 to be able to receive non-summarized inter-area routes.

B.

It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.

C.

It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.

D.

It will convert the NSSA area into a NSSA totally stubby area.

E.

It will convert the stubby area into a NSSA.

F.

It will disable OSPF auto-summary.

 

Answer: B

Explanation:

clip_image003

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 3

Which high-availability mechanism is a detection protocol that is enabled at the interface

 

 

and at the routing protocol levels?

 

A.

NSF

B.

SSO

C.

NSR

D.

BFD

E.

SDR

 

Answer: D

Explanation:http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fs_bfd.html

 

 

QUESTION 4

Refer to the exhibit.

 

clip_image004

 

Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?

 

A.

bfd fast-detect also needs to be enabled globally under router ospf 100.

RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect

B.

bfd fast-detect also needs to be enabled for the OSPF area under area 0.

RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect

C.

bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1.

RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect

D.

bfd fast-detect also needs to be enabled globally on the router.

RP/0/RSP0/CPU0:P1(config#bfd fast-detect

E.

bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface

 

 

gi0/3/0/1.

RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect

 

Answer: C

Explanation:

bfd fast-detect

 

To enable Bidirectional Forwarding Detection (BFD) to detect failures in the path between adjacent forwarding engines, use the bfd fast-detect command in the appropriate configuration mode. To return the software to the default state in which BFD is not enabled, use the no form of this command.

 

bfd fast-detect [disable | ipv4]

no bfd fast-detect

 

 

QUESTION 5

When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)

 

A.

By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.

B.

By default, the IS-IS router type is Level 1 and Level 2.

C.

All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance ID.

D.

By default, metric-style narrow is used.

E.

By default, the IS-IS interface circuit type is Level 1 and Level 2.

F.

The area IS-IS address-family configuration command is used to specify the IS-IS area address.

 

Answer: BDE

Explanation:

 

 

clip_image005

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

The default metric style for single topology is narrow metrics. However, you can use either wide metrics or narrow metrics. How to configure them depends upon how single-topology is configured. If both IPv4 and IPv6 are enabled and single-topology is configured, the metric style is configured in the address-family ipv4 stanza. You may configure the metric style in the address-family ipv6 stanza, but it will be ignored in this case. If IPv6 only is enabled and single topology is configured, then the metric style is configured in the address-family ipv6 stanza.

 

 

 

clip_image006

 

C:Documents and Settingsuser-nwzDesktop1.JPG

 

 

QUESTION 6

Routes that are received from an IBGP peer will be propagated to which other routers by default?

 

A.

to the EBGP peers only

B.

to the IBGP peers only

C.

to both EBGP and IBGP peers

D.

to no other peers

 

Answer: A

 

 

QUESTION 7

Refer to the IS-IS configuration exhibit.

 

 

 

clip_image007

 

This is the typical IS-IS configuration of the routers in an AS using IS-IS as the IGP. This AS is in the transition phase of integrating IPv6 into the network. During this transition phase, some of the routers within the AS might be running IPv4 only, some might be running IPv6 only, and others might be running both IPv4 and IPv6. To avoid any black holes for the IPv6 traffic, which configuration change can be made?

 

A.

Disable IS-IS adjacency checks.

B.

Enable IPv6 adjacency over IPv4 IS-IS peering.

C.

Enable multi-topology IS-IS.

D.

Disable the IPv4 unicast address-family.

E.

Enable IS-IS wide metric to support the single-topology mode.

 

Answer: C

 

 

QUESTION 8

clip_image008

 

 

 

clip_image009

 

clip_image010

 

 

 

clip_image011

 

clip_image012

 

Which router has the su 10.5.10.0/24 [20/115] entry pointing to NullO in its routing table and why? (Choose two.)

 

A.

CE5

B.

PE5

C.

PE6

D.

The router is summarizing 10.5.10.1/32 into 10.5.10.0/24

E.

The router is suppressing the 10.5.10.0/24 route

F.

The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router

 

Answer: DF

Explanation:# show clns route

 

New Questions

 

 

QUESTION 9

Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)

 

A.

IP multicast routes are not supported.

B.

Outbound route filtering is configured only on a per-address family basis.

C.

Outbound route filtering can be configured for either iBGP or eBGP sessions.

D.

The outbound route filter can be defined in a Prefix list, Distribute list or Access lists.

E.

Outbound route filtering is more effective when a distance vector IGP is used.

 

Answer: AB

Explanation:http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fsbgporf.pdf

 

Restrictions for BGP Prefix-Based Outbound Route Filtering ?The BGP Prefix-Based Outbound Route Filtering feature does not support IP multicast routes.

?IP addresses that are used for outbound route filtering must be defined in an IP prefix-list. BGP distribute lists and IP access lists are not supported. ?Outbound route filtering is configured on only a per-address family basis and cannot be configured under the general session or BGP routing process (Router(config-router)#). ?Outbound route filtering is configured for only external peering sessions.

 

 

QUESTION 10

When configuring Cisco IOS XR route policy nesting, which command is used within a route policy to call another route policy?

 

A.

Apply

B.

Continue

C.

Jump

D.

Go to

E.

Call

 

Answer: A

Explanation:http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/command/reference/rr37plc y.html

 

Examples

In the following example, the policy CustomerIn applies the route-policy SetLocalPref to conditionally set the local preference on a route. The parameters 20, 30, 40, and 50 are passed to the parameterized policy SetLocalPref, where the local preference is set to:

 

?0, if the community 217:20 is present in the route ?0, if the community 217:30 is present in the route ?0, if the community 217:40 is present in the route ?0, if the community 217:50 is present in the route

 

RP/0/RP0/CPU0:router(config)# route-policy SetLocalPref ($lp0, $lp1, $lp2, $lp3, $lp4)

RP/0/RP0/CPU0:router(config-rpl)# if community matches-any ($lp0:$lp1)then RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp1 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp2) then

RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp2 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp3) then

RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp3 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp4) then

RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp4 RP/0/RP0/CPU0:router(config-rpl-elseif)# endif

RP/0/RP0/CPU0:router(config-rpl)# end-policy

 

 

 

RP/0/RP0/CPU0:router(config)# route-policy CustomerIn($cust) RP/0/RP0/CPU0:router(config-rpl)# apply SetLocalPref ($cust, 20, 30, 40, 50) RP/0/RP0/CPU0:router(config-rpl)# end-policy

RP/0/RP0/CPU0:router(config)# route-policy Cust_217 RP/0/RP0/CPU0:router(config-rpl)# apply CustomerIn(217) RP/0/RP0/CPU0:router(config-rpl)# end-policy

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