Download New Latest (May) Cisco 642-883 Actual Tests 31-40

By | May 17, 2015

Ensurepass

 

QUESTION 31

Refer to the exhibit.

 

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Based on the Cisco IOS XR route policy configuration, when redistributing OSPF routes into IS-IS, to which of the following does the “tag” value correspond?

 

A.

The tag value represents the OSPF metric.

B.

The tag value represents the IS-IS metric.

C.

The tag value identifies a route or set of routes.

D.

The tag value is used to match whether the IS-IS route is an external or internal IS-IS route.

E.

The tag value represents the administrative distance.

 

Answer: C

 

 

QUESTION 32

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On the PE5 router, there are how many IPv4 and IPv6 OSPF neighbors and how many IPv4 OSPF interfaces? (Choose three)

 

A.

Two ipv4 ospf neighbors

B.

Three ipv4 ospf neighbors

C.

Two ipv6 ospf neighbors

D.

Three ipv6 ospf neighbors

E.

Three ipv4 ospf interfaces

F.

Four ipv4 ospf interfaces

 

Answer: AEF

Explanation:# show ip ospf neighbor

# show ipv6 ospf neighbor

 

 

QUESTION 33

When implementing LDP, what is liberal label retention mode?

 

A.

To reduce the convergence time, the LSR will retain all the received labels in its LIB even if all the neighbor LSRs go down temporary

B.

The LSR can assign it’s own label for each destination network even though it has not been assigned a next hop label from the neighbor LSR

C.

The LSR will store the label received from the downstream LSRs in its LIB even if the downstream LSRs are not the next hop for the destination

D.

The LSR will not perform PHP if it is operating in liberal label retention mode

 

Answer: C

Explanation:By default, LDP accepts labels (as remote bindings) for all prefixes from all peers. LDP operates in liberal label retention mode, which instructs LDP to keep remote bindings from all peers for a given prefix. For security reasons, or to conserve memory, you can override this behavior by configuring label binding acceptance for set of prefixes from a given peer.

 

The ability to filter remote bindings for a defined set of prefixes is also referred to as LDP inbound label filtering

 

 

QUESTION 34

DRAG DROP

 

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Answer:

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 35

Which of the following is a characteristic of dual-multihomed connectivity between an enterprise network and the service provider network or networks?

 

A.

An enterprise network that is connected to two or more different service providers with two or more links per service provider and using BGP to exchange routing updates with the service providers.

B.

Each service provider announces a default route on each of the links that connect to the customer with a different metric.

C.

An enterprise network announces a default route to each service provider.

D.

Load balancing can be achieved using the maximum-paths command.

 

Answer: A

 

 

QUESTION 36

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How many total OSPF virtual links are configured in this multiarea OSPF network which supports both OSPFv2 and OSPFv3 for IPv4 and IPv6 routing?

 

A.

1

B.

2

C.

3

D.

4

 

Answer: B

Explanation:#Show running-config | include virtual ?check how many router having “virtual ” entry

 

 

QUESTION 37

Refer to the topology diagram in the exhibit.

 

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Which IS-IS feature could be implemented so that the return path for the packets from router Y in area 49.00AA to router X in area 49.00BB will use the more optimal path?

 

A.

Enable route leaking to pass Level 2 information into the Level 1 routers.

B.

Change the area 49.00AA type from a stub area to a regular area.

C.

Change the IS-IS administrative distance on router Y in area 49.00AA.

D.

Change the IS-IS metric type from narrow to wide on all IS-IS routers.

 

Answer: A

Explanation:http://www.cisco.com/application/pdf/paws/13796/route-leak.pdf

 

 

 

The ISIS routing protocol allows for a twolevel hierarchy of routing information. There can be multiple Level 1 areas interconnected by a contiguous Level 2 backbone. A router can belong to Level 1, Level 2, or both. The Level 1 linkstate database contains information about that area only. The Level 2 linkstate database contains information about that level as well as each of the Level 1 areas. An L1/L2 router contains both Level 1 and Level 2 databases. It advertises information about the L1 area to which it belongs into L2. Each L1 area is essentially a stub area. Packets destined for an address that is outside of the L1 area are routed to the closest L1/L2 router to be forwarded on to the destination area. Routing to the closest L1/L2 router can lead to suboptimal routing when the shortest path to the destination is through a different L1/L2 router. Route leaking helps reduce suboptimal routing by providing a mechanism for leaking, or redistributing, L2 information into L1 areas. By having more detail about inter area routes, an L1 router is able to make a better choice with regard to which L1/L2 router to forward the packet.

 

 

QUESTION 38

Refer to the network diagram in the exhibit.

 

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If both ASBRs are advertising the external Destination X network as OSPF E2 route, what is the best path for the R1 router to reach Network X?

 

A.

R1 will use the path via ASBR 2 as the best path.

B.

R1 will use the path via ASBR 1 as the best path.

C.

R1 will load balance between two equal cost paths via ASBR 1 and ASBR 2.

D.

R1 will sees two equal costs and will choose the path through the ASBR with the lower OSPF router ID.

 

Answer: B

 

 

QUESTION 39

DRAG DROP

 

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Answer:

 

 

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A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 40

Refer to the C

isco IOS XE IS-IS configuration exhibit.

 

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What are two problems with the configuration that are causing the IPv4, or the IPv6, or the IPv4 and IPv6 IS-IS operations to fail? (Choose two.)

 

A.

The configuration is missing the interface gi0/0 and interface gi0/0 commands under router isis 1.

B.

The configuration is missing the address-family ipv4 unicast and address-family ipv6 unicast commands under router isis 1.

C.

IPv6 unicast routing has not been enabled globally on the Cisco IOS XE router.

D.

The gi0/0 and gi0/1 interfaces are not participating in the router isis 1 routing instance.

E.

Multitopology IS-IS must be enabled to support both IPv4 and IPv6.

F.

Another router isis instance must be enabled to support IPv6.

 

Answer: CD

Explanation:http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_50_se/co nfiguration/guide/swipv6.pdf

 

?When using user-network interface (UNI) or enhanced network interface (ENI) ports for any

IPv6-related features, you must first globally enable IP routing and IPv6 routing on the switch by entering the ip routing ipv6 unicast-routing

 

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