Download New Latest (May) Cisco 642-883 Actual Tests 41-50

Ensurepass

 

QUESTION 41

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What is the configured IS-IS circuit-type between the CE5 and PE5 routers and between the PE5 and PE6 routers? (Choose two.)

 

A.

Circuittype L1 between CE5 and PE5 4

B.

Circuittype L1/L2 between CE5 and PE5

C.

Circuittype L2 between CE5 and PE5

D.

Circuittype L1 between PE5 and PE6

E.

Circuittype L1/L2 between PE5 and PE6

F.

Circuittype L2 between PE5 and PE6

 

Answer: AF

Explanation:#show clns neighbor

 

 

QUESTION 42

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Which statement Is correct regarding the DR election process In this OSPF implementation?

 

A.

Both the CE5 and PE6 routers are DROTHERs

B.

PE5 is the OSPFv2 DR for the GigabitEthernet link between PE5 and PE6

C.

PE6 is the OSPFv2 and OSPFv3 DR for the GigabitEthernet link between PE5 and PE6

D.

PE6 is the DR for the GigabitEthernet link between PE5 and PE6 because it has a higher OSPF priority

 

Answer: A

Explanation: # show ip ospf neighbor

# show ipv6 ospf neighbor

 

 

QUESTION 43

Which high-availability routing feature requires the neighbor router to support the graceful restart capability?

 

A.

BFD

B.

NSR

C.

NSF

D.

MTR

 

Answer: C

Explanation:On Cisco IOS XR software, NSF minimizes the amount of time a network is unavailable to its users following a route processor (RP) failover. The main objective of NSF is to continue forwarding IP packets and perform a graceful restart following an RP failover.

 

When a router restarts, all routing peers of that device usually detect that the device went down and then came back up. This transition results in what is called a routing flap, which could spread across multiple routing domains. Routing flaps caused by routing restarts create routing instabilities, which are detrimental to the overall network performance. NSF helps to suppress routing flaps in NSF-aware devices, thus reducing network instability.

 

NSF allows for the forwarding of data packets to continue along known routes while the routing protocol information is being restored following an RP failover. When the NSF feature is configured, peer networking devices do not experience routing flaps. Data traffic is forwarded through intelligent line cards while the standby RP assumes control from the failed active RP during a failover. The ability of line cards to remain up through a failover and to be kept current with the Forwarding Information Base (FIB) on the active RP is key to NSF operation.

 

 

 

When the Cisco IOS XR router running IS-IS routing performs an RP failover, the router must perform two tasks to resynchronize its link-state database with its IS-IS neighbors. First, it must relearn the available IS-IS neighbors on the network without causing a reset of the neighbor relationship. Second, it must reacquire the contents of the link-state database for the network.

The IS-IS NSF feature offers two options when configuring NSF:

·IETF NSF

·Cisco NSF

 

If neighbor routers on a network segment are NSF aware, meaning that neighbor routers are running a software version that supports the IETF Internet draft for router restartability, they assist an IETF NSF router that is restarting. With IETF NSF, neighbor routers provide adjacency and link-state information to help rebuild the routing information following a failover.

In Cisco IOS XR software, Cisco NSF checkpoints (stores persistently) all the state necessary to recover from a restart without requiring any special cooperation from neighboring routers. The state is recovered from the neighboring routers, but only using the standard features of the IS-IS routing protocol. This capability makes Cisco NSF suitable for use in networks in which other routers have not used the IETF standard implementation of NSF

 

 

QUESTION 44

When using the Cisco IOS-XR show bgp command to examine the BGP table, the Metric value being displayed is used to represent which BGP attribute?

 

A.

Weight

B.

Local Preference

C.

MED

D.

Cost Community

 

Answer: C

 

 

QUESTION 45

Refer to the route policies exhibit.

 

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Which five route policies will cause the routes to be dropped or passed? (Choose five)

 

A.

route-policy one will cause the routes to be dropped.

B.

route-policy two will cause the routes to be dropped.

C.

route-policy three will cause the routes to be dropped.

D.

route-policy four will cause the routes to be dropped.

E.

route-policy five will cause the routes to be dropped.

F.

route-policy one will cause the routes to be passed.

G.

route-policy two will cause the routes to be passed.

H.

route-policy three will cause the routes to be passed.

I.

route-policy four will cause the routes to be passed.

J.

route-policy five will cause the routes to be passed.

 

Answer: ACEGI

 

 

QUESTION 46

Refer to the BGP and route map configurations exhibit.

 

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When the “setas” route map is applied to the 10.1.1.2 neighbor, the 10.1.1.2 neighbor is not able to receive all the required BGP routes from this router. What could be the problem?

 

A.

The BGP session was cleared using the clear ip bgp command after the route map was applied.

B.

The test1 or test2 prefix-list is misconfigured.

C.

There is no pass action configured within the route map.

D.

The route map is missing the route-map setas permit 30 statement.

 

Answer: D

 

 

QUESTION 47

Refer to the Cisco IOS route map configuration exhibit.

 

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Which two statements are correct? (Choose two.)

 

A.

The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.

B.

All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path access list.

C.

The three match conditions are logical AND. match prefix list PL1 AND PL2 AND match the APACL1 AS path access list.

D.

The local preference AND the metric will be set to 100 IF the route matches the PL1 OR PL2 prefix list AND the route must also match the APACL1 AS path access list.

E.

All routes that are not matched by the sequence 10 route map statement will be dropped.

 

Answer: AD

Explanation:http://www.routeralley.com/ra/docs/route_maps.pdf

 

When match criteria is contained within a single line, a logical OR is applied.

 

 

QUESTION 48

When configuring BGP on Cisco IOS XR Software, which address-family is enabled by default?

 

A.

IPv4 unicast

B.

IPv6 unicast

C.

VPNv4

D.

IPv4 unicast and IPv6 unicast

E.

IPv4 unicast and IPv6 unicast and VPNv4

F.

No address-family is enabled by default.

 

Answer: F

Explanation:http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38bg p.pdf

 

An address family must be explicitly configured in the router configuration mode for the address family to be active in BGP. Similarly, an address family must be configured under the neighbor for the BGP session to be established for that address family. An address

 

 

 

family must be configured in router configuration mode before it can be configured under a neighbor.

 

 

QUESTION 49

Refer to the Cisco IOS XR route policy exhibit.

 

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Which two statements are correct? (Choose two.)

 

A.

“test” and “foo” are references to the community sets.

B.

The “match-any” option indicates matching either the standard community or extended community.

C.

Routes that match both the “test” and “foo” conditions will have their local preference set to 20.

D.

All non-matching routes will be permitted.

 

Answer: AD

 

 

QUESTION 50

When redistributing routes into OSPF, which kind of routes will be redistributed by default on Cisco IOS XR Software but will not be automatically redistributed by default on Cisco IOS Software and Cisco IOS XE Software?

 

A.

Type 1 external routes

B.

Type 2 external routes

C.

subnetted routes

D.

/32 host routes

E.

tagged static routes

 

Answer: C

Explanation:

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