Download New Updated (July) Cisco 400-101 Actual Test 191-200

Ensurepass

 

 

QUESTION 191

DRAG DROP

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Correct Answer:

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QUESTION 192

DRAG DROP

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Correct Answer:

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QUESTION 193

DRAG DROP

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Correct Answer:

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QUESTION 194

DRAG DROP

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Correct Answer:

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QUESTION 195

DRAG DROP

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Correct Answer:

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QUESTION 196

Refer to the exhibit. Which two pieces of information in this Wireshark capture indicate that you are viewing EIGRP traffic? (Choose two.)

 

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A.

the header length

B.

the protocol number

C.

the destination address

D.

the Class Selector

E.

the source address

F.

the header checksum

 

Correct Answer: BC

Explanation:

EIGRP uses protocol number 88, which shows as EIGRP in the capture. Also, we in the capture that the destination IP address is 224.0.0.10, which is the Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.

 

 

QUESTION 197

When BGP route reflectors are used, which attribute ensures that a routing loop is not created?

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A.

weight

B.

local preference

C.

multiexit discriminator

D.

originator ID

 

Correct Answer: D

Explanation:

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops:

 

Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored.

 

Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html

 

 

QUESTION 198

Refer to the exhibit. Which statement is true about the downward bit?

 

 

A.

It forces the CE router to use a backup link instead of sending traffic via MPLS VPN.

B.

It informs the PE router that the LSA metric has been recently decreased to 1 and that partial SPF calculation cannot be delayed.

C.

It forces the CE router to install the LSA with the downward bit set into its routing table as a discard route.

D.

It informs the PE router that the LSA was already redistributed into BGP by another PE router and that the LSA must not be redistributed into BGP again.

 

Correct Answer: D

Explanation:

From RFC 4577, specifically section 4.2.5.1

When a type 3 LSA is sent from a PE router to a CE router, the DN bit [OSPF-DN] in the LSA Options field MUST be set. This is used to ensure that if any CE router sends this type 3 LS
A to a PE router, the PE router will not redistribute it further.

When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR (Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be ignored by any other PE routers that receive them.

 

 

QUESTION 199

Which regular expression will match prefixes that originated from AS200?

 

A.

^$

B.

^200_

C.

_200$

D.

^200)

E.

_200_

 

Correct Answer: C

Explanation:

Example on how to deny all prefixes originated in Autonomous System 200

router bgp 100

neighbor 10.1.1.1 remote-as 65535

neighbor 10.1.1.1 route-map map1 in

!

route-map map1 permit 10

match as-path 1

!

ip as-path access-list 5 deny _200$

ip as-path access-list 5 permit .*

Reference: http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_book/tsv_r eg_express.html

 

 

QUESTION 200

Which statement describes the difference between a stub area and a totally stub area?

 

A.

The ABR advertises a default route to a totally stub area and not to a stub area.

B.

Stub areas do not allow LSA types 4 and 5, while totally stub areas do not allow LSA types 3, 4, and 5.

C.

Totally stub areas allow limited external routes in the area via a special type 7 LSA, while stub areas do not

D.

Stub areas do not allow external LSAs, ASBR summary LSAs, or summary LSAs with the exception of a default route originated by the ABR via a summary LSA.

 

Correct Answer: B

Explanation:

Reference: http://packetlife.net/blog/2008/jun/24/ospf-area-types/

 

 

 

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