NO.1 A network specialist is working for a large enterprise that has a BGP-enabled multihomed core
infrastructure. Recently, the ISP that provides Internet connectivity to the company had to
temporarily disable one of the BGP sessions as a result of routers blackholing BGP prefixes in transit.
Which option can the specialist use to avoid this incident in the future?
A. filtering local prefixes outbound
B. using only one router as primary BGP speaker
C. permitting only local prefixes outbound
D. filtering external prefixes inbound
Answer: C

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NO.2 Which option is the minimum required configuration to enable PIM on a Cisco IOS XR router
interface?
A. router pim address-family ipv4 interface GigabitEthernet0/0/0/0
B. router pim interface GigabitEthernet0/0/0/0 address-family ipv4 enable
C. router pim address-family ipv4 interface GigabitEthernet0/0/0/0 enable
D. router pim interface GigabitEthernet0/0/0/0 enable
E. router pim address-family ipv4 interface GigabitEthernet0/0/0/0 address-family ipv4 enable
Answer: D

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NO.3 Under which two conditions does an enterprise require BGP peering with its upstream Internet
provider? (Choose two.)
A. The enterprise has two exit points that are geographically separated and routing must be
controlled so that delay variations are reduced.
B. The enterprise has one exit point and must announce the IP class it has been assigned from its ISP.
C. The enterprise has two Layer 2 links to the upstream ISP in the same location and wants to achieve
redundancy.
D. The enterprise needs a simple and efficient way to ensure proper routing for its AP subnets on its
single ISP link.
E. The enterprise is multihomed to two ISPs and has its own IP space AS number.
Answer: A,E

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NO.4 When configuring Cisco IOS route maps, which command allows the route map processing to
jump to another statement instead of exiting?
A. jump
B. next
C. set
D. continue
E. goto
Answer: D

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Explanation:
Match Operations With Continue Clauses
If a match clause does not exist in the route-map entry but a continue clause does, the continue
clause will be automatically executed and go to the specified route-map entry. If a match clause
exists in a route-map entry, the continue clause is executed only when a successful match occurs.
When a successful match occurs and a continue clause exists, the route map executes the set clauses
and then goes to the specified route-map entry. If the next route map contains a continue clause, the
route map will execute the continue clause if a successful match occurs. If a continue clause does not
exist in the next route map, the route map will be evaluated normally. If a continue clause exists in
the next route map but a match does not occur, the route map will not continue and will "fall
through" to the next sequence number if one exists.
Set Operations With Continue Clauses
Set clauses are saved during the match clause evaluation process and executed after the route-map
evaluation is completed. The set clauses are evaluated and executed in the order in which they were
configured. Set clauses are only executed after a successful match occurs, unless the route map does
not contain a match clause. The continue statement proceeds to the specified route-map entry only
after configured set actions are performed. If a set action occurs in the first route map and then the
same set action occurs again, with a different value, in a subsequent route map entry, the last set
action may override any previous set actions that were configured with the same set command
unless the set command permits more than one value. For example, the set as-path pretend
command permits more than one autonomous system number to be configured.

NO.5 Refer to the network diagram in the exhibit.
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

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NO.6 Which two mandatory tasks must an IS-IS NSF-capable router perform for RP switchover?
(Choose two.)
A. Relearn the available IS-IS neighbors.
B. Reacquire the contents of the LSD.
C. Reset peering with the available IS-IS neighbors.
D. Keep the existing contents of the LSD.
E. Rediscover DIS for each link segment.
Answer: A,B

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NO.7 Which two statements are true about an EBGP session or an IBGP session? (Choose two.)
A. IBGP uses AS-Path to detect routing information loops within the AS.
B. EBGP routes have a default Admin Distance of 20 and IBGP routes have a default Admin Distance
of 200.
C. No BGP attributes are changed in EBGP updates except for the next-hop attribute if next-hop-self
is configured.
D. Routes learned from an EBGP peer not advertised to another EBGP peer to prevent routing
information loops.
E. IBGP uses split horizon to prevent routing information loops; routes learned from an IBGP peer are
not advertised to another IBGP peer.
Answer: B,E

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NO.8 Refer to the exhibit.
R1 is advertising subnets 1.1.1.X/32 via eBGP. XR4 must accept only the first seven subnets in its BGP
table. Which configuration must occur on XR2 to meet these parameters?
A. route-policy INBOUND if destination in SUBNETS then pass endif router bgp 100 neighbor
10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
B. route-policy INBOUND if destination in FILTER then pass endif router bgp 100 neighbor 10.10.14.1
address-family ipv4 unicast route-policy INBOUND in
C. router bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy FILTER in
D. router bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy SUBNETS in
Answer: B

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試験番号：642-885 合格体験談
試験科目：「Deploying Cisco Service Provider Advanced Network Routing」
最近更新時間：2015-07-08
問題と解答：131

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試験番号：642-883 試験対策
試験科目：「Deploying Cisco Service Provider Network Routing (SPROUTE) 」
最近更新時間：2015-07-08
問題と解答：130

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