642-883 Exam - Deploying Cisco Service Provider Network Routing (SPROUTE)

NEW QUESTION 1
When using the show bgp ipv6 unicast summary command to verify the IPv6 BGP session status with the IPv6 BGP peers, you noticed the "St/PfxRcd" status for one of the IPv6 BGP peers is in the "Active" state. What does the "Active" state indicate?

• A. The IPv6 BGP session has been established with the IPv6 BGP peer.
• B. The router is in the process of sending BGP routing updates to the IPv6 BGP peer.
• C. The router is in the process of establishing the IPv6 BGP session with the IPv6 BGP peer.
• D. The router is exchanging BGP notification messages with its IPv6 BGP peer.

Answer: C

NEW QUESTION 2
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

NEW QUESTION 3
Which three valid session commands are supported by peer session templates? (Choose three.)

• A. local-as
• B. as-override
• C. inherit peer-session
• D. inherit peer-policy
• E. disable-connected-check
• F. route-reflector-client

Answer: ACE

NEW QUESTION 4
In an AS with 10 routers running IBGP, how many IBGP sessions will be required to establish fully meshed IBGP peerings?

• A. 10
• B. 20
• C. 45
• D. 50
• E. 99
• F. 100

Answer: C

NEW QUESTION 5
The Cisco IOS XE Software summary-address router IS-IS configuration command can be used to send a summarized route into which IS-IS hierarchy?

• A. Level 1 only
• B. Level 2 only
• C. Level-1-2 only
• D. Level 1 or Level 2 or Level-1-2

Answer: D

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 6
Refer to the topology diagram in the exhibit.

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.

NEW QUESTION 7
A Cisco IOS XR router is a member in OSPF 1 and EIGRP 100 domains, and needs to redistribute OSPF learned routes into EIGRP. Which configuration achieves this goal?

• A. router eigrp 100address-family ipv4 redistribute ospf 1
• B. router eigrp 100redistribute ospf 1 route-policy OS_INTO_EIGroute-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155
• C. router eigrp 100address-family ipv4redistribute ospf 1 route-policy OS_INTO_EIGroute-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155
• D. router eigrp 100default-metric 100 1 255 1 1500redistribute ospf 1

Answer: C

NEW QUESTION 8
An engineer is deciding what BFD implementation would be most appropriate for a legacy and unstable Packet Over SONET link. Which solution should be suggested?

• A. aggressive timers with the lowest possible multiplier
• B. slow timers withthe lowest possible multiplier
• C. aggressive timers with a very high multiplier
• D. averages of a sequence of ping test response times to the remote peer

Answer: A

NEW QUESTION 9
Which ISP tier, also known as default-free, provides global reachability info?

• A. Tier 1 ISP
• B. Tier 0 ISP
• C. Tier 3 ISP
• D. Tier 2 ISP

Answer: A

NEW QUESTION 10
Which of the following is used by an IS-IS router to detect other IS-IS neighbor routers and to form adjacencies?

• A. ESH
• B. ISH
• C. IIH
• D. PSNP
• E. CSNP

Answer: C

Explanation:
ISIS actually features three different hello types
An ES Hello (ESH) is send by all End Systems, and all IS devices listen for this Hello
An IS Hello (ISH) announces the presence of an IS - An IS Hello is sent by all IS devices, and End Systems listen for these hellos Finally, an IS-to-IS Hello (IIH) is used by an IS to discover other ISes and to form adjacencies with them A router will send an IIH to another router on the link to form or maintain an adjacency, but it will still send an ISH as well in case there are end systems located on that segment

NEW QUESTION 11
Which two unique attributes are used for the loop prevention mechanism when route reflectors are deployed in a network? (Choose two.)

• A. local preference
• B. originator-ID
• C. AS-path
• D. next-hop
• E. origin
• F. cluster-list

Answer: BE

NEW QUESTION 12
Which option is the minimum required configuration to enable PIM on a Cisco IOS XR router interface?

• A. router pim address-family ipv4interface GigabitEthernet0/0/0/0
• B. router piminterface GigabitEthernet0/0/0/0 address-family ipv4enable
• C. router pim address-family ipv4interface GigabitEthernet0/0/0/0 enable
• D. router piminterface GigabitEthernet0/0/0/0 enable
• E. router pim address-family ipv4interface GigabitEthernet0/0/0/0 address-family ipv4enable

Answer: D

NEW QUESTION 13
Refer to the network diagram in the exhibit.

Assuming the IBGP session within AS 64500 was established using the loopback 0 interface between the two routers, by default, what will be the next hop of the routes from AS 64501 when the routes appear on the router running IBGP only in AS 64500?

• A. 192.168.101.11
• B. 192.168.101.10
• C. 10.1.1.1
• D. 10.0.1.1
• E. 10.1.10.1

Answer: A

NEW QUESTION 14
Refer to the PE1 router routing table output exhibit.

What is causing the i su 10.1.10.0/24 [115/30] via 0.0.0.0, 00:40:34, Null0 entry on the PE1 router routing table?

• A. The PE1 router is receiving the 10.1.10.0/24 summary route from the upstream L1/L2 IS-IS router.
• B. The PE1 router has been configured to summarize the 10.1.10.x/32 IS-IS routes to 10.1.10.0/24.
• C. The 10.1.10.0/24 has been suppressed because IS-IS auto-summary has been disabled on the PE1 router.
• D. The 10.1.10.0/24 has been suppressed because of a route policy configuration on the PE1 router.
• E. The 10.1.10.0/24 has been suppressed because the more specific 10.1.10.x/32 IS-IS routes have been configured to leak into the IS-IS non-backbone area.

Answer: B

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 15
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

NEW QUESTION 16
Refer to the exhibit.

R2 does not have R1 1.1.1.1/32 subnet in its BGP table. Which issue can be causing this problem?

• A. XR4 does not have next-hop-self for a R2 iBGP session.
• B. R2 does not have no auto-summary configured.
• C. XR4 drops any update coming from R1.
• D. IPv4 address-family is not enabled on R1.

Answer: C

NEW QUESTION 17
A static default route has been inserted into the configuration of a Cisco IOS XE router. Which option redistributes the route into the local OSPF process?

• A. router ospf 1redistribute static subnets
• B. router ospf 1 redistribute static
• C. router ospf 1redistribute static subnetsdefault-information originate always
• D. router ospf 1network 0.0.0.0 area 0 redistribute static subnets

Answer: C

NEW QUESTION 18
Cisco IOS XE has OSPF area authentication configured for MD5 and interface authentication configured for clear text. Which configuration takes precedence?

• A. null
• B. area
• C. MD5
• D. interface

Answer: D

NEW QUESTION 19
Which configuration is used when matching a prefix-list <name> in a route map?

• A. match ip address prefix-list mylist
• B. match ip address mylist
• C. match ip next-hop mylist
• D. ip local-policy route-map mylist
• E. ip-policy route-map mylist

Answer: A

NEW QUESTION 20
Which option can a network specialist use to configure connected route redistribution inside VRF "TEST" on Cisco IOS XR and allow only the prefix 10.10.10.0/24?

• A. route-policy ALLOW-CONNif destination in PERMIT_PREFIX then passelsedropend-policyprefix-set PERMIT_PREFIX 10.10.10.0/24end-setrouter bgp 65000 vrf TESTrd 65000:10000address-family ipv4 unicastredistribute connected route-policy ALLOW-CONN
• B. route-policy ALLOW-CONNif source in PERMIT_PREFIX then passelsedropend-policyprefix-set PERMIT_PREFIX 10.10.10.0/24end-setrouter bgp 65000 vrf TESTrd 65000:10000address-family ipv4 unicastredistribute connected route-policy ALLOW-CONN
• C. route-policy ALLOW-CONNif protocol is connected and source in PERMIT_PREFIX then passelsedropend-policyprefix-set PERMIT_PREFIX 10.10.10.0/24end-setrouter bgp 65000 vrf TESTrd 65000:10000address-family ipv4 unicastredistribute connected route-policy ALLOW-CONN"
• D. route-policy ALLOW-CONNif route-type is local and destination in PERMIT_PREFIX then passelsedropend-policyprefix-set PERMIT_PREFIX 10.10.10.0/24end-setrouter bgp 65000 vrf TESTrd 65000:10000address-family ipv4 unicastredistribute connected route-policy ALLOW-CONN

Answer: A

NEW QUESTION 21
DRAG DROP

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Totally Stubby Area – O,OIA , OE1 or OE2 types of OSPf routes NSSA Totally Stubby – O, and O*IA types of OSPF routes
Stubby OSPF Area - O, OIA and O*IA types of OSPF routes NSSA – O,OIA , ON1 or ON2 types of OSPF Routes

NEW QUESTION 22
An EIGRP domain is redistributed into an OSPF NSSA area. On which router would this redistribution occur?

• A. stub border router
• B. summary router
• C. autonomous system boundary router
• D. backbone router

Answer: C

NEW QUESTION 23
What are two characteristics of the multihomed customers to service providers connection option? (Choose two.)

• A. Multihomed customers must use a private AS number.
• B. The traffic load can be shared for different destination networks between service providers.
• C. Multihomed customers must receive a full routing table from the service providers.
• D. The routing methodology must be capable of reacting to dynamic change
• E. BGP is used to achieve this flexibility.
• F. Multihomed customers must use a provider-assigned address space.

Answer: BD

NEW QUESTION 24
Refer to the exhibit.

Which Cisco IOS XE command should be added to this configuration for the BFD protocol to operate successfully?

• A. Router1(config-if)#bfd echoRouter2(config-if)#bfd echo
• B. Router1(config-ospf-ar-if)#bfd fast-detectRouter2(config-ospf-ar-if)#bfd fast-detect
• C. Router1(config-router)#bfd all-interfacesRouter2(config-router)#bfd all-interfaces
• D. Router1(config- bfd)#echo-enableRouter2(config- bfd)#echo-enable

Answer: C

NEW QUESTION 25
......