Improve Cisco 642-883 braindumps

Q1. Which two OSPF network scenarios require OSPF virtual link configuration? (Choose two.) 

A. to connect an OSPF non-backbone area to area 0 through another non-backbone area 

B. to connect an NSSA area to an external routing domain 

C. to connect two parts of a partitioned backbone area through a non-backbone area 

D. to enable route leaking from Level 2 into Level 1 

E. to enable route leaking from Level 1 into Level 2 

F. to enable OSPF traffic engineering 

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Q2. An engineer wants to use an address family to configure internal BGP peer 10.1.1.1 as a route reflector client for unicast and multicast prefixes. Which option accomplishes this configuration? 

A. router bgp 140 address-family ipv4 unicast neighbor 10.1.1.1 remote-as 140 address-family ipv4 unicast route-reflector-client exit address-family ipv4 multicast route-reflector-client 

B. router bgp 140 neighbor 10.1.1.1 address-family ipv4 unicast address-family ipv4 multicast remote-as 150 route-reflector-client exit 

C. router bgp 140 address-family ipv4 unicast route-reflector-client address-family ipv4 multicast remote-as 140 neighbor 10.1.1.1 

D. router bgp 140 address-family ipv4 unicast neighbor 10.1.1.1 remote-as 150 address-family ipv4 unicast route-reflector-client exit address-family ipv4 multicast route-reflector-client 

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Q3. Which statement best describes the function of a BGP af-group? 

A. Use templates in different neighbors so it makes the BGP implementation easier. 

B. Group different address family neighbors inside BGP. 

C. Create a group of neighbors that can inherit address family configuration inside BGP. 

D. Substitute the class maps inside BGP on Cisco IOS XR devices. 

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Q4. Which series of commands configures area 1 as an OSPF totally stubby area on a Cisco IOS XR router? 

A. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 stub no-summary interface GigabitEthernet 0/0/0/2 

B. router ospfv3 1 router-id 10.10.10.1 default-information originate area 0 interface GigabitEthernet 0/0/0/1 area 1 stub interface GigabitEthernet 0/0/0/2 

C. ipv6 prefix-list default permit ::0/0 router ospfv3 1 router-id 10.10.10.1 default-information originate area 0 interface GigabitEthernet 0/0/0/1 distribute-list prefix-list default in area 1 interface GigabitEthernet 0/0/0/2 

D. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 interface GigabitEthernet 0/0/0/2 no-summary passive 

E. router ospfv3 1 router-id 10.10.10.1 area 0 interface GigabitEthernet 0/0/0/1 area 1 stub interface GigabitEthernet 0/0/0/2 default-cost 20 

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Q5. 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. 

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Q6. 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 

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Q7. 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 

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Q8. Refer to the Cisco IOS XR route policy exhibit. 

If the original incoming routing update has an MED of 10 and a local preference of 100, how will the routing update be modified? 

A. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 100. 

B. The local preference will be set to 100, the MED will be set to 10, and the weight will be set to 200. 

C. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 100. 

D. The local preference will be set to 200, the MED will be set to 10, and the weight will be set to 200. 

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Q9. Which three statements are correct regarding the OSPF operations? line (Choose three.) 

A. PE5 OSPFv2 and OSPFv3 router id is 10.5.1.1 

B. The OSPF virtual-link cost is 1 

C. Area 3 is a transit area 

D. Area 4 is using MD5 authentication 

E. Area 1 IPv4 and IPv6 networks are not reachable from PE6 

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Q10. An engineer is working for a service provider who is strategically important to the Internet data traffic. The CTO is promoting a core infrastructure upgrade to connect via optical links network service providers. Which three concerns must be addressed while planning the new BGP features and functionalities? (Choose three.) 

A. BGP suboptimal routing 

B. IPv4 exhaustion 

C. routers and switches hardware capabilities 

D. route dampening of current customers 

E. multihoming policies of new customers 

F. IGP reconvergence time on the inter-AS links 

G. BGP blackholing when acting as transit autonomous system 

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