Cisco 642-883 Exam Preparation Syllabus
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Question No. 1
Which AS path access list is used by a multihomed customer to only announce their own address space to their service providers to prevent the multihomed customer from becoming a transit AS?
A. ip as-path access-list permit.*
B. ip as-path access-list permit^$
C. ip as-path access-list permit _$
D. ip as-path access-list permit _^
E. ip as-path access-list permit local-as
F. ip as-path access-list deny.*
Question No. 2
When troubleshooting OSPF neighbor errors, which three verification steps should be considered? (Choose three.)
A. Verify if neighboring OSPF interfaces are configured in the same area.
B. Verify if neighboring OSPF interfaces are configured with the same OSPF process ID
C. Verify if neighboring OSPF interfaces are configured with the same OSPF priority.
D. Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.
E. Verify if neighboring OSPF interfaces are configured with the same area type.
A, D, E Answer:
Question No. 3
Which two features are specific only to Tier 3 providers? (Choose two.)
A. interconnects with Tier Level 1 and Tier Level 2 ISPs in public peering points
B. only purchases transit from other networks to reach the Internet
C. purchases transit and pays settlements to other service providers
D. uses strict route filtering to allow only customer and local routes to be sent to upstream providers
E. receives a full Internet routing table via BGP from its upstream provider, which it can use for load-balancing traffic
B, D Answer:
Question No. 4
When using the Cisco IOS XR route policy language to define a logical if-then-else condition, which logical operator has the highest precedence?
Question No. 5
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
Question No. 6
Which option is where BGP graceful restart is negotiated between peers?
A. open message
B. keep-alive message
C. notification message
D. update message
Question No. 7
On the PE5 router, there are how many IPv4 and IPv6 OSPF neighbors and how many IPv4 OSPF interfaces? (Choose three)
A. Two ipv4 ospf neighbors
B. Three ipv4 ospf neighbors
C. Two ipv6 ospf neighbors
D. Three ipv6 ospf neighbors
E. Three ipv4 ospf interfaces
F. Four ipv4 ospf interfaces
A, E, F Answer:
# show ip ospf neighbor
# show ipv6 ospf neighbor
Question No. 8
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, E Answer:
Question No. 9
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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