642-883 | Certified 642-883 Preparation 2021

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NEW QUESTION 1
An engineer is configuring an eBGP peering session. What is the default TTL value?

  • A. 1
  • B. 64
  • C. 127
  • D. 255

Answer: A

NEW QUESTION 2
Which type of ISP must rely entirely on other ISPs for Internet transit?

  • A. Tier 3
  • B. Tier 4
  • C. Tier 2
  • D. Tier 1

Answer: A

NEW QUESTION 3
Refer to the exhibit.
642-883 dumps exhibit
Which configuration is correct for XR4 for an e-BGP session with R1?

  • A. router bgp 100neighbor 10.10.14.1remote-as 100
  • B. router bgp 100neighbor 10.10.14.1remote-as 10address-family ipv4 unicast
  • C. router bgp 100address-family ipv4 unicast neighbor 10.10.14.1remote-as 100address-family ipv4 unicast
  • D. router bgp 100address-family ipv4 unicast neighbor 10.10.14.1remote-as 100

Answer: C

NEW QUESTION 4
Refer to the exhibit.
642-883 dumps exhibit
XR1 must have XR4 as the primary exit point for only the first three subnets received from AS 100 and may not impact the rest of the subnets. Which configuration on XR1 is correct?

  • A. prefix-set PREFER 100.100.100.0/30 le 32route-policy LPif destination in PREFER then set local-preference 200 endif
  • B. route-policy LPif destination in (100.100.100.0/30 le 32) then set local- preference 200 else pass endif
  • C. prefix-set PREFER 100.100.100.0/29 le 32route-policy LPif destination in PREFER then set local-preference 200 else pass endif
  • D. route-policy LPif destination in (100.100.100.0/29 le 32) then set local preference 200 else set local-preference 100 endif

Answer: B

NEW QUESTION 5
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 10.10.10.1area 0interface GigabitEthernet 0/0/0/1 area 1stub no-summaryinterface GigabitEthernet 0/0/0/2
  • B. router ospfv3 1 router-id 10.10.10.1default-information originate area 0interface GigabitEthernet 0/0/0/1 area 1stubinterface GigabitEthernet 0/0/0/2
  • C. ipv6 prefix-list default permit ::0/0 router ospfv3 1router-id 10.10.10.1default-information originate area 0interface GigabitEthernet 0/0/0/1 distribute-list prefix-list default in area 1interface GigabitEthernet 0/0/0/2
  • D. router ospfv3 1 router-id 10.10.10.1area 0interface GigabitEthernet 0/0/0/1area 1interface GigabitEthernet 0/0/0/2 no-summarypassive
  • E. router ospfv3 1 router-id 10.10.10.1area 0interface GigabitEthernet 0/0/0/1 area 1stubinterface GigabitEthernet 0/0/0/2 default-cost 20

Answer: A

NEW QUESTION 6
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

Answer: BD

NEW QUESTION 7
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 8
An engineer wants to define a route policy that sets MED to a given value in case the extended community attributes of a network prefix match at least one of the values: 65000:10, 65000:20, or 65000:30. Which configuration accomplishes this task?

  • A. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-within my-list then set met $med
  • B. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-any my-list then set met $med
  • C. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-within my-list or med is $med is then set met $med
  • D. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-any my-list or med is $med then pass

Answer: B

NEW QUESTION 9
Which configuration implements the most secured OSPF authentication mode on Cisco IOS XE?

  • A. interface Gi0/0/0/0ip ospf authentication message-digest ip ospf message-digest-key 1 md5 cisco
  • B. router ospf 1 area 1authentication message-digest interface GigabitEthernet0/0/0/0 message-digest-key 1 md5 cisco
  • C. router ospf 1 area 1interface GigabitEthernet0/0/0/0 authentication message-digest message-digest-key 1 md5 cisco
  • D. router ospf 1area 1 authenticationinterface GigabitEthernet0/0/0/0 ip ospf authentication-key cisco
  • E. interface Gi0/0/0/0 ip ospf authenticationip ospf authentication-key cisco

Answer: A

NEW QUESTION 10
What is the default OSPF seed metric and type?

  • A. 10 and E1
  • B. 10 and E2
  • C. 20 and E1
  • D. 20 and E2
  • E. 0 and E1
  • F. 0 and E2

Answer: D

NEW QUESTION 11
What are two purposes of the BGP scan-time command? (Choose two.)

  • A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
  • B. to allow faster detection of downed BGP peers
  • C. to improve BGP convergence time
  • D. to tune the BGP update interval
  • E. to decrease the effects of unstable routes by increasing the route suppression time

Answer: AC

Explanation:
http://www.networkers-online.com/blog/2008/12/bgp-performance-tunning-convergence-stability-scalabilityand-nsf-part-2/
Background BGP scanner
It is responsible for BGP housekeeping by scanning both the BGP RIB and the IP RIB and cleaning and sorting things out.
BGP monitors the next hop of the installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner polls the RIB for this information every 60 seconds.
During the 60 second time period between scan cycles, IGP instabilities or other network failures can cause temporarily black holes and routing loops.
NOTE With Cisco IOS the default timer is 60 seconds for the IPv4 address family and 15 seconds for the
VPNv4 address family in order to optimize the VPNs routing table convergence. This timer can be controlled via the following command:
Router(config-router)#bgp scan-time <5-60>

NEW QUESTION 12
Which option describes a function of an OSPF virtual link?

  • A. Create redundant path between an area and the backbone.
  • B. Provide a backdoor link for traffic to flow through between areas.
  • C. Connect the two parts of a partitioned backbone through a nonbackbone area.
  • D. Create a virtual connection between two routers from different areas.

Answer: C

NEW QUESTION 13
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 14
Which option is a tool that is used to ensure that BGP AS does not become a transit AS?

  • A. as-path filter-list
  • B. local-preference
  • C. ttl-security
  • D. confederations

Answer: A

NEW QUESTION 15
Refer to the exhibit.
642-883 dumps exhibit
Assume that XR2 and R3 have been configured correctly for OSPF area 0. Which command is needed to configure XR2 as an ABR between area 0 and area 1?

  • A. router ospf 1address-family ipv4interface GigabitEthernet0/0/0/1area 1
  • B. router ospf 1area 1interface GigabitEthernet0/0/0/1
  • C. router ospf 1area 1network 10.10.12.0 0.0.0.255
  • D. router ospf 1interface GigabitEthernet0/0/0/1area 1

Answer: B

NEW QUESTION 16
Refer to the exhibit.
642-883 dumps exhibit
Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?

  • A. bfd fast-detect also needs to be enabled globally under router ospf 100. RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect
  • B. bfd fast-detect also needs to be enabled for the OSPF area under area 0. RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect
  • C. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1.RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect
  • D. bfd fast-detect also needs to be enabled globally on the route
  • E. RP/0/RSP0/CPU0:P1(config#bfd fast-detect
  • F. bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface gi0/3/0/1.RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect

Answer: C

Explanation:
bfd fast-detect
To enable Bidirectional Forwarding Detection (BFD) to detect failures in the path between adjacent forwarding engines, use the bfd fast-detect command in the appropriate configuration mode. To return the software to the default state in which BFD is not enabled, use the no form of this command.
bfd fast-detect [disable | ipv4] no bfd fast-detect

NEW QUESTION 17
Which two of the following are true regarding the BGP Prefix-Based outbound route filtering feature? (Choose two.)

  • A. IP multicast routes are not supported.
  • B. Outbound route filtering is configured only on a per-address family basis.
  • C. Outbound route filtering can be configured for either iBGP or eBGP sessions.
  • D. The outbound route filter can be defined in a Prefix list, Distribute list or Access lists.
  • E. Outbound route filtering is more effective when a distance vector IGP is used.

Answer: AB

Explanation:
http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fsbgporf.pdf
Restrictions for BGP Prefix-Based Outbound Route Filtering
• The BGP Prefix-Based Outbound Route Filtering feature does not support IP multicast routes.
• IP addresses that are used for outbound route filtering must be defined in an IP prefix-list. BGP distribute lists and IP access lists are not supported.
• Outbound route filtering is configured on only a per-address family basis and cannot be configured under the general session or BGP routing process (Router(config-router)#).
• Outbound route filtering is configured for only external peering sessions.

NEW QUESTION 18
An engineer has two routers multihomed to the Internet via BGP. The first should be the primary path for all outbound traffic and the second should automatically become active in the event the primary goes offline. Which method to configure the routers is the most simple?

  • A. Set the local-preference to be higher on the primary router.
  • B. Set the local-preference to be lower on the primary router.
  • C. Set the MED to be higher on the primary router than the backup.
  • D. Set the primary router to have a higher weight than the backup.

Answer: A

NEW QUESTION 19
Which of the following is a characteristic of dual-multihomed connectivity between an enterprise network and the service provider network or networks?

  • A. An enterprise network that is connected to two or more different service providers with two or more links per service provider and using BGP to exchange routing updates with the service providers.
  • B. Each service provider announces a default route on each of the links that connect to the customer with a different metric.
  • C. An enterprise network announces a default route to each service provider.
  • D. Load balancing can be achieved using the maximum-paths command.

Answer: A

NEW QUESTION 20
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 21
Which three potential issues can cause an OSPF adjacency to not come up? (Choose three.)

  • A. wrong area configured on OSPF peers
  • B. wrong authentication key configured on OSPF peers
  • C. different OSPF instance numbers configured on OSPF peers
  • D. different OSPF instances and VRFs configured with the command: router ospf<number1> vrf <number2>
  • E. having the no passive-interface statement configured for the interfaces on which OSPF adjacencies are expected to form
  • F. Layer 2 connectivity problems on the shared medium of the participating OSPF-enabled routers

Answer: ABF

NEW QUESTION 22
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