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642-883 Exam

Cisco 642-883 Cram 2021




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NEW QUESTION 1
In Cisco IOS XE, which option is the default threshold value for slow peer detection?

  • A. 120 seconds
  • B. 180 seconds
  • C. 240 seconds
  • D. 300 seconds

Answer: D

NEW QUESTION 2
Refer to the exhibit.
642-883 dumps exhibit
R2 wants to filter out only routes originated from AS 300. Which AS path access list should be used?

  • A. ip as-path access-list 1 deny_300$
  • B. ip as-path access-list 1 deny^300_
  • C. ip as-path access-list 1 deny ^300$
  • D. ip as-path access-list 1 deny_300_

Answer: C

NEW QUESTION 3
Refer to the BGP and route map configurations exhibit.
642-883 dumps exhibit
When the "setas" route map is applied to the 10.1.1.2 neighbor, the 10.1.1.2 neighbor is not able to receive all the required BGP routes from this router. What could be the problem?

  • A. The BGP session was cleared using the clear ip bgp command after the route map was applied.
  • B. The test1 or test2 prefix-list is misconfigured.
  • C. There is no pass action configured within the route map.
  • D. The route map is missing the route-map setas permit 30 statement.

Answer: D

NEW QUESTION 4
DRAG DROP
642-883 dumps exhibit

  • A. Mastered
  • B. Not Mastered

Answer: A

Explanation:
Only used within an AS and has a default value of 100 – Local Preference Can use the prepending feature to influence inbound traffic flow – AS_Path
The lower of this value is the more desirable value .Used to influence the incoming traffic flow from the neighbor autonomous systems. -- MED
Proprietary to cisco and no sent to any BGP peers. Its local to router only -Weight

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:
642-883 dumps exhibit
C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 6
Refer to the exhibit.
642-883 dumps exhibit
In AS 200, routers B and C are the exit points towards AS 100 and AS 300, respectively. Router B is running Cisco IOS XR and Router C is running Cisco IOS XE. OSPF is used as PE-CE routing protocol. In order to ensure proper reachability between AS 100 and AS 300, which two sets of configuration should an engineer apply? (Choose two.)

  • A. Router B:router ospf 200redistribute bgp 200 subnets!router bgp 200address-family ipv4 unicastredistribute ospf 200
  • B. Router B:router ospf 200redistribute bgp 200 subnets!router bgp 200address-family ipv4 vrf AS 100-AS300redistribute ospf 200
  • C. Router B:router ospf 200 vrf AS 100-AS300redistribute bgp 200!router bgp 200vrf AS 100-AS300address-family ipv4 unicastredistribute ospf 200
  • D. Router C:router ospf 200redistribute bgp 200!router bgp 200address-family ipv4redistribute ospf 200 subnet
  • E. Router C:router ospf 200 vrf AS100-AS300redistribute bgp 200 subnets!router bgp 200vrf AS 100-AS300address-family ipv4unicastredistribute ospf 200
  • F. Router C:router ospf 200 vrf AS100-AS300redistribute bgp 200 subnets!router bgp 200address-family ipv4 vrf AS 100-AS300redistribute ospf 200

Answer: AD

NEW QUESTION 7
Refer to the exhibit.
642-883 dumps exhibit
R2 does not have R1 1.1.1.1/32 subnet in its BGP table. Which issue can be causing this problem?

  • A. There is no route-reflector configuration in AS 100.
  • B. IPv4 address-family isnot enabled on R1.
  • C. R2 does not have next-hop-self for a XR4 iBGP session.
  • D. XR4 drops any update coming from R1 because there is no RPL policy applied.

Answer: D

NEW QUESTION 8
DRAG DROP
642-883 dumps exhibit

  • 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 9
An engineer is using configuration blocks to build policy-based routing. All other traffic must not be affected and the policy must be applied to GigabitEthernet1/0. Which block correctly implements traffic that is destined for 10.10.10.0/24 using a next hop of 192.168.55.1?

  • A. access-list 110 permit ip any 10.10.10.0 0.0.0.255 route-map PBR permit 10match ip address 110set next-hop 192.168.55.1 interface GigabitEthernet1/0 ip policy route-map PBR
  • B. access-list 110 permit ip any 10.10.10.0 0.0.0.255 route-map PBR permit 10match ip address 110set next-hop 192.168.55.1 route-map PBR permit 20 interface GigabitEthernet1/0 ip policy route-map PBR
  • C. access-list 110 permit ip any 10.10.10.0 255.255.255.0 route-map PBR permit 10match ip address 110set next-hop 192.168.55.1interface GigabitEthernet1/0 ip policy route-map PBR
  • D. access-list 110 permit ip any 10.10.10.0 255.255.255.0 route-map PBR permit 10match ip address 110set next-hop 192.168.55.1 route-map PBR permit 20 interface GigabitEthernet1/0 ip policy route-map PBR

Answer: B

NEW QUESTION 10
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 11
A service provider is running BGP with clients at the edge of the network. The service provider sees that routing updates from one site are being dropped when the other site receives them. Which feature fixes this issue?

  • A. EBGP multihop
  • B. inter-AS peering
  • C. AS-override
  • D. allow-AS in

Answer: C

NEW QUESTION 12
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 13
Refer to the Cisco IOS route map configuration exhibit.
642-883 dumps exhibit
Which two statements are correct? (Choose two.)

  • A. The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.
  • B. All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path access list.
  • C. The three match conditions are logical AN
  • D. match prefix list PL1 AND PL2 AND match the APACL1 AS path access list.
  • E. The local preference AND the metric will be set to 100 IF the route matches the PL1 OR PL2 prefix list AND the route must also match the APACL1 AS path access list.
  • F. All routes that are not matched by the sequence 10 route map statement will be dropped.

Answer: AD

Explanation:
http://www.routeralley.com/ra/docs/route_maps.pdf
When match criteria is contained within a single line, a logical OR is applied.

NEW QUESTION 14
Refer to the exhibit.
642-883 dumps 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 15
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 16
Which RPLs can be used to conditionally advertise a default route based on the prefix 1.1.1.1 being in the routing table?

  • A. route-policy RPL_Default_Originate if rib-has-route in (1.1.1.1/32)pass else drop endifend-policy
  • B. route-policy RPL_Default_Originate if rib-has-route in (1.1.1.1/32)drop else pass endifend-policy
  • C. route-policy RPL_Default_Originate if route in (1.1.1.1/32)pass else drop endifend-policy
  • D. route-policy RPL_Default_Originate if not rib-has-route in (1.1.1.1/32)pass else drop endifend-policy

Answer: A

NEW QUESTION 17
Which router has the su 10.5.10.0/24 [20/115] entry pointing to NullO in its routing table and why? (Choose two.)
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit

  • A. CE5
  • B. PE5
  • C. PE6
  • D. The router is summarizing 10.5.10.1/32 into 10.5.10.0/24
  • E. The router is suppressing the 10.5.10.0/24 route
  • F. The L2/L1 IS-IS router is blocking the 10.5.10.0/24 interarea route to the L1-only router

Answer: DF

Explanation:
# show clns route

NEW QUESTION 18
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 140address-family ipv4 unicast neighbor 10.1.1.1remote-as 140address-family ipv4 unicast route-reflector-clientexitaddress-family ipv4 multicast route-reflector-client
  • B. router bgp 140 neighbor 10.1.1.1address-family ipv4 unicast address-family ipv4 multicast remote-as 150route-reflector-client exit
  • C. router bgp 140address-family ipv4 unicast route-reflector-clientaddress-family ipv4 multicast remote-as 140neighbor 10.1.1.1
  • D. router bgp 140address-family ipv4 unicast neighbor 10.1.1.1remote-as 150address-family ipv4 unicast route-reflector-clientexitaddress-family ipv4 multicast route-reflector-client

Answer: A

NEW QUESTION 19
What are three common problems that can cause a BGP neighbor state to toggle between the idle state and the active state? (Choose three.)

  • A. BGP network command misconfiguration
  • B. route policy misconfiguration
  • C. AS number misconfiguration
  • D. route map misconfiguration
  • E. BGP neighbor peering to wrong IP address
  • F. IGP routing problem: not able to reach the source IP address of the BGP open packet

Answer: CEF

NEW QUESTION 20
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 21
......

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