Cisco 642-883 Tutorials 2021

NEW QUESTION 1
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 2
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.

Answer: B

NEW QUESTION 3
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 4
Refer to the 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 5
When redistributing routes into OSPF, which kind of routes will be redistributed by default on Cisco IOS XR Software but will not be automatically redistributed by default on Cisco IOS Software and Cisco IOS XE Software?

• A. Type 1 external routes
• B. Type 2 external routes
• C. subnetted routes
• D. /32 host routes
• E. tagged static routes

Answer: C

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 6
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 7
Which three statements are true regarding the OSPF router ID? (Choose three.)

• A. The OSPF routing process chooses a router ID for itself when it starts up.
• B. The router-id command is the preferred procedure to set the router ID.
• C. If a loopback interface is configured, its address will always be preferred as the router ID over any other methods.
• D. After the router ID is set, it does not change, even if the interface that the router is using for the router ID goes dow
• E. The router ID changes only if the router reloads or if the OSPF routing process restarts.
• F. In OSPF version 3, the OSPF router ID uses a 128-bit number.

Answer: ABD

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
When implementing OSPF, which type of networks require DR/BDR election?

• A. point-to-point networks
• B. mutli-access broadcast networks
• C. non-broadcast multi-access networks (Hub and Spoke Frame Relay) using point-to- multipoint OSPF network type
• D. All networks type

Answer: B

NEW QUESTION 10
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 11
Refer to the exhibit.

R1 is advertising subnets 1.1.1.X/32 via eBGP. XR4 must accept only the first seven subnets in its BGP table. Which configuration must occur on XR2 to meet these parameters?

• A. route-policy INBOUNDif destination in SUBNETS then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• B. route-policy INBOUNDif destination in FILTER then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• C. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy FILTER in
• D. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy SUBNETS in

Answer: B

NEW QUESTION 12
A service provider is about to purchase more IPv4 address space. Which organization can facilitate this purchase?

• A. APNIC
• B. IETF
• C. USANOG
• D. IEEE
• E. NANOG

Answer: A

NEW QUESTION 13
DRAG DROP

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Weight Local-Preference
As-Path MED

NEW QUESTION 14
How many total OSPF virtual links are configured in this multiarea OSPF network which supports both OSPFv2 and OSPFv3 for IPv4 and IPv6 routing?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: B

Explanation:
#Show running-config | include virtual – check how many router having “virtual “ entry

NEW QUESTION 15
A network engineer wants to set the local preference to 100 for the community set list lowpri-communities. Which option can the engineer use to implement this through RPL?

• A. route-policy ch-prefif community neq lowpri-communities thenset local-preference 100endifend-policy
• B. route-policy ch-prefif community matches –any lowpri-communities thenset local- preference 100endifend-policy
• C. route-policy ch-prefif communitymatches lowpri-communities thenset local-preference 100endifend-policy
• D. route-policy ch-prefif community matches eq lowpri-communities thenset local- preference 100endifend-policy

Answer: B

NEW QUESTION 16
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 17
Refer to the show command output in the exhibit.

For which reason will this router drop all traffic that is destined to the 1.1.1.0/24 network?

• A. The 1.1.1.0/24 route is not synchronized.
• B. The BGP next hop for reaching the 1.1.1.0/24 network is not reachable.
• C. The metric of the 1.1.1.0/24 route is set to 0.
• D. The weight of the 1.1.1.0/24 route is set to 0.
• E. The 1.1.1.0/24 route is an incomplete route.
• F. The IBGP split-horizon rule is preventing the router to use the IBGP route.

Answer: B

NEW QUESTION 18
Refer to the exhibit.

Routers B and C in transit AS 200 are the exit points toward AS 100 and AS 300. Router B is running Cisco IOS XR and Router C IOS XE. Internally, AS 200 runs OPSF only for internal routing. Which two methods can an engineer use to ensure proper reachability between AS 100 and AS 300 for the needed routes? (Choose two.)

• A. Router B: router ospf 200redistribute bgp 200 tag 20router bgp 200address-family ipv4 unicast redistribute ospf 200 metric-type 2
• B. Router B: router ospf 200redistribute bgp 200router bgp 200address-family ipv4 unicast redistribute ospf 200
• C. Router C: router ospf 200redistribute bgp 200 metric-type 1 subnets tag 200router bgp 200 address-family ipv4 redistribute ospf 200
• D. Router C: router ospf 200redistribute bgp 200 metric-type 1 subnets tag 200router bgp 200 address-family ipv4redistribute ospf 200 match external 2
• E. Router C: router ospf 200redistribute bgp 200 metric-type 1 subnets tag 200router bgp 200 address-family ipv4redistribute ospf 200 route-map match-tag match external route-map match-tag deny 10match tag 200

Answer: AD

NEW QUESTION 19
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 20
A network engineer wants to set the local preference to 100 for the specific BGP community sets of 100:1, 101:1, and 102:1. Which option can the engineer use to implement this through RPL, where the BGP community set list is made by the name of lowpri-communities?

• A. route-policy ch-prefif community matches lowpri-communities then set local-preference 100endifend-policy
• B. route-policy ch-prefif community eq lowpri-communities then set local-preference 100endifend-policy
• C. route-policy ch-prefif community matches-any lowpri-communities then set local-preference 100endifend-policy
• D. route-policy ch-prefif community neq lowpri-communities then set local-preference 100endifend-policy

Answer: C

NEW QUESTION 21
Which two statements regarding OSPFv2 or OSPFv3 authentication are correct? (Choose two.)

• A. OSPFv2 supports MD5 authentication.
• B. OSPFv2 supports MD5 or SHA authentication.
• C. OSPFv2 relies on the native security stack that uses IPsec.
• D. OSPFv3 supports MD5 authentication.
• E. OSPFv3 supports MD5 or SHA authentication.
• F. OSPFv3 relies on the native security stack that uses IPsec.

Answer: AF

NEW QUESTION 22
DRAG DROP

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Matches the end of the AS Path String ---$ Matches the Start of the AS Path String ----^
Matches any single character --- . Matched any delimiter ---- -

NEW QUESTION 23
Refer to the Cisco IOS-XR route policy exhibit.

Which statement correctly describes this route policy?

• A. The pass action is required after each of the set community statements to make this route policy functional.
• B. If a route has both the 11:11 and 22:22 communities (or 44:44 and 22:22), the router adds the 55:55 community only.
• C. If a route contains the 11:11 or 44:44 community, the router adds the 55:55 community and continue
• D. Additionally, if the same route also contains the 22:22 community, the router also adds another 77:77 community to the same route.
• E. If a route only has the 22:22 community, then no community will be added by the router.
• F. If a route only has the 11:11 or 44:44 community, then no community will be added by the router.

Answer: B

NEW QUESTION 24
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 25
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