Refined 642-883 Exam Questions 2021

NEW QUESTION 1
A Network Operation Center requires support to understand OSPFv3 neighborship operations. During a migration, two OSPFv3 routers became adjacent even though no common subnets were configured on the link interfaces. Which statement explains this problem?

• A. This problem is a bug in Cisco IOS XE, which requires a case tobe open with Cisco TAC and an immediate Cisco IOS upgrade to avoid security breaches and rerouting attacks.
• B. IPv6 needs only the link-local address to from an OSPFv3 neighborship.
• C. The Network Operation Center Engineers did not notice a supernet configured on one end of the IPv6 link.
• D. The Network Operation Center Engineers did not add the secondary keyword after the IPv6 address, which causes the router to overwrite the main address.

Answer: B

NEW QUESTION 2
When using the Cisco IOS-XR show bgp command to examine the BGP table, the Metric value being displayed is used to represent which BGP attribute?

• A. Weight
• B. Local Preference
• C. MED
• D. Cost Community

Answer: C

NEW QUESTION 3
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

Answer: AEF

Explanation: # show ip ospf neighbor
# show ipv6 ospf neighbor

NEW QUESTION 4
Which two statements about a transit AS are correct? (Choose two.)

• A. A transit AS has eBGP connection(s) to only one external AS.
• B. Routes between ASs are always exchanged via eBGP.
• C. A transit AS uses an IGP like OSPF or ISIS to propagate the external networks within the transit AS.
• D. Core routers within a transit AS normally use default routing to reach the external networks.
• E. iBGP sessions can be established between non directly connected routers.

Answer: BE

NEW QUESTION 5
When monitoring the OSPF operations in the network, you notice that the OSPF process is not load balancing traffic across multiple OSPF links. Which configuration adjustment could be made to enable the OSPF process to load balance traffic across multiple OSPF links?

• A. Enable BFD on the OSPF interfaces and on the OSPF routing process.
• B. Enable NSR on the OSPF routing process.
• C. Enable NSF on the OSPF routing process.
• D. Adjust the OSPF cost on the OSPF interfaces.
• E. Adjust the OSPF variance parameter.
• F. Use the wide-style OSPF metric instead of the narrow-style OSPF metric.

Answer: D

NEW QUESTION 6
In which network environment is IS-IS adjacency check important?

• A. in a multitopology environment where there are different instances of IS-IS running on the same router
• B. in an IPv4/IPv6 environment and running single-topology IS-IS
• C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router
• D. when IS-IS neighbors are in an NBMA environment like over Frame Relay
• E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN

Answer: B

Explanation:
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NEW QUESTION 7
DRAG DROP

Answer:

Explanation: Match the default Route – ipv4 prefix-list one permit 0.0.0.0/0 Match all routes – ipv4 prefix-list permit 0.0.0.0/0 le 32
Match any host routes - ipv4 prefix-list permit 0.0.0.0/32
Match any /25 to /32 prefixes - ipv4 prefix-list permit 0.0.0.0/0 ge 25

NEW QUESTION 8
Which option is the minimum required configuration to enable PIM on a Cisco IOS XR router interface?

• A. router pim address-family ipv4interface GigabitEthernet0/0/0/0
• B. router piminterface GigabitEthernet0/0/0/0 address-family ipv4enable
• C. router pim address-family ipv4interface GigabitEthernet0/0/0/0 enable
• D. router piminterface GigabitEthernet0/0/0/0 enable
• E. router pim address-family ipv4interface GigabitEthernet0/0/0/0 address-family ipv4enable

Answer: D

NEW QUESTION 9
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.

Answer: C

NEW QUESTION 10
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

Answer: AC

NEW QUESTION 11
Refer to the Cisco IOS show command output shown in the exhibit.

Which of the following statements is correct?

• A. The best path to 10.2.10.1/32 was chosen because of the AS path.
• B. The best path to 10.2.10.1/32 was chosen because of the weight.
• C. The best path to 10.2.10.1/32 was chosen because of the local preference.
• D. The best path to 10.2.10.1/32 was chosen because of the MED.
• E. The best path to 10.2.10.1/32 was chosen because of the route origin.

Answer: B

NEW QUESTION 12
You are implementing OSPF as the IGP using a single OSPF area design. The router
memory usage for OSPF is too high. Which two methods can lower the OSPF memory usage? (Choose two.)

• A. Enable OSPF synchronization
• B. Implement multi-area OSPF
• C. Enable OSPF sham links to reduce the number of LSAs
• D. Implement route summarization on the ABRs
• E. Enable route leaking between Level 1 and Level 2 areas

Answer: BD

NEW QUESTION 13
An engineer is troubleshooting an OSPF adjacency between the R1 and R2 and is seeing the following debug:
R2#debug ip ospf adj
*May 10 17:48:27.459: OSPF: Rcv pkt from 10.1.2.1, FastEthernet1/0 : Mismatch Authentication type. Input packet specified type 1, we use type 2
Which option describes why the adjacency cannot be established?

• A. R1 is configured for plaintext authentication.
• B. R1 is not configured for authentication.
• C. R2 is not configured for authentication.
• D. R2 is configured for plaintext authentication.

Answer: A

NEW QUESTION 14
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 15
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 16
Refer to the exhibit.

A service provider (AS65000) is interconnected to two upstream providers (ISP 1 neighbor IP 192.168.1.1 and ISP 2 neighbor IP 192.168.1.2) via a single link in a peering exchange. Which option can an engineer use to implement nonproprietary policies to make ISP 1 the preferred link for incoming and outgoing traffic from the local SP?

• A. route-map outgoing permit 10set-as –path prepend 65000 65000 65000route-map incoming permit 10set local-preference 1000router bgp 65000neighbor 192.168.1.1 route- map incoming outneighbor 192.168.1.1 route-map outgoing in
• B. route-map outgoing permit 10set metric 100route-map incoming permit 10set weight 100router bgp 65000neighbor 192.168.1.1 route-map incoming inneighbor 192.168.1.1 route-map outgoing out
• C. route-map outgoing permit 10set-as –path prepend 65000 65000 65000route-map incoming permit 10set local-preference 1000router bgp 65000neighbor 192.168.1.1 route- map incoming inneighbor 192.168.1.2 route-map outgoing out
• D. set-as –path prepend 65000 65000 65000route-map incoming permit 10set weight 100router bgp 65000neighbor 192.168.1.1 route-map incoming inneighbor 192.168.1.1 route-map outgoing out

Answer: A

NEW QUESTION 17
Cisco IOS XE has OSPF area authentication configured for MD5 and interface authentication configured for clear text. Which configuration takes precedence?

• A. null
• B. area
• C. MD5
• D. interface

Answer: D