Cisco 642-883 Free Practice Questions

NEW QUESTION 1
In a Cisco IOS XR OSPF NSF operation, which option is the result of a segment without NSF-capable peers?

• A. NSF is disabled on all segmentson any linecard that has a non-NSF-capable neighbor.
• B. NSF capabilities for that segment are disabled.
• C. NSF operates in unidirectional mode for that segment.
• D. NSF is disabled globally on the router.

Answer: B

NEW QUESTION 2
Which option is where BGP graceful restart is negotiated between peers?

• A. open message
• B. keep-alive message
• C. notification message
• D. update message

Answer: A

NEW QUESTION 3
DRAG DROP
Drag and drop the configuration steps on the left into the correct order on the right for nonstop forwarding for IS-IS on Cisco IOS XR.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Step 1 – conf t Step 2 – router isis Step 3 - nsf
Step 4 – nsf lifetime Step 5 - commit

NEW QUESTION 4
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 5
Refer to the exhibit.

Area 1 routers must have only a default route in their OSPF routing tables. Which configuration must be completed on XR2 to meet this requirement?

• A. router ospf 1 address-family ipv4interface GigabitEthernet0/0/0/1 area 1 stub no-summary
• B. router ospf 1area 1 stub no-summary
• C. router ospf 1 area 1 stubinterface GigabitEthernet0/0/0/1
• D. router ospf 1area 1 stub no-summary interface GigabitEthernet0/0/0/1

Answer: D

NEW QUESTION 6
A service provider has set up new eBGP sessions for new customers who require Internet connectivity for their own public AS sessions. To connect, these sessions require MD5 authentication and no cluster ID configured. The NOC notified that one of these eBGP neighbors does not establish any session with the CE BGP speaker. Which option is a potential cause if the BGP configuration is correct?

• A. The BGPMD5 password has been typed incorrectly producing a failure in the authentication process.
• B. A public AS does not require another service provider to connect to the Interne
• C. The BGP configuration automatically blocks this type of design due to loop-avoidance built-in mechanisms.
• D. The customer BGP speaker is receiving too many prefixes at once and no connection can be established without a maximum –prefix value configured.
• E. No cluster ID is configured, so the BGP process does not find a way to identifythe service provider BGP speaker in the customer BGP route reflectors cluster-lis
• F. The session is not established to keep the customer iBGP core network loop-free.

Answer: A

NEW QUESTION 7
Which two mandatory tasks must an IS-IS NSF-capable router perform for RP switchover? (Choose two.)

• A. Relearn the available IS-IS neighbors.
• B. Reacquire the contents of the LSD.
• C. Reset peering with the available IS-IS neighbors.
• D. Keep the existing contents of the LSD.
• E. Rediscover DIS for each link segment.

Answer: AB

NEW QUESTION 8
Which router(s) is/are IS-Type L1/L2 IS-IS router?

• A. CE5 only
• B. PE6 only
• C. CE5 and PE6 only
• D. PE5 and PE6 only
• E. CE5, PE5 and PE6

Answer: D

Explanation:
#show clns neighbor

NEW QUESTION 9
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 10
Which option is a characteristic of intermediate systems on multiarea IS-IS?

• A. Level 2 contains routing information only for the local area.
• B. Level 2 contains routing information only for stub areas.
• C. Level 1 contains routing information only for the backbone area.
• D. Level 1 contains routing information onlyfor the local area.

Answer: D

NEW QUESTION 11
The S bit in the MPLS header is used for what purpose?

• A. To indicate the bottom level in the label stack
• B. To indicate if LDP is sync to the IGP
• C. To indicate if LDP is sync to the IGP
• D. To indicate the status of the LSP

Answer: A

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG
a 1-bit bottom of stack flag. If this is set, it signifies that the current label is the last in the stack.

NEW QUESTION 12
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 13
Which option is a mechanism that can be implemented between two eBGP peers to communicate the routes each peer needs from the other?

• A. ORF
• B. ACL
• C. prefix list
• D. route map

Answer: A

NEW QUESTION 14
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 15
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 16
Which of the following is used by an IS-IS router to detect other IS-IS neighbor routers and to form adjacencies?

• A. ESH
• B. ISH
• C. IIH
• D. PSNP
• E. CSNP

Answer: C

Explanation:
ISIS actually features three different hello types
An ES Hello (ESH) is send by all End Systems, and all IS devices listen for this Hello
An IS Hello (ISH) announces the presence of an IS - An IS Hello is sent by all IS devices, and End Systems listen for these hellos Finally, an IS-to-IS Hello (IIH) is used by an IS to discover other ISes and to form adjacencies with them A router will send an IIH to another router on the link to form or maintain an adjacency, but it will still send an ISH as well in case there are end systems located on that segment

NEW QUESTION 17
Why would a network engineer want to implement BGP peer groups on Cisco IOS XE routers?

• A. to have a single point of configuration for all route maps used with BGP
• B. to have a single point of configuration for neighbors with the same BGP policies
• C. to have a single point of configuration for all global BGP configurations
• D. to have a single point of configuration for all Layer 3 VPN customer VRFs

Answer: B

NEW QUESTION 18
What are two ways to advertise networks into BGP? (Choose two.)

• A. using the neighbor router BGP command
• B. using a route policy in Cisco IOS XR Software or using a route map in Cisco IOS Software or Cisco IOS XE Software
• C. using route redistribution into BGP
• D. using the network router BGP command
• E. enabling an interface to run BGP using the interface router BGP command

Answer: CD

NEW QUESTION 19
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. originator-ID
• C. AS-path
• D. next-hop
• E. origin
• F. cluster-list

Answer: BE

NEW QUESTION 20
Which two options are characteristics of Nonstop Forwarding and Nonstop routing? (Choose two.)

• A. NSR is graceful redundancy mechanism.
• B. NSR is stateful redundancy mechanism.
• C. NSF is stateful redundancy mechanism.
• D. NSF is graceful redundancy mechanism.

Answer: BD

NEW QUESTION 21
Which configuration is used when matching a prefix-list <name> in a route map?

• A. match ip address prefix-list mylist
• B. match ip address mylist
• C. match ip next-hop mylist
• D. ip local-policy route-map mylist
• E. ip-policy route-map mylist

Answer: A

NEW QUESTION 22
Which value must be configured when redistributing OSPFv2 into RIP?

• A. metric
• B. bandwidth
• C. delay
• D. MTU
• E. reliability

Answer: A

NEW QUESTION 23
How can you prevent multihomed customers with connections to two service providers from acting as a transit AS?

• A. Enable BGP synchronization on all the customer routers
• B. Use MED to influence the inbound traffic from the ISPs
• C. Use static routing to the ISPs
• D. Use an AS-path access-list to filter the BGP updates to the ISPs
• E. Use conditional advertisements when sending BGP updates to the ISPs

Answer: D

NEW QUESTION 24
Refer to the OSPF command exhibit.

Which effect does the no-summary command option have?

• A. It will cause area 1 to be able to receive non-summarized inter-area routes.
• B. It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.
• C. It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.
• D. It will convert the NSSA area into a NSSA totally stubby area.
• E. It will convert the stubby area into a NSSA.
• F. It will disable OSPF auto-summary.

Answer: B

Explanation:

C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 25
On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?

• A. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0!router ospf 1network 10.1.1.1 0.0.0.0 area 0
• B. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0!router ospf 1network 10.1.1.1 255.255.255.255 area 0
• C. router ospf 1 area 0interface GigabitEthernet0/0/0/1
• D. interface gi0/0/0/0ip address 10.1.1.1 255.255.255.0ip ospf 1 area 0
• E. router ospf 1address-family ipv4 unicastinterface GigabitEthernet0/0/0/1 area 0
• F. router ospf 1address-family ipv4 unicast interface GigabitEthernet0/0/0/1 area 0

Answer: C

NEW QUESTION 26
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