642-883 Guide

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2021 Nov 642-883 free download

Q1. Which option is where BGP graceful restart is negotiated between peers? 

A. open message 

B. keep-alive message 

C. notification message 

D. update message 


Q2. 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: A,C 

Q3. When using the Cisco IOS XR route policy language to define a logical if-then-else condition, which logical operator has the highest precedence? 


B. OR 


D. IS 

E. IN 



http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3rpl.ht ml 

C:\Documents and Settings\user-nwz\Desktop\1.JPG 

Q4. Which high-availability routing feature requires the neighbor router to support the graceful restart capability? 







On Cisco IOS XR software, NSF minimizes the amount of time a network is unavailable to its users following a route processor (RP) failover. The main objective of NSF is to continue forwarding IP packets and perform a graceful restart following an RP failover. 

When a router restarts, all routing peers of that device usually detect that the device went down and then came back up. This transition results in what is called a routing flap, which could spread across multiple routing domains. Routing flaps caused by routing restarts create routing instabilities, which are detrimental to the overall network performance. NSF helps to suppress routing flaps in NSF-aware devices, thus reducing network instability. 

NSF allows for the forwarding of data packets to continue along known routes while the routing protocol information is being restored following an RP failover. When the NSF feature is configured, peer networking devices do not experience routing flaps. Data traffic is forwarded through intelligent line cards while the standby RP assumes control from the failed active RP during a failover. The ability of line cards to remain up through a failover 

and to be kept current with the Forwarding Information Base (FIB) on the active RP is key 

to NSF operation. 

When the Cisco IOS XR router running IS-IS routing performs an RP failover, the router 

must perform two tasks to resynchronize its link-state database with its IS-IS neighbors. 

First, it must relearn the available IS-IS neighbors on the network without causing a reset of 

the neighbor relationship. Second, it must reacquire the contents of the link-state database 

for the network. 

The IS-IS NSF feature offers two options when configuring NSF: 


.Cisco NSF 

If neighbor routers on a network segment are NSF aware, meaning that neighbor routers are running a software version that supports the IETF Internet draft for router restartability, they assist an IETF NSF router that is restarting. With IETF NSF, neighbor routers provide adjacency and link-state information to help rebuild the routing information following a failover. In Cisco IOS XR software, Cisco NSF checkpoints (stores persistently) all the state necessary to recover from a restart without requiring any special cooperation from neighboring routers. The state is recovered from the neighboring routers, but only using the standard features of the IS-IS routing protocol. This capability makes Cisco NSF suitable for use in networks in which other routers have not used the IETF standard implementation of NSF 

Q5. 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: C,D 

Leading 642-883 real exam:

Q6. Refer to the IS-IS configuration exhibit. 

This is the typical IS-IS configuration of the routers in an AS using IS-IS as the IGP. This AS is in the transition phase of integrating IPv6 into the network. During this transition phase, some of the routers within the AS might be running IPv4 only, some might be running IPv6 only, and others might be running both IPv4 and IPv6. To avoid any black holes for the IPv6 traffic, which configuration change can be made? 

A. Disable IS-IS adjacency checks. 

B. Enable IPv6 adjacency over IPv4 IS-IS peering. 

C. Enable multi-topology IS-IS. 

D. Disable the IPv4 unicast address-family. 

E. Enable IS-IS wide metric to support the single-topology mode. 


Q7. Refer to the exhibit. 

Which configuration is correct for XR4 for an e-BGP session with R1? 

A. router bgp 100 neighbor remote-as 100 

B. router bgp 100 neighbor remote-as 10 address-family ipv4 unicast 

C. router bgp 100 address-family ipv4 unicast neighbor remote-as 100 address-family ipv4 unicast 

D. router bgp 100 address-family ipv4 unicast neighbor remote-as 100 


Q8. Refer to the exhibit. 

R1 and XR2 cannot establish OSPF adjacency. Which option is the root cause of this issue? 

A. stub flag mismatch 

B. mismatched passwords 

C. process ID mismatch 

D. mismatched authentication types 

E. MTU mismatch 


Q9. Refer to the 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 router..RP/0/RSP0/CPU0:P1(config#bfd fast-detect 

E. 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 



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 

Q10. In an AS with 10 routers running IBGP, how many IBGP sessions will be required to establish fully meshed IBGP peerings? 

A. 10 

B. 20 

C. 45 

D. 50 

E. 99 

F. 100 


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