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Cisco 642-883 - Questions & Answers

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Question 1

Single choice

An EIGRP domain is redistributed into an OSPF NSSA area.
On which router would this redistribution occur?

stub border router

summary router

autonomous system boundary router

backbone router

Question 2

Single choice

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?

extcommunity-set rt my-list
65000:10
65000:20
65000:30
end-set
route-policy my-list ($med)
if extcommunity rt matches-within my-list then set met $med

extcommunity-set rt my-list
65000:10
65000:20
65000:30
end-set
route-policy my-list ($med)
if extcommunity rt matches-any my-list then set met $med

extcommunity-set rt my-list
65000:10
65000:20
65000:30
end-set
route-policy my-list ($med)
if extcommunity rt matches-within my-list or med is $med is then set met $med

extcommunity-set rt my-list
65000:10
65000:20
65000:30
end-set
route-policy my-list ($med)
if extcommunity rt matches-any my-list or med is $med then pass

Question 3

Multiple choice

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

BGP network command misconfiguration

route policy misconfiguration

AS number misconfiguration

route map misconfiguration

BGP neighbor peering to wrong IP address

IGP routing problem: not able to reach the source IP address of the BGP open packet

Question 4

Multiple choice

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.)

Enable OSPF synchronization

Implement multi-area OSPF

Enable OSPF sham links to reduce the number of LSAs

Implement route summarization on the ABRs

Enable route leaking between Level 1 and Level 2 areas

Question 5

Single choice

Which option is a mechanism that can be implemented between two eBGP peers to communicate updates that each peer needs from the other?

ORF

route map

ACL

prefix list

Question 6

Multiple choice

Refer to the Cisco IOS route map configuration exhibit.

Which two statements are correct? (Choose two.)

The match prefix-list condition is a logical OR: match prefix list PL1 OR PL2.

All match conditions are logical OR: match prefix list PL1 OR PL2 OR match the APACL1 AS path access list.

The three match conditions are logical AND. match prefix list PL1 AND PL2 AND match the APACL1 AS path access list.

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.

All routes that are not matched by the sequence 10 route map statement will be dropped.

Question 7

Multiple choice

What is the configured IS-IS circuit-type between the CE5 and PE5 routers and between the PE5 and PE6 routers? (Choose two.)

Circuittype L1 between CE5 and PE5 4

Circuittype L1/L2 between CE5 and PE5

Circuittype L2 between CE5 and PE5

Circuittype L1 between PE5 and PE6

Circuittype L1/L2 between PE5 and PE6

Circuittype L2 between PE5 and PE6

Question 8

Multiple choice

What are two purposes of the BGP scan-time command? (Choose two.)

to tune the BGP process which walks the BGP table and confirms the reachability of next hops

to allow faster detection of downed BGP peers

to improve BGP convergence time

to tune the BGP update interval

to decrease the effects of unstable routes by increasing the route suppression time

Question 9

Single choice

Which OSPF feature allows a router with redundant route processors to maintain its OSPF state and adjacencies across planned and unplanned RP switchovers and does this by checkpointing state information from OSPF on the active RP to the standby RP? This feature does not require the OSPF neighbor to support graceful restart.

NSR

NSF

BFD

MTR

SDR

Correct answer: A

Explanation

Continuous Forwarding
An important aspect of high availability is maintenance of traffic forwarding, even in the case of control-plane switchovers. Cisco IOS XR Software has several built-in features that can provide continuous forwarding, including RSP stateful switchover (SSO), Nonstop Forwarding (NSF), Graceful Restart, and
NSR.

NSF: Cisco IOS XR Software supports forwarding without traffic loss during a brief outage of the control plane through signaling and routing protocol implementations for Graceful Restart extensions as standardized by the IETF. In addition to standards compliance, this implementation has been compatibility tested with Cisco IOS Software and third-party operating systems.

Graceful Restart: This control-plane mechanism ensures high availability by allowing detection and recovery from failure conditions while preserving NSF services. Graceful Restart is a way to recover from signaling and control-plane failures without affecting the forwarding plane. Cisco IOS XR Software uses this feature and a combination of check pointing, mirroring, RSP redundancy, and other system resiliency features to recover prior to timeout and avoid service downtime as a result of network reconvergence.
NSR: This feature allows for the forwarding of data packets to continue along known routes while the routing protocol information is being refreshed following a processor switchover.

NSR maintains protocol sessions and state information across SSO functions for services such as Multiprotocol Label Switching (MPLS) VPN. TCP connections and the routing protocol sessions are migrated from the active RSP to the standby RSP after the RSP failover without letting the peers know about the failover. The sessions terminate locally on the failed RSP, and the protocols running on the standby RSP reestablish the sessions after the standby RSP goes active, without the peer detecting the change. You can also use NSR with Graceful Restart to protect the routing control plane during switchovers. The Cisco IOS XR Operating System provides system resiliency through a comprehensive set of high-availability features including modularity, process restart, fault handling, continuous forwarding, and upgradability.

Question 10

Single choice

A network engineer must provide support to a very large customer running a flat IS-IS Level 2 network.
The engineer is willing to redesign the infrastructure in a multiarea fashion due to the rapid growth of the data traffic and newly-required scaling factors.

Which consideration is important when implementing the new IS-IS Level 1 areas?

Two IS-IS Level 1 areas divided by the backbone area require a virtual link to communicate when Level 1/Level 2 intermediate systems are missing.

The default behavior of an IS-IS Level 1 area is equivalent to anOSPF totally stubby area.

An IS-IS Level 1 area will always set a gateway pointing to a backbone router.

An IS-IS Level 1 area provides greater flexibility during the Database Descriptors exchange process.

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