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350-501 · Question #51

Which function of the LSA packet pacing feature is true?

The correct answer is B. It ensures that an unstable network with a large amount of updates does not completely consume. LSA packet pacing prevents a sudden influx of LSA updates from overwhelming router resources during periods of network instability by controlling the rate at which LSUs are transmitted.

Networking

Question

Which function of the LSA packet pacing feature is true?

Options

  • AIt determines the minimum amount of time that must pass before accepting the same LSA
  • BIt ensures that an unstable network with a large amount of updates does not completely consume
  • CIt ensures that an unstable link does not result in uncontrolled routing churn which avoids
  • DIt reduces routing protocol churn by reducing network updates during periods of network

How the community answered

(27 responses)
  • A
    4% (1)
  • B
    85% (23)
  • D
    11% (3)

Why each option

LSA packet pacing prevents a sudden influx of LSA updates from overwhelming router resources during periods of network instability by controlling the rate at which LSUs are transmitted.

AIt determines the minimum amount of time that must pass before accepting the same LSA

This describes LSA throttling or holddown timers, which manage the acceptance and re-origination of LSAs, not the rate of their transmission.

BIt ensures that an unstable network with a large amount of updates does not completely consumeCorrect

LSA packet pacing ensures that an unstable network, which might generate a large number of Link-State Advertisement (LSA) updates, does not completely consume router CPU and bandwidth by controlling the rate at which these LSAs are sent out to neighbors.

CIt ensures that an unstable link does not result in uncontrolled routing churn which avoids

This describes SPF (Shortest Path First) throttling or route dampening, which is concerned with reducing routing churn caused by unstable links, rather than the raw transmission rate of LSAs.

DIt reduces routing protocol churn by reducing network updates during periods of network

LSA packet pacing manages the *transmission rate* of LSAs; while it contributes to network stability, it doesn't directly reduce the *amount* of updates or *delay* them in the same way SPF timers do to prevent churn.

Concept tested: LSA packet pacing function

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-mt/irs-15-mt-book/irs-lsaflood-pacing.html

Topics

#OSPF#LSA Pacing#Routing Protocol Stability#Network Performance

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