4A0-105: Nokia Virtual Private LAN ServicesDemo

By Nokia · Question Mode

QuestionQ4

VPLS loop avoidance

For periodic traffic among hosts, which of the following statements about the use of remote and local age timers is true on the Nokia 7750 SR?

  • A The lower the age time, the higher the probability of flooding of unknown traffic.
  • B The higher the age time, the higher the probability of flooding of unknown traffic.
  • C The local and remote age timers are, by default, the same value.
  • D There is no relationship between the age timers and the probability of flooding of unknown traffic.
Explanation

Shorter MAC aging timers remove learned FDB entries sooner when traffic is intermittent. A destination whose entry has aged out is unknown and is normally flooded, so lowering the age time increases the likelihood of unknown-traffic flooding. Nokia recommends setting the remote-age timer longer than the local-age timer to reduce such flooding.

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