JN0-351: Enterprise Routing and Switching, Specialist (JNCIS-ENT)Demo

By Juniper · Question Mode

QuestionQ10

Tunnels

What is the largest permitted MTU size for a default GRE tunnel without IPv4 traffic fragmentation?

  • A 1496 bytes
  • B 1480 bytes
  • C 1500 bytes
  • D 1476 bytes
Explanation

Default GRE encapsulation over IPv4 consumes 24 bytes of overhead. A 1500-byte physical IPv4 MTU therefore leaves an inner GRE tunnel IP MTU of 1476 bytes, preventing fragmentation.

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