JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2024) — Question 46

You configured a GRE tunnel that traverses a path using default MTU settings. You want to ensure that packets are not dropped of fragmented.
In this scenario, what is the maximum packet size that would traverse the GRE tunnel?

Answer options

Correct answer: D

Explanation

The maximum packet size that can successfully traverse a GRE tunnel without fragmentation is 1476 bytes. This is because GRE adds an additional 24 bytes of overhead to the packet, which means that the total packet size should not exceed the standard Ethernet MTU of 1500 bytes. Options A, B, and C either exceed this limit or do not account for the GRE overhead.