What is the maximum TTL value recommended by IANA?

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Multiple Choice

What is the maximum TTL value recommended by IANA?

Explanation:
The key idea is that TTL lives in an IP header as an 8-bit value. An 8-bit field can represent values from 0 up to 2^8 minus 1, which is 255. Routers decrement this value at each hop, and if it reaches zero, the packet is dropped. So the highest possible TTL you can set or observe is 255. IANA does maintain registries of common initial TTLs used by various systems (some start at 64, others at 128 or 255), but that doesn’t change the maximum value that can be carried in the header.

The key idea is that TTL lives in an IP header as an 8-bit value. An 8-bit field can represent values from 0 up to 2^8 minus 1, which is 255. Routers decrement this value at each hop, and if it reaches zero, the packet is dropped. So the highest possible TTL you can set or observe is 255. IANA does maintain registries of common initial TTLs used by various systems (some start at 64, others at 128 or 255), but that doesn’t change the maximum value that can be carried in the header.

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