Every host in an IPv4 network has a 1-second resolution

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Every host in an IPv4 network has a 1-second resolution real-time clock with battery backup. Each host needs to generate up to 1000 unique identifiers per second. Assume that each host has a globally unique IPv4 address. Design a 50-bit globally unique ID for this purpose. After what period (in seconds) will the identifiers generated by a host wrap around?

1. 128 seconds
2. 256 seconds
3. 512 seconds
4. None of these

Correct Option: B

Each host has a globally unique IPv4 address.
To design a 50 bit unique Id, 50 bit in the sense (32 + 18)
∴ it shows IP address (32 bit) followed by 18 bits.
1000 unique IDs ⇒ 1sec

∴ 2¹⁸ unique Ids ⇒	2¹⁸	= 2⁸ = 256 seconds
	1000