GATE CS 2014 Set 3 — Question 37
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Computer Networks → Network Layer: Addressing → IPv4 Addressing
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Question
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?
Correct answer
256 to 256
Solution
To ensure the ID is globally unique, we must include the host's unique IPv4 address.Total ID length = 50 bits.
IPv4 Address length = 32 bits.Bits remaining for local uniqueness = bits.These 18 bits are used to generate unique identifiers within the host. The host generates up to 1000 identifiers per second.Total number of unique values possible with 18 bits = .Since 1000 identifiers are consumed per second, the time to wrap around is:The answer is approximately 262 seconds.
IPv4 Address length = 32 bits.Bits remaining for local uniqueness = bits.These 18 bits are used to generate unique identifiers within the host. The host generates up to 1000 identifiers per second.Total number of unique values possible with 18 bits = .Since 1000 identifiers are consumed per second, the time to wrap around is:The answer is approximately 262 seconds.
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