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The size of an IP address in IPv6 is _________

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The size of an IP address in IPv6 is _________

(a) 4bytes

(b) 128bits

(c) 8bytes

(d) 100bits

I got this question during an interview.

My question is based upon IPV4 and IPV6 Comparision in portion TCP/IP Protocol Suite of Computer Network

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Best answer
Correct choice is (b) 128bits

The best I can explain: An IPv6 address is 128 bits long. Therefore, 2^128 i.e. 340 undecillion unique addresses are available in IPv6. IPv4 has only 4 billion possible addresses and IPv6 would be a brilliant alternative in case IPv4 runs out of possible new addresses.

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