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How many bits is an IPv6 address?
A. 32
B. 48
C. 64
D. 128
Correct Answer: D
Explanation/Reference:
Section Reference: Understanding IPv6
Explanation: The top reason to use IPv6 is address space. IPv6 is a 128-bit system, whereas its still-dominant predecessor IPv4 is only a 32-bit system. While IPv4 can have approximately 4 billion IP addresses in the whole system, IPv6 can have 340 undecillion addresses.
Ans D. 128