Question 1

What is IPv6 and why was it created?

Accepted Answer

IPv6 (Internet Protocol version 6) is the successor to IPv4. IPv4 supports ~4.3 billion addresses (32-bit); IPv6 supports 3.4 × 10^38 addresses (128-bit). Because IPv4 addresses are nearly exhausted, IPv6 was designed to ensure enough addresses for all future internet-connected devices.

Question 2

What is the compressed form of an IPv6 address?

Accepted Answer

Two shortcuts: 1) Leading zeros in each group are dropped (0042 → 42). 2) One consecutive run of all-zero groups is replaced with :: (2001:0db8:0000:0000:0000:0000:0000:0001 → 2001:db8::1). :: can only appear once per address.

Question 3

Can a device have both an IPv4 and IPv6 address?

Accepted Answer

Yes. Dual-stack devices have both simultaneously. IPv4-mapped IPv6 addresses (::ffff:192.0.2.1) allow IPv6 systems to communicate with IPv4-only services. Most modern operating systems are dual-stack by default.

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