200-301 · Question #682
How many bits represent network id in a IPv6 address?
The correct answer is C. 64. In an IPv6 address, the network ID, also known as the network prefix, is conventionally represented by the first 64 bits of the address.
Question
Options
- A32
- B48
- C64
- D128
How the community answered
(54 responses)- A2% (1)
- B2% (1)
- C91% (49)
- D6% (3)
Why each option
In an IPv6 address, the network ID, also known as the network prefix, is conventionally represented by the first 64 bits of the address.
32 bits is the total length of an IPv4 address, not the network ID portion of an IPv6 address.
While a /48 prefix is common for enterprise global routing prefixes, the standard network ID for a specific subnet in IPv6 is 64 bits.
IPv6 addresses are 128 bits in length, and by standard convention (RFC 4291), the first 64 bits are designated as the network prefix, which uniquely identifies the network segment.
128 bits represents the entire IPv6 address, encompassing both the network prefix and the interface identifier, not solely the network ID.
Concept tested: IPv6 address structure and network prefix length
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/ipv6/ipv6-overview
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