How many bits represent network id in a IPv6 address?
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A. B. C. D.C
The correct answer is D. 128 bits represent the network ID in an IPv6 address.
IPv6 is the latest version of the Internet Protocol (IP) that is designed to replace IPv4. IPv6 addresses are 128 bits long, compared to the 32 bits of IPv4 addresses. The IPv6 address format is divided into two parts: the network ID and the interface ID.
The network ID is the portion of the address that identifies the network to which the device belongs. It is used to route traffic to the correct destination network. The interface ID is the portion of the address that identifies the specific device on the network. It is used to uniquely identify each device on the network.
In IPv6, the network ID is always the leftmost portion of the address, and it is typically represented using a hierarchical structure. The first few bits of the address identify the type of address and the length of the prefix. The remaining bits are used to identify the specific network.
For example, the address 2001:0db8:85a3:0000:0000:8a2e:0370:7334 can be divided into two parts: the network ID (2001:0db8:85a3:0000::) and the interface ID (8a2e:0370:7334). The network ID identifies the network to which the device belongs, while the interface ID identifies the specific device on the network.
In summary, the network ID in an IPv6 address is represented by 128 bits, making option D the correct answer.