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It supported 64-bit and 128-bit keys, combining user-configurable and factory-set bits. WEP used the RC4 algorithm for encrypting data, creating a unique key for each packet by combining a new Initialization Vector (IV) with a shared key (it has 40 bits of vectored key and 24 bits of random numbers).
number bit field Size of rest bit field Number of networks Number of addresses per network Start address End address A 0 8 24 128 (2 7) 16 777 216 (2 24) 0.0.0.0 127.255.255.255 B 10 16 16 16 384 (2 14) 65 536 (2 16) 128.0.0.0 191.255.255.255 C 110 24 8 2 097 152 (2 21) 256 (2 8) 192.0.0.0 223.255.255.255
In Internet networking, a private network is a computer network that uses a private address space of IP addresses.These addresses are commonly used for local area networks (LANs) in residential, office, and enterprise environments.
100.64.0.0/10 100.64.0.0–100.127.255.255 4 194 304: Private network Shared address space [4] for communications between a service provider and its subscribers when using a carrier-grade NAT: 127.0.0.0/8 127.0.0.0–127.255.255.255 16 777 216: Host Used for loopback addresses to the local host [1] 169.254.0.0/16 169.254.0.0–169.254.255.255 ...
The 128 highest addresses within each / 64 subnet prefix are reserved to be used as anycast addresses. [27] These addresses usually have the first 57 bits of the interface identifier set to 1, followed by the 7-bit anycast ID. Prefixes for the network can be of any length for routing purposes, but subnets are required to have a length of 64 bits.
A compliant IPv6 subnet always uses addresses with 64 bits in the host identifier. [12] Given the address size of 128 bits, it therefore has a /64 routing prefix. Although it is technically possible to use smaller subnets, [ 13 ] they are impractical for local area networks based on Ethernet technology, because 64 bits are required for ...
The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address.
The value in the IHL field must include sufficient extra 32-bit words to hold all options and any padding needed to ensure that the header contains an integral number of 32-bit words. If IHL is greater than 5 (i.e., it is from 6 to 15) it means that the options field is present and must be considered.