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In computer networking, the default route is a configuration of the Internet Protocol (IP) that establishes a forwarding rule for packets when no specific address of a next-hop host is available from the routing table or other routing mechanisms.
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. This mapping is a critical function in the Internet protocol suite. ARP was defined in 1982 by RFC 826, which is Internet Standard STD 37.
In Internet Protocol version 4 networks, broadcast addresses are special values in the host-identification part of an IP address.The all-ones value was established as the standard broadcast address for networks that support broadcast. [1]
When a broadcast message is sent to the Broadcast Domain via IP Boradcast address 192.168.1.255, one IP address that it reaches is IP address 192.168.1.1, which is mapped to MAC address F0:4D:A2:F4:6F:39 via ARP with a switch. But Broadcast Domains are established by the SUBNET MASK ADDRESS of the Internet Layer, not the Data-link Layer.
One can use the following addresses for hosts, even though they end with 255: 192.168.1.255, 192.168.2.255, etc. ... The Address Resolution Protocol (ARP) performs ...
Network diagram with IP network addresses indicated e.g. 192.168.100.3.. A network address is an identifier for a node or host on a telecommunications network.Network addresses are designed to be unique identifiers across the network, although some networks allow for local, private addresses, or locally administered addresses that may not be unique. [1]
Allowing direct data link layer communication between customer nodes exposes the network to various security attacks, such as ARP spoofing. Controlling the broadcast domain in this fashion provides many of the advantages of a point-to-point network, using commodity broadcast-based hardware.
EtherType is a two-octet field in an Ethernet frame.It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.