Repeater

A piece of a packet. When a router is forwarding an IP packet to a network with a Maximum Transmission Unit smaller than the packet size, it is forced to break up that packet into multiple fragments. These fragments will be reassembled by the IP layer at the destination host. When a network receives a packet larger than its maximum allowable packet size, it breaks it up into two or more fragments. These fragments are each assigned a size (corresponding to the length of the fragment) and an offset (corresponding to the starting location of the fragment).
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A networking device that connects networks that are using different network protocols. A product that enables two dissimilar networks to communicate or interface with each other. In the IP community, an older term referring to a routing device. Today, the term “router” is used to describe nodes that perform this function, and “gateway” refers to a specialpurpose device that performs an application layer conversion of information from one protocol stack to another. Compare with router. Interface providing a compatibility between networks by converting transmission speeds, protocols, codes, or security measures.
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Layer 3 of the OSI model. The OSI layer that is responsible for routing, switching, and subnetwork access across the entire OSI environment. Think of this layer as a post office that delivers letters based on the address written on an envelope.
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A concatenation of “bridge” and “router. ” Used to refer to devices that perform both bridging and routing. A network device that first attempts to route and then defaults to bridging if routing fails.
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(1) Layer 2 of the OSI Reference Model. Provides reliable transit of data across a physical link. The datalink layer is concerned with physical addressing, network topology, line discipline, error notification, ordered delivery of frames, and flow control. The IEEE divided this layer into two sublayers: the MAC sublayer and the LLC sublayer. Sometimes simply called the link layer. Roughly corresponds to the datalink control layer of the SNA model. (2) A layer with the responsibility of transmitting data reliably across a physical link (cabling, for example) using a networking technology such as Ethernet. The DLL encapsulates data into frames (or cells) before it transmits it. It also enables multiple computer systems to share a single physical medium when used in conjunction with a media access control methodology such as CSMA/CD.
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