VIII Chapter 0011: Summary
In this chapter, you learned about the most common types of devices found on a LAN.
At the lowest Physical Layer can be found NICs, hubs, repeaters, MAUs, media filters, transceivers and wireless access points. These devices are the closest to the bare cabling, transmitting and receiving electrical signals (or radio waves) to and from the network.
The next layer up, the Data Link Layer, comprises devices such as switches, bridges and brouters. These devices make decisions about whether data frames can pass through them, based on analysis of the hardware address of the device for which the data is destined, and knowledge of which devices are located on which network segments. Theyre designed to help the network administrator run as efficient as possible a network.
At the Network Layer, there are routers. These devices make decisions about network traffic direction based on higher-level device address information, logical network definitions and administrator-specified preferences as to the route that information should take through the network.
Gateways function at the highest levels, Session, Presentation and Application. They serve to convert from one network device addressing system, network protocol or other application-specific criteria, to another.
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