Key Terms

Review the following list of key terms:

• Access method— A procedure for regulating access to the transmission medium.

• CRC (Cyclical Redundancy Check)— A checksum calculation used to verify the contents of a data frame.

• CSMA/CD— The network access method used by ethernet.

• Data frame— A package of data transmitted over an ethernet network.

• Data Link layer— The second layer of the OSI model.

• Ethernet— A very popular LAN architecture, using the CSMA/CD networkaccess method.

• Logical Link Control sublayer— A sublayer of OSI’s Data Link layer that is responsible for error checking and managing links between devices on the subnet.

• Media Access Control sublayer— A sublayer of OSI’s Data Link layer that is responsible for the interface with the network adapter.

• Network architecture— A complete specification for a physical network, including specifications for access method, data frame, and network cabling.

• Physical address— A permanent network address, burned into the adapter card by the manufacturer, that is used to deliver data across the physical network.

• Physical layer— The first OSI layer, responsible for translating the data frame into a bitstream suitable for the transmission medium.

• Preamble— A series of bits marking the beginning of a data frame transmission.