CCNA 1: Ch. 10 Vocab

Port on Cisco devices to which a terminal or computer with a terminal emulator is connected to the network device in order to communicate and configure the network device.

Channel Service Unit / Data Service Unit

Device that connects a local digital phone loop for a WAN circuit to a serial interface on a network device (typically a router).

Performs physical layer layer1 signaling on WAN circuits.

Data Communications Equipment

Devices and connections of a communications network that comprise the network end of the user-to-network interface.

• Physical connection to the network
• Forwards traffic
• Provides clocking signal used to synch data transmissions between DTE & DCE

Ex: modems, Interface cards, etc...

Data Terminal Equipment

Device at the user end of a user-network interface serving as a data source, destination or both.

Ex: computers, protocol translators, multiplexers, etc...

Connects data network through a DCE device (modem) and uses clocking signals generated by DCE.

Electromagnetic Interference

Interference by magnetic signals caused by the flow of electricity.

Causes reduced data integrity and increased error rates on transmission channels.

{ The electrical current creates magnetic fields, which in turn cause other electrical current in nearby wires. Induced electrical currents can interfere with proper operation of the other wire. }

Glass fibers inside certain cables over which light is transmitted to encode 1s & 0s.

Media-Dependent Interface

Normal mode of operation of Ethernet ports on hubs .

Mapping of the wire pairs used in the hub port is a normal config.

Media-Dependent Interface, Crossover

Alternative operation of Ethernet ports on a hub.

Mapping of the wire pairs used on the hub port is a crossover config. that allows for the use of a straight-through cable. (interconnects a hub to a hub)

Radio Frequency Interference

Radio frequencies that create noise that interferes with information being transmitted across unshielded copper cabling (UTP).

Application that runs a terminal for a remote host such as a router, switch, etc.

34-pin female v.35 serial cable conector