1) biometric security measures: It measures the percent of invalid inputs which are incorrectly accepted. 

2) cable modem: A cable modem is a type of network bridge and modem that provides bi-directional data communication

3) client: The client–server model of computing is a distributed application structure that partitions tasks 

4) network server: A network server is a computer that provides various shared resources to workstations and other servers on a computer network.

5) communication channels: it is a pathway over which data are transferred between remote devices.

6) digital subscriber line: is a family of technologies that provides digital data transmission over the wires of a local telephone network.

7) extra-net: An extra-net is a computer network that allows controlled access from the outside, for specific business or educational purposes.

8) firewall: A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications.

9) hacker: a person in one of several distinct (but not completely disjoint) communities and subcultures

10) hub: is a device for connecting multiple twisted pair

11) internet: The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite

12) intranet: An intranet is a private computer network that uses Internet Protocol technology to securely share any part of an organization's information

13) local area connector: is a computer network that connects computers and devices in a limited geographical area

14) modem: A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information.

15) node: a node is a connection point, either a redistribution point or an end point for data transmissions.

16) peer-peer network: Peer to peer networks share responsibility for processing data among all of the connected devices

17) proxy network: A proxy server connecting an internal network and the Internet

18) public switched telephone network: The public switched telephone network (PSTN) is the network of the world's public circuit-switched telephone networks.

19) router: a device that fowards data packets between computer network

20) server: Server is a commercial food serving equipment manufacturer for the foodservice industry.

21) server operating system: a server OS's ability to run the applications you need is obviously crucial.

22) t-1 line: A T1 line is a high-performance fiber optic telephone line.

23) wide area network: A wide area network (WAN) is a computer network that covers a broad area

24) wimax: WiMAX (Worldwide Interoperability for Microwave Access) is a telecommunications protocol that provides fixed and mobile Internet access.

25) wireless internet service providers: Wireless Internet Service Providers (WISPs) are internet service provice with networks built around wireless networking.

26) wireless LAN: A wireless local area network (WLAN) links two or more devices using some wireless distribution method.