1. Biometric Security Measures - It measures the percent of invalid inputs which are incorrectly accepted
2. Cable Modem - is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a cable television
3. Client -a person who seeks the advice of a lawyer
4. Client/ Server Network - is which many less powerful personal computers or workstations are connected
5. Communication Channels -A path for conveying electrical or electromagnetic signals, usually distinguished from other parallel paths.
6. Digital Subscriber Line (DSL) - is a family of technologies that provides digital data transmission over the wires of a local telephone network.
7. Extranet -is a computer network that allows controlled access from the outside, for specific business or educational purposes. 
8. Firewall -a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
9. Hacker -is a person in one of several distinct communities and subcultures
10. Hub -a scheme used for ranking web pages
11. Internet - is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide. 
12. Intranet -is a private computer network that uses Internet Protocol technologies to securely share any part of an organization's information or network operating system within that organization.
13. Local Area Connector (LAN) -is a computer network that connects computers and devices in a limited geographical area such as home, school, computer laboratory or office building.
14. Modem - is a device that modulates an analog carrier signal to encode digital information
15. Node -a region in an electrical circuit where there is no change in potential
16. Peer-Peer Network - is a distributed application architecture that partitions tasks or work loads between peers.
17. Proxy Server -is a server that acts as an intermediary for requests from clients seeking resources from other servers.
18. Public Switched Telephone Network (PSTN) - is the network of the world's public circuit-switched telephone networks
19. Router -is an electronic device that intercepts signals on a computer network.
20. Server -carrier-grade computing platform for communications networks
21. Server Operating System -a computer program running as a service, to serve the needs or requests of other programs
22. T-1 Line - a standard digital communications link
23. Wide area Network (WAN) -is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries
24. WiMax -is a telecommunications protocol that provides fixed and fully mobile Internet access
25. Wireless Internet Service Provider(WISP) -are Internet service providers with networks built around wireless networking.
26. Wireless LAN (WLAN) - links two or more devices using some wireless distribution method