Marking Period 3 Vocabulary Words set #1

You are to define each word on your blog.
Each definitions must be accompanied by a image that explains the concept.
All this vocabulary words are relate to Network Fundamentals.
1) Biometric Security Measures
2) Cable Modem
3) Client
4) Client/ Server Network
5) Communication Channels
6) Digital Subscriber Line (DSL)
7) Extranet
8) Firewall
9) Hacker
10) Hub
11) Internet
12) Intranet
13) Local Area Conector (LAN)
14) Modem
15) Node
16) Peer-Peer Network
17) Proxy Server
18) Public Switched Telephone Network (PSTN)
19) Router
20) Server
21) Server Operating System
22) T-1 Line
23) Wide area Network (WAN)
24) WiMax
25) Wireless Internet Service Provider(WISP)
26) Wireless LAN (WLAN)