|
|
Computer network
A computer network is a system for communication among two or more
computers.
Computer networks may be categorized with respect to range:
* personal area network (PAN)
o wireless PAN
* local area network (LAN)
o wireless LAN
* metropolitan area network (MAN)
* wide area network (WAN)
* (Tiny area network (TAN)
Computer network applications may be categorized with respect to the
functional relationships between components:
* client-server
* multitier architecture
* peer-to-peer
Computer networks may be categorized with respect to network topologies:
* star network
* grid network
* toroidal networks and hypercubes
* tree and hypertree networks
Computer networks may be categorized with respect to specialised functions
* Storage Area Networks
* Server farms
Computer networks may be implemented using a variety of protocol stack
architectures, computer buses or combinations of media and protocol layers,
incorporating one or more of:
* ARCNET
* DECNET
* Ethernet
* IP
* TCP
* Appletalk
* Token Ring
* IPX
* FDDI
* HIPPI
* Myrinet
* ATM
* RS-232
* IEEE-488
* USB
* IEEE 1394, aka Firewire, iLink
* X.25
* Frame relay
* Bluetooth
* IEEE 802.11
* System network architecture
* communication theory
* data transmission
o PSTN the Public Switched Telephone Network
+ Modems and dialup
*
o wireless transmission
+ short range
+ Bluetooth
+ medium range
+ WiFi, 802.11
+ long range
+ satellite
+ MMDS
+ SMDS
+ cellular telephone data transmission
+ CDMA
+ CDPD
+ GSM
+ i-Mode
+ GSM
+ TDMA
+ paging networks
+ DataTAC
+ Mobitex
+ Motient
o Wired Transmission
+ dedicated lines (leased lines)
+ Time-division multiplexing
+ packet switching
+ Frame relay
+ PDH
+ Ethernet
+ RS-232
o Fiber optic transmission
+ SONET / SDH
* Routing
* Bitnet
This content from Wikipedia is licensed under the GNU Free Documentation License.
|
ZoneAlarm Security Suite 2005 - CD OnlyZoneAlarm Security Suite 2005 - CD Only ** ZoneAlarm Security Suite 2005 - CD Only **Why waste another moment worrying about the perils of online computing? The experts at Zone Labs have brought a complete spectrum of security features together in a single, easy-to-use security solution. Internet security is a major concern... but it doesn't have to be a major headache. Protect yourself against critical safety issues—including viruses, hackers and more—with the protection of ZoneAlarm Security Suite. General Features: - Award-winning firewall blocks intruders and shields your computer from attack. - Comprehensive antivirus protection includes automatic updates so you're always protected. - Hacker ID™safeguards your personal information to help you avoid identity theft. - Cookie control, ad blocker, and cache cleaner help you maintain your privacy. - Instant messaging security protects users of the most popular IM services and guards against IM spammers and predators. - Automatic Program Control helps block harmful programs, like spyware, from connecting to the Internet from your computer. - Web site filtering allows offensive or inappropriate content to be blocked. - MailSafe quaratines suspicious email attachments and blocks outbound messages containing potential viruses. Notes:- Picture is for representational purposes only- OEM CD ONLY More ...
Dell Optiplex PII 400MHz 128MB 6.4GB CD 250ZipDell Optiplex PII 400MHz 128MB 6.4GB CD 250Zip ** Dell Optiplex PII 400MHz 128MB 6.4GB CD 250Zip **- Intel Pentium II 400MHz Slot 1 processor- 128MB RAM- 6.4GB Hard Drive- CD-ROM Drive (speed may vary)- Iomega 250MB Zip Drive- 1.44MB Floppy Drive- On board ATi Mach64 AGP chipset w 4MB VRAM (15-pin VGA port)- On board audio (Line in, Line out, Mic. in)- Integrated 10/100 LAN- Two USB ports- Two PS/2 ports- Two Serial ports- One Paralel port- One RJ45 connector (3Com Lucent chipset NIC)- Includes Power Supply (115v-230v)Notes:- NO operating system, monitor, drivers, keyboard, mouse, etc..Compatibility/Requirements/Disclosures:** Requirements *** VGA monitor* Keyboard and mouse* Power cord* Available power outlet** Disclosures *** System is in very good condition* Has cosmetic blemishes, examples of which are (but not limited to):* Missing bezel covers, back plates, expansion slot covers* Scratches in case* Hairline crack in case More ...
Kid Pix Studio Deluxe 3Kid Pix Studio Deluxe 3 Paint, draw, and animate - it's never been easier, or more fun! Empower your young artists with great graphics, sounds, animations, and creative projects. The possibilities are unlimited whether they're 3 or a very cool 12. Windows 98/ME/2000/NT/XP and Mac More ...
Casio KL-100 Label Printer (NEW)Casio KL-100 Label Printer (NEW) ** Casio KL-100 Label Printer **Get rid of the sticky notes, tape and paper to label anything. Featuring the compact labeler from Casio, it prints up to two lines of text, 64 alpha characters, 10 numbers and 41 symbols. Its portable and personal, you can take it anywhere! General Features- Typewriter style keyboard- 64 Alpha Character type- 10 Number type- 41 type symbols- Four-digit LCD Display- Thermal transfer printing type- Approximately 6.76mm/sec- Uses 6/9/12/18mm tape label sizes- Up to 126 text characters- Tape Cutter button- Uses Six (6) AA batteries- AC adapter NOT includedPackage Includes:- Casio KL-100 Label Printer- User's Manual- Black ink catridge NOTES:- Factory new in retail clamshell Compatibility/Requirements/Disclosures:** Requirements *** (6) AA Batteries* OR ** 9VDC AC adapter (not provided) & power outlet (receptacle) More ...
iPod 6-Foot USB and FireWire Cable (White)iPod 6-Foot USB and FireWire Cable (White) ** iPod USB Type A (Male)and 6-pin 1394 Cable **Connect your iPod to your computer to transfer and manage music and even charge the battery. This 6 foot USB and Firewire cable allows you to synchronize your iPod with dock connector through any USB or FireWire connection. Get yours today!General Features:- 6-Foot - White cable- USB Type A Male end- 6-pin FireWire end- iPod dock connectorNotes:- Cable only Compatibility/Requirements/Disclosures: ** Requirements *** Available USB port* Available FireWire port More ...
CM343R Personal MP3 CD Player - 2 for $49.99CM343R Personal MP3 CD Player - 2 for $49.99 ** CM343R Personal MP3 CD Player - 2 for $49.99 **This Classic CM343R Personal MP3 CD Player features anti-shock technology that ensures reliable music without skipping. It is compatible with CD, CD-R, CD-RW, MP3 formats and offers 60 programmable track memory, and super bass boost system. With its portable design, this Classic Personal MP3 CD player lets you enjoy your favorite tunes anywhere!!General Features:- 40-seconds anti-shock MP3 format- 120-seconds anti-shock CD format- Compatible with CD/CD-R/CD-RW/MP3 formats- 60 Programmable Track Memory- Anti-Shock techonology system- Super Bass Boost system- Operates on 2 AA Batteries (not included)Control Functions:- Program- Skip- Search- Play/Pause- Stop- Mode- On/Off DBBS- Volume control- Headphone jack- Open button- DC 4.5V jackSpecifications:- >20 mW output power- 100 - 20,000 Hz frequency responseUnit Dimensions:- 1 x 5.7 x 5.7-inches (H x W x D)Retail Package Includes:- Classic CM343R Personal MP3 CD Player- Manual- HeadphonesNotes:- Batteries are not included Compatibility/Requirements/Disclosures:** Requirements *** Two (2) AA batteries More ...
|
