Computer Networks

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computer networks

Computer Networking Fundamentals

The sharing of fax machines, printers, and modems amongst many computers and users reduce the operational cost. A database on a computer network is a very important application as it stores and runs many important data and jobs. Emails and chats can be used for instantaneous communication and sending of files on a computer network.

The computer networks are classified, depending upon the size, as Local Area Networks (LAN), Wide Area Networks (WAN), Metropolitan Area Networks (MAN) and Personal Area Networks (PAN). The topology (topology is the way the computer networks and network resources are connected) of the networking can be classified as Bus Network, Ring Network and Star Network.

The networking hardware basically consists of wiring, network cards and a hub. Computer network cards are required so that one computer can understand what the other computer is “talking”. Network cards have a unique MAC address to identify computers on a computer network. Hubs connect all the computers in the network. Hubs can also be used to connect to other hubs to increase the size of the computer network. Two computers can be connected using Ethernet cards or phone lines or power lines for communication, with hardware kits available at roughly a cost of $100.

As the number of computers in an office or a home increases, so do the number of cables, so wireless networking is a viable solution. In wireless networking radio transreceivers or infrared signals are used to communicate between computers and devices. Examples of wireless networking include Wi-fi and Bluetooth technology, though there may be security issues involved in wireless networking. However there definitely is a stronger preference towards wireless networking nowadays among consumers.

Computer networks have added a new dimension to the 21st century. Today the cyber world is much faster and wider than the real world. This has all been made possible due to computer networks. Computer networks have revolutionized business, communication, travel, research, defense, society and almost all human endeavors. The evolution of computer networks has helped the technological revolution take a big leap forward.

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Computer Networks


 'a' Level Question and Answer Basics of Os Unix and Shell Programming and Data Communications and Computer Networks: According to Doeacc 'a' Level Syllabus


‘a’ Level Question and Answer Basics of Os Unix and Shell Programming and Data Communications and Computer Networks: According to Doeacc ‘a’ Level Syllabus


$10.3


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 00951 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Grey (6-Inches)


00951 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Grey (6-Inches)


$12.53


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. The molded, snagless boot prevents unwanted cable snags during installation and provides extra strain relief. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00952 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Blue (6-inches)


00952 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Blue (6-inches)


$12.49


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. The molded, snagless boot prevents unwanted cable snags during installation and provides extra strain relief. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00957 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Orange (6-inches)


00957 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Orange (6-inches)


$12.49


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. The molded, snagless boot prevents unwanted cable snags during installation and provides extra strain relief. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00958 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Purple (6-inches)


00958 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Purple (6-inches)


$20.7


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. The molded, snagless boot prevents unwanted cable snags during installation and provides extra strain relief. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00960 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Pink (6-inches)


00960 Cat6 Snagless Unshielded (UTP) Network Patch Cable, Pink (6-inches)


$12.49


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. The molded, snagless boot prevents unwanted cable snags during installation and provides extra strain relief. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00961 Cat6 Non-Booted Unshielded (UTP) Network Patch Cable, Grey (6-Inches)


00961 Cat6 Non-Booted Unshielded (UTP) Network Patch Cable, Grey (6-Inches)


$12.49


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 00967 Cat6 Non-Booted Unshielded (UTP) Network Patch Cable, Orange (6-Inches)


00967 Cat6 Non-Booted Unshielded (UTP) Network Patch Cable, Orange (6-Inches)


$12.49


For fast Ethernet and Gigabit computer networks that require bandwidth-intensive voice, data, or video distribution applications. Meets all Cat6 TIA/EIA standards, and drastically reduces both impedance and structural return loss (SRL). Each of the individual pairs is bonded together to help maintain the twist-spacing throughout the line right up to the termination point. Constructed from high quality copper cable, this design minimizes Near-End Crosstalk (NEXT) levels. Available in a variety of colors to easily color-code your network installation. Connector 1: (1) RJ-45 Male Connector 2: (1) RJ-45 Male

 1 Zone, 1 Way 8 IP Zones


1 Zone, 1 Way 8 IP Zones


$381.28


Description:? Valcom Pagepro Sip Based Paging Server- Easy To Install- Live Or Recorded Messages- 65,000 Speakers, Expandable Up To 256 Ip Paging Zones- Easily Connect Loudspeaker System To Existing Computer Networks- Compatible With Cisco, Nortel, Avaya, Iwatsu And Most Ip Telephone Systems- Supports Ip And Analog Amplified Speakers- Supports Ip Talkback Speakers- Supports Legacy Paging Systems- Synchronized Clock Compatibility- Poe (802.3Af) Or Local Power- Sip And Multicast- Network Supervision- Feedback Eliminator- Night Ring- DhcpVcvip201

 1 Zone, 1 Way 8 Ip Zones


1 Zone, 1 Way 8 Ip Zones


$464.17


Valcom PagePro SIP based paging server- Easy to install- Live or recorded messages- 65,000 Speakers, expandable up to 256 IP paging zones- Easily connect loudspeaker system to existing computer networks- Compatible with Cisco, Nortel, Avaya, Iwatsu and most IP telephone systems- Supports IP and analog amplified speakers- Supports IP talkback speakers- Supports legacy paging systems- Synchronized clock compatibility- PoE (802.3af) or local power- SIP and Multicast- Network supervision- Feedback eliminator- Night ring- DHCPVCVIP201

 10 Cat5 RJ45 Ethernet Computer Networking Cable


10 Cat5 RJ45 Ethernet Computer Networking Cable


$3.39


This high quality Cat5 Ethernet Cable is designed for use on Ethernet / RJ45 networks. It will work at 10BaseT or 100BaseT speeds (10Mbps, 100Mbps)

 10 FOOT - 3 Pack / Category 5e (CAT 5e) RJ45 Snagless Molded Patch Cable (BLUE)


10 FOOT – 3 Pack / Category 5e (CAT 5e) RJ45 Snagless Molded Patch Cable (BLUE)


$31.94


Category 5 enhanced (Cat5e) is design for today’s Ethernet and gigabit computer networks. These cables will distribute data, voice, video, and handle other bandwidth intensive applications for up to 100MHz. The molded, snag-free boot prevents unwanted cable snags during installation and provides extra strain-relief. Patch cables are available in a variety of colors to easily color-code your network installation. The specification for Category 5e cable was defined in ANSI/TIA/EIA-568-A, with clarification in TSB-95. These documents specified performance characteristics and test requirements for frequencies of up to 100 MHz. Cable types, connector types and cabling topologies are defined by TIA/EIA-568-B. The cable is terminated in either the T568A scheme or the T568B scheme. Canada and Australia use the T568A standard, and the United States commonly uses T568B scheme. The two schemes work equally well and may be mixed in an installation so long as the same scheme is used on both ends of each cable. Nearly always, 8P8C modular connectors, often incorrectly referred to as ‘RJ-45′, are used for connecting category 5e cable. Each of the four pairs in a Cat 5e cable has differing precise number of twists per meter based on prime numbers to minimize crosstalk between the pairs. On average there are 6 twists per 5 centimeters. The pairs are made from 24 gauge (AWG) copper wires within the cables. Although, cable assemblies containing 4 pairs are common, Category 5e is not limited to 4 pairs. Backbone applications involve using up to 100 pairs. This use of balanced lines helps preserve a high signal-to-noise ratio despite interference from both external sources and crosstalk from other pairs. Category 5e cabling is most commonly used for faster Ethernet networks, such as 100BASE-TX and 1000BASE-T.

 10 ft Cat 5E (Crossover) Network Cable (UTP)


10 ft Cat 5E (Crossover) Network Cable (UTP)


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Today’s fast Ethernet computer networks require Category 5e Enhanced 350 Mhz cables to distribute data, voice, and video. This blue cable comes is 10-foot in length and works with 10BaseT and 100BaseT environments. Suitable for Gigabit Ethernets! Order today!

 10 ft Ethernet CAT5E CAT5 5 E Patch LAN Network RJ45 Male Blue Cable Cord


10 ft Ethernet CAT5E CAT5 5 E Patch LAN Network RJ45 Male Blue Cable Cord


$4.95


Thanks to the innovative design of our CAT5e Crossover Patch Cable, it’s easy to connect computers on your Local Area Network (LAN). This premium cable is designed to connect hub-to-hub, PC-to-PC, or Mac-to-Mac computer. Molded-strain relief provides extra security, and 50-micron, gold-plated connectors ensure clean, clear transmissionsCategory 5e UTP Patch Leads are manufactured, tested and independently verified to the ISO11801 Category 5 1999 and EIA/TIA 568 Addendum 11 draft standards for enhanced performance. Each cable consists of 8 colour coded stranded 24AWG conductors twisted together to form 4 pairs with varying lay lengths. The soft PVC outer sheath, coupled with the stranded conductors, results in a highly flexible cable. With an excellent build quality, these Ethernet network patch cables have moulded hoods to offer improved stability and reliability. Fully verified for the usual 10/100 Ethernet use AND Gigabit Ethernet, they are ideal for all-round usage from a single patch cable in a home network environment to corporate network patch-bays. Cable features 50 micron gold plated RJ45 (male-to-male) connectors which ensure clear transmission. This 10 feet, 3 meter, FastCAT (Tm) 5e Patch cable works excellently with 10, 100 and 1000 Base-T networks.

 10 ft Ethernet CAT5E CAT5 5 E Patch LAN Network RJ45 Male Blue Cable Cord


10 ft Ethernet CAT5E CAT5 5 E Patch LAN Network RJ45 Male Blue Cable Cord


$4.9


Thanks to the innovative design of our CAT5e Crossover Patch Cable, it’s easy to connect computers on your Local Area Network (LAN). This premium cable is designed to connect hub-to-hub, PC-to-PC, or Mac-to-Mac computer. Molded-strain relief provides extra security, and 50-micron, gold-plated connectors ensure clean, clear transmissionsCategory 5e UTP Patch Leads are manufactured, tested and independently verified to the ISO11801 Category 5 1999 and EIA/TIA 568 Addendum 11 draft standards for enhanced performance. Each cable consists of 8 colour coded stranded 24AWG conductors twisted together to form 4 pairs with varying lay lengths. The soft PVC outer sheath, coupled with the stranded conductors, results in a highly flexible cable. With an excellent build quality, these Ethernet network patch cables have moulded hoods to offer improved stability and reliability. Fully verified for the usual 10/100 Ethernet use AND Gigabit Ethernet, they are ideal for all-round usage from a single patch cable in a home network environment to corporate network patch-bays. Cable features 50 micron gold plated RJ45 (male-to-male) connectors which ensure clear transmission. This 10 feet, 3 meter, FastCAT (Tm) 5e Patch cable works excellently with 10, 100 and 1000 Base-T networks.

 10' Cat7 Shielded Network Ethernet Cable


10′ Cat7 Shielded Network Ethernet Cable


$8.95


Fosmon Cat7 Network Ethernet Shielded Cables are designed specifically to meet Ethernet cables standard and interconnect technologies. Cat7 (Class F) cables are backward compatible with Cat5 (Class D) and Cat6 (Class E) cables. With the shielding added to the cables, it acts as Faraday cage reducing electrical noises that affects the signal of transmission. The shielding also reduces the electromagnetic interferences that may affect your devices connection. Cat7 cables allow the transmission frequency of up to 600 MHz for fast and reliable data transmitting speed for your home and office networks. The cable s RJ-45 connectors allow you to connect to any computer or network components such as DSL/cable modems, routers, switch boxes, network printers, network attached storage devices and other network applications. Surf the net, stream video, music and other data at greater speed with Fosmon Cat7 Shielded Network Ethernet cable. Length: 10ft/3.05m

 10' FT RJ45 CAT5 CAT5E LAN Network Ethernet Patch Cable


10′ FT RJ45 CAT5 CAT5E LAN Network Ethernet Patch Cable


$3.98


100% new high quality Original Ethernet Cable, CAT 5E(Enhancement) This cable connects all the hardware destinations on a Local Area Network (LAN). Ideal for use with 10 Base-T, and 100 Base-T networks. This CAT-5e patch cable has two RJ-45 male to male connectors and features 50-micron gold plated connectors which ensure a clean and clear transmission. Color: Blue Gold plated connectors Length: 10 feet /3M Compliance Standards: EIA/TIA-568B Category 5E Type: Patch cable Connector(s): 1 x RJ-45 – male Connector(s) (Other Side): 1 x RJ-45 – male works best for your desktop, laptop, router, modem, switch, hub, DSL, xBox, PS2, PS3, …

 1001 Computer Words


1001 Computer Words


$27.47


1001 Computer Words You Need to Know explains and illuminates the essential vocabulary of computers and the Internet. This comprehensive, but never condescending guide to the language of the electronic age carefully defines and explains every term with a sample sentence, and many entries have supplementary notes. In addition, the book includes a number of quick miniguides to managing your online life – dealing with Windows and Macs (and sometimes *nix), burning CDs and downloading files, word processing, spread-sheeting, connecting to the Internet (dialup, cable, DSL, wireless) surfing, IMing and emailing, taking digital photos, coping with networks, memory, and drives, and just plain coping with your computer. The backmatter contains an extensive list of helpful websites and an essay about online language and etiquette.

 1001 Computer Words You Need to Know


1001 Computer Words You Need to Know


$1.99


1001 Computer Words You Need to Know explains and illuminates the essential vocabulary of computers and the Internet. This comprehensive, but never condescending guide to the language of the electronic age carefully defines and explains every term with a sample sentence, and many entries have supplementary notes. In addition, the book includes a number of quick miniguides to managing your online life – dealing with Windows and Macs (and sometimes *nix), burning CDs and downloading files, word processing, spread-sheeting, connecting to the Internet (dialup, cable, DSL, wireless) surfing, IMing and emailing, taking digital photos, coping with networks, memory, and drives, and just plain coping with your computer. The backmatter contains an extensive list of helpful websites and an essay about online language and etiquette.

 100M 2.4GHz USB 2.0 Bluetooth Adapter Dongle KH-A08


100M 2.4GHz USB 2.0 Bluetooth Adapter Dongle KH-A08


$3.69


Add bluetooth compatibility to your USB devices with this adapter. Link your bluetooth-enabled cellphone or PDA with your computer or wirelessly connect your MP3 player to your bluetooth-enabled computer. You will love it.Put an end to the clutter of cables with this best bluetooth adapter. Low-profile design stays connected to your laptop for quick and easy Bluetooth connections. Works with most devices enabled with Bluetooth technology. Stays connected to your laptop for quick and easy Bluetooth connections. With Bluetooth USB Adapter with chip 1.2 Asc3600 KH-A08, you can transfer files, synchronize your PDA and smart phone contacts and calendar with Microsoft Outlook, use your phone as a wireless modem to connect to the Internet or networks, connect multiple devices (mice, keyboard, keypad) wirelessly to your PC, print from your phone or PC to a Bluetooth printer, fax from your PC through your smart phone, and much more. The bluetooth adapter is so convenient; why not choose it now?
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