Network Basic

A network or communication network is a system of interconnected communication devices that can communicate with one another and share information. Therefore computer network can be defined as

A system in which more than one computers or large number of computers are interconnected together, communicate freely with one another and share information is called computer network.

A network can be internal to an organization or span the world by connecting itself to the internet. In computer network, network operating system is used that controls and co-ordinates the activities of computers that are connected to the network. The example of these operating systems are: windows NT, UNIX, and Novell etc.

Types of Network

Networks are of three types. These are:
* Local Area Network (LAN)
* Wide Area Network (WAN)
* Metropolitan Area Network (MAN)

Local Area Network

A local area network is a network system in which computers are interconnected in a limited geographical area, such as network of computers in college computer laboratory or network of computers in office building etc.

Wide Area Network

A wide area network is a network system that covers a large geographical area such as different cities of country or different countries of the world. In WAN telephone lines, satellites, microwave, fiber optic etc. are used as transmission media.

Metropolitan Area Network

A Metropolitan area Network is a network system that covers area of a single city. Usually, MAN connects more than one LANS in a city or town and covers a smaller geographical area than a WAN. The cable television, telephone companies or local corporations use MAN.

Network Basics

A network is a group of computers, printers, and other devices that are connected together with cables. Information travels over the cables, allowing network users to exchange documents & data with each other, print to the same printers, and generally share any hardware or software that is connected to the network

Each computer, printer, or other peripheral device that is connected to the network is called a node. Networks can have tens, thousands, or even millions of nodes.

Like most things, networks are are assembled according to certain rules. Cabling, for example, has to be a certain length, each cabling strand can only support a certain amount of network traffic etc, Nodes are essential components of any computer networks. In general, these components are essential in transmitting, receiving, and forwarding messages. Nodes can also be computers, mobile phone, personal digital assistants (PDAs), routers, switches, and any device that is connected to a computer networks.

The rules that govern how a network is set up is called its topology. The most popular topology in use today is called Ethernet, which consists of computers and peripherals cabled together in specific ways. Ethernet is relatively inexpensive, easy to set up and use, and very, very fast.

Ethernet networks are categorized by how fast they can move information. Speed is expressed in megabits per second (or Mbps), where one “bit” is equal to 1/8th of a character, letter, or number.

There are currently two Ethernet speed categories. Standard Ethernet operates at a fast 10Mbps, which is quick enough for most networking tasks. Fast Ethernet, by contrast, races along at a blistering 100Mbps, making it ideal for desktop video, multimedia, and other speed-hungry applications. The new technology behind Fast Ethernet, which was introduced in the beginning of 1995, is not readily compatible with standard Ethernet.

Making the two “talk” with each other requires special equipment and some knowledge of internetworking. If you’re building your first network, decide whether to go with standard or Fast Ethernet before you begin shopping around for network hardware and software. Unless you plan on using video, multimedia, or heavy graphics software, plan on using standard Ethernet.

Computer Networking Useful Tips

How to Setup Workgroup and Computer Name in Windows XP

Computer name is the unique identifier of the computer in the network. If you want to setup the computer name and the workgroup in the Windows XP then follow these steps.

1. My Computer>Right Click>click on Properties>
2. Assign unique computer name.
3. Assign the same workgroup name as of the other computers.
4. You will be prompted to restart the computer.

How to secure your computer network

Securing a computer networking is the vital part of the administration of the network. There are different security threats of a computer network such as hacking, viruses, unauthorized user access, spywares, adware, Trojan horses and other malicious codes. If you are managing your computer network, it’s your responsibility to secure your network from all above mentioned aspects. Always install up to dated antivirus program such as Norton Antivirus, Trend Micro Antivirus, McAfee or Panda Antivirus. Enable firewall router or firewall software on your network to control the unauthorized access so that no intruder or hacker can access your network.
Filter the internet and monitor all the activities of the users on the internet. Block the risky websites and web applications. Install a network monitoring software and monitor the activities of users. Regularly update your software applications on the server and the client computers.

How to Share Printer and Folders in Windows XP

If you have two or more computers then a computer network will be formed and there will be necessity to share the files and printers. For sharing the folders, you need to right click the folder > Sharing and Security > Share this folder on the network > give the shared name for this folder. You can set further rights and permissions on this folder for different users.

Sharing a printer is the same as sharing a folder on the network. Click start > Control Panel > Printer and Faxes > Right click on the printer name > Properties > sharing > Share this folder (set the shared name for the printer. This same shared name of the printer will be accesses from the other computers on the network to access and share the printer such as \\computename\printername

How to troubleshoot computer network using Ping command

The PING command is the basic network troubleshooting command. Ping shows the status of the other computer whether it is on the network or not. Let’s say you have three computers in your computer network computer A (IP Address, 10.10.10.1), computer B (IP address 10.10.10.2) and computer C (IP address 10.10.10.3). You are on computer A and you want to check the connectivity of the computer B then you will need to go the Start > Run > type CMD > DOS screen will appear. Now type there ping 10.10.10.2 if you get the reply this means the computer B is connected on the network and if you get the timed out message then there is some problem in the connectivity. This can be due to different reasons like check both the ends of the network cables in the computer and in the Router/Switch, check if the green LED light is blinking in the network card of the computer also check if any softwa
re application blocking the network communication such as firewall or antivirus etc.

How to setup Xbox Network Connections

Following is the simple configuration methods of Xbox network connectivity.

1. Go to the settings of Xbox Dashboard and then network settings. You will see IP address, DNS and some othersettings.
2. Click IP settings. You can select to obtain the IP address and other settings automatically from the DHCP server or router.
3. Go to the previous menu and set obtain the DNS settings from the Router or DHCP server automatically.

How to Setup Roaming Profile in Windows 2000/2003

Roaming profiles are saved on the network server. If you want your users to access their own roaming profiles then you need to open Active directory users and computers, right click on the user, then properties and then profile tab. In the profile tab type the UNC path of the user you made on the server like this \\servername\profiles\%username%. Profiles folder should be in the root of the C Drive. Make sure you have created the profiles folder on the C drive and shared it with the same name as the name of the folder. Next time when the user will log on from the client computer, his/her local profile will be saved in the folder same as the user name and this folder will be created in the profiles folder.

How to Install IIS in Windows XP

Windows XP Professional edition has the built-in IIS. Internet information server is used to host the website on your own computer and these sites can be accesses from all over the world. IIS has great administrative features but it supports only 10 concurrent connections of the clients at a time.

1. Click start>settings>control panel>Add remove program
2. Click Add remove windows components.
3. Click on Internet information services > Details.
4. In the IIS check the boxes SMTP and World Wide Web and you can also check FTP if you want to setup it.
5. In Windows components selection, make sure that you have selected IIS and you may need to insert the CD of Windows XP Professional during the installation.

How to Setup Roaming Profiles in Windows 2000

The TCP/IP component in the Windows operating systems is considered a core component so it cannot be easily uninstalled. Using the following commands with the certain switch you can however achieve the same results and by uninstalling and reinstalling the TCP/IP components.

netsh int ip reset [logfile]

Logfile is the name of the file that is used to records the actions by the netsh command.

netsh int ip reset iplog.txt is used to create the iplog.txt in the current directory.

Caution: Be very careful while using these commands because they can directly damage your system.

How to Hide a shared folder in Windows XP

If you want to hide a shared folder from the network users, right click the folder and click sharing and security and give a shared name of a folder plus $ sign e.g. ebooks$. In this way network users will not be able to see the shared folder on the network. For you to see the hidden shared folder, map the drive and type in the path including