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Types Of Networks

Types Of Networks

1. Peer- to-Peer network

In this network no computer set-aside as a server but all computers operator as equals.Each computer is called peer.Each computer can acts as a client or server.Each computer is responsible for its own security.It is small networks having number of computers less than 10

Advantages 

The network is easy to operate.

The resorce sharing is simple.

It is cost effective for small network.

Disadvantages 

It is not useful for database application.

It cannot maintain security.

It cannot be used for large networks.

2. Server-Based network

In this network one computer is set-aside as a server and remaining all computer acts as client.The server processes all the request made by the client.server is high performance system.It has faster CPU and more disk space amd memory size.The server is operateb by network.Operating system

Advantages 

The network is more secure..

It is used in large network.

It is useful for database application..

Disadvantages 

It is difficult to install the network.

It is not cost effective as cost of server is large then the client.

Computer Viruses

                                          A computer virus is a computer program that can infect your computer system by executing itself without your permission or knowledge and run against your wishes. Viruses can also replicate itself to maximum the infection.   

                                         Viruses can infect the normal functioning of the computer in many ways. some viruses may display only a message on the screen whereas other may slow –down your pc or may cause extensive damage to your system  . for an instant, they may change computer files so that programs do not work properly or even stop working. They can also erase files or even format your hard disk and crash the system.

                                         viruses are also easily spread by carrying it on a removable medium such as floppy disk, USB drive or cd. Computer viruses are most easily spread by attachment in e-mail messages or by instant messaging or by instant messaging message.

The following are some primary indicators that a computer may be infected

1. The computer runs slower than usual.

2.the computer stops responding, or it.

4. The computer crashes, and then it restarts every few minutes.

5. The computer restarts on its own. Additionally, The computer does not run as usual.3.

6. Application on the computer does not work correctly.

7. Disks or disk drives are inaccessible.

8. You see unusual error messages.

9. An antivirus program is disabled for no reason. Additionally, the antivirus program cannot be restarted.

10. An antivirus program cannot be installed on the computer, or the antivirus program will nor run.

11. A program disappears from the computer even though you did not intentionally remove the program.

 

Antivirus Software:-Is a computer program that detects, prevents, and task action to disarm or remove malicious software program, such as viruses and worms .you can help protect your computer against viruses by using antivirus software, Such as Norton Antivirus, Avast antivirus, McFee, Kaspersky,e, Bitdefender Antivirus, F-Secure Antivirus

To protect a computer against Viruses follow these steps,

  • On the computer, turn on the firewall.
  • Keep the computer operating system up-to-date.
  • Use updated antivirus software on the computer.
  • Use updated antispyware software on the computer

Maintaining The Computer

                                    Microsoft has created a pair of built-in automated troubleshooting packs to optimize and maintain performance. window 7,8,8.1,10  window 7,8,10 handles lots of lots of files. So, you need to organize files in logical ways and perform maintenance activities from time to time. Windows provides three tools to help manage the files and folder stored on hard disks 

Disk cleanup help to get rid of old files on your hard disk. The window looks through your hard disk for types of files that can be deleted and list them. You can then select the type of files you want to delete.

Follow Step-By-Step

  1. Click on My computer.Then select on C: Drive.
  2. Right-click on c drive then select on properties.This will display the disk properties window on your screen. 
DISK CLEAN-UP

3. Click on disk cleanup button.windows will calculate how much space you could save.

Disk cleanup

4.Select the type of files to delete, and click ok

5. You are asked if you want to permanently delete these files. Click delete files to permanently delete them.

6. When you are ready, close the properties dialog box.