I) IDENTIFY THE DIFFERENT TYPES OF VIRUSES THAT CAN AFFECT A LAN COMPUTER NETWORK.

I) Different types of viruses that can affect a LAN computer network include:

1. File Infectors: These viruses attach themselves to executable files and can spread to other files on the network.
2. Boot Sector Viruses: These viruses infect the boot sector of a computer's hard drive or floppy disk, making it difficult to start up the computer.
3. Macro Viruses: These viruses infect documents and spreadsheets that contain macros, potentially spreading to other documents on the network.
4. Network Viruses: These viruses spread through network connections and can quickly infect multiple computers on the LAN.

II) Symptoms of a computer network affected by a virus may include:

1. Slow performance and frequent crashes.
2. Unexplained changes to files or programs.
3. Pop-up messages or unusual behavior from software.
4. Difficulty accessing network resources.
5. Increased network traffic or bandwidth usage.

III) Methods of preventing, detecting, and eradicating viruses on a LAN computer network include:

1. Install and regularly update antivirus software on all computers connected to the LAN.
2. Implement strong network security measures such as firewalls and secure passwords.
3. Educate users about safe practices, such as avoiding suspicious links or downloads.
4. Regularly backup important files and data to prevent loss in case of a virus infection.
5. Use email filtering tools to prevent the spread of viruses through email attachments.
6. Perform regular scans and updates to detect and remove any viruses on the network.
7. Isolate infected computers to prevent the spread of the virus to other computers on the LAN.