The Difference Between a Computer Virus, Worm and Trojan Horse

• Virus: A program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes.
• Trojan horse: A destructive program that masquerades as a benign application. Unlike viruses, Trojan horses do not replicate themselves
• Worm: A program or algorithm that replicates itself over a computer network and usually performs malicious actions
• Blended threat: Blended threats combine the characteristics of viruses, worms, Trojan Horses, and malicious code with server and Internet vulnerabilities .
• Antivirus program: A utility that searches a hard disk for viruses and removes any that are found.   
  
  Tips to Combat Viruses, Worms and Trojan Horses on Your Computer
  
  
  Keep The Operating System Updated
  
  
  The first step in protecting your computer from any malicious there is to ensure that your operating systems (OS) is up-to-date. This is essential if you are running a Microsoft Windows OS. Secondly, you need to have antivirus software installed on your system and ensure you download updates frequently to ensure your software has the latest fixes for new viruses, worms, and Trojan horses. Additionally, you want to make sure your anti-virus program has the capability to scan e-mail and files as they are downloaded from the Internet, and you also need to run full disk scans periodically. This will help prevent malicious programs from even reaching your computer.
  
  
  
  
  
  
  

 

Networking Hardware?

Did you know what it is? this is another entry that i want to share who do not know or who already know about it...

 

there are several parts of the network hardware that we should know:

• file server
• workstations
• network internet cards
• switches
• repeaters
• bridges
• routers 
• firewall
  
  Servers
  
  One or more network servers is a part of nearly every local area network.These are very fast computers with a large amount of RAM and storage space, along with a one or more fast network interface card(s). The network operating system provides tools to share server resources and information with network users. A sophisticated permissions-handling system is included, so that access to sensitive information can be carefully tailored to the needs of the users. For small networks, a singe network server may provide access control, file sharing, printer sharing, email, database, and other services
  
  Workstations
  
  Computers that humans use are broadly categorized as workstations. A typical workstation is a computer that is configured with a network interface card, networking software, and the appropriate cables. Workstations do not necessarily need large storage hard drives, because files can be saved on the file server. Almost any computer can serve as a network workstation.
  
  
  
  Network Interface Cards
  

  
  

  Often abbreviated as NIC, an expansion board you insert into a computer so the computer can be connected to a network. Most NICs are designed for a particular type of network, protocol, and media, although some can serve multiple networks.   

  
  

  

   

  A Wi-Fi network card with an external aerial for the signal

  
  

  Switches
  
  A network cable can only have one data packet in it at any instant.
  So if two or more computers want to place a data packet on to the network at exactly the same time, then a 'data collision' will take place. 
  The network protocol is set up to deal with this. Basically it declares the collided data as unusable and forces the two computers to re-send their data packets at a slightly different time.
  

  

  
   Repeaters
  
  

  All signals fade as they travel from one place to another. 

  
  

  

  
  

  Each type of network cable has a maximum useable length. If you go beyond that length, the signal will be too weak to be useful.
  Of course, computers on a real network can easily be more than 200 metres apart. Therefore the network cable is split up into segments. Each segment is less than the maximum length allowed. Joining the segments together is a device known as a 'Repeater'.
  

  
  

  A Repeater boosts the signal back to its correct level.
  Here are some typical maximum cable lengths:
  

  • Copper cable - 100m
  • Thick Ethernet - 500m
  • Thin Ethernet - 185m

  
  
  Bridges
  

  A Bridge does just what you would expect it to do - it joins two networks together so as far as data packets are concerned it looks like one large network
  A bridge is not as capable as a Router - but it is less expensive.
  Both networks have to be using the same protocol
  
  

  

  
  

  Routers
  
  A Router is a device that transfers data from one network to another in an intelligent way. It has the task of forwarding data packets to their destination by the most efficient route.
  

  When a data packet arrives, the router does the following:-

  - Reads the data packet's destination address

  - Looks up all the paths it has available to get to that address

  - Checks on how busy each path is at the moment

  - Sends the packet along the least congested (fastest) path

  
  

  

  Other tasks the Router can perform:

  - Exchange protocol information across networks

  - Filter traffic - helps prevent unathorised intrusion by malware