NETWORK TOPOLOGY NETWORK TOPOLOGY A network topology refers to the layout of the computers and devices in a communications network. PHYSICAL TOPOLOGY The arrangement of a cabling is the physical topology. LOGICAL TOPOLOGY The path that data travels between computers on a network is the logical topology. Types of Network Topologies. STAR TOPOLOGY All the computers and other devices on the network connect to a central device , thus forming a star . Two types of devices that provide a common central connection point to all the other devices on the network are a hub and a switch . The device that provides a common central connection point for other devices on a ne...
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Computer Security
computer security risks Definition of computer security risk: Any event or action that could cause a loss of or damage to computer hardware, software, data, information or processing capability. Malicious code • Malicious code is code causing damage to a computer or system . It is code not easily or solely controlled through the use of anti-virus tools. • Definition : A computer virus is a potentially damaging computer program that affects or infects, a computer negatively by altering the way the computer works without the user’s knowledge or permission. • Examples: Melissa, Tequila, Cascade, Invader • A worm is a program that copies itself repeatedly . • Examples: Jerusalem, Sobig , Nimda , Morris Worm • A program that hides within or looks like a legitimate program . It does not replicate itself to other computers • Examples: Netbus , Back Orifice, Subseven , Beast Unauthorized access & use • To help prev...
INTERNET TECHNOLOGY Definition of internet The Internet is a worldwide collection of networks that links millions of businesses, government agencies, educational institutions, and individuals. Evolution of the internet ARPANET • ARPA – Advance Research Project Agency created by US Department of Defense • The network is called ARPANET • The network became functional in September 1969 The original ARPANET consisted of 4 main computers located at: q University of California at Los Angeles q University of California at Santa Barbara q The Stanford Research Institute q University of Utah q Each computers served as a host on the network (today known as server) INTERNET2 • Internet2 is not a new network (especially to replace the Internet) • It is a Research and Development (R&D) project • In developing technology to ensure tha...

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