HB 337 1st Edition Lecture 4 Network A collection of Computers and Network Hardware interconnected by communication channels that allow sharing of resources and information such as printers applications and databases Types of Networks LAN Local Area Network o Interconnects computers within a limited area o Small geographic area o Ethernet and Wifi are two main technologies MAN Metropolitan Area Network o Larger than LAN but smaller than WAN o Can range from several blocks to entire cities WAN Wide Area Network o Covers Broad Area can be local o Used in businesses and government entities to relay data among employees clients buyers and suppliers Network Components 1 Server Lots of memory hard disk space faster CPU that provide shared resources to the network 2 Workstation Personal computer 3 Physical Construction Cable Type Network Topology Network Interface Card Client Server Architecture Peer to peer architecture much smaller gets data provides data simultaneously usually slower These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Workstation vs Node Workstation is a node but not necessarily vice versa Node includes every object within a network Workstation vs Client A workstation is a client b c it receives information A client is everything that receives data Can be a server A server is a node Not a Workstation and not a client Cable Type Twisted Pair Cable Coaxial Cable Fiber Optic most expensive Bandwidth Measured in BPS Bits per Second Network Typology 1 Has to pass through every workstation to get to GNP o Quick Setup and Cheaper o Use Less Cable o Limited of stations per network o If 1 part of cable is down whole network crashes 2 Ring Topology o Major Limitation Needs more cable than bus is more expensive o Open Circuit 1 goes down all go down 3 Star Topology o Most expensive o Easy to Troubleshoot o Sends data to switch first then sends it to destination o Switch Hub allows for a closed circuit o Network goes down when switch goes down Network Components 1 Server Lots of memory hard disk space faster CPU that provided shared resourced to the network 2 Workstation Personal computer Workstation vs Node Workstation vs Client Workstation is a client but client is not necessarily a workstation Security Are people or machine better for security Both are capable of making errors but people are the only ones who can use the other for their personal gain They both also have their advantages Examples of human and computer error o Salespeople copying client list off a USB drive and selling it to their competitors o Employees hacking payroll server and changing wage rate o Servers voiding items on check and collecting the cash Prevention of Hackers Passwords Encryption Biometrics Firewalls