Lecture 4Network – A collection of Computers and Network Hardware interconnected by communication channels that allow sharing of resources and information such as printers, applications, and databasesTypes of NetworksLAN – Local Area NetworkInterconnects computers within a limited areaSmall geographic areaEthernet and Wifi are two main technologiesMAN – Metropolitan Area NetworkLarger than LAN but smaller than WANCan range from several blocks to entire citiesWAN – Wide Area NetworkCovers Broad Area – can be local,Used in businesses and government entities to relay data among employees, clients, buyers, and suppliers.Network Components1. Server – Lots of memory, hard disk space, faster CPU that provide shared resources to the network2. Workstation – Personal computer3. Physical Construction – Cable Type, Network Topology, Network Interface CardClient/Server Architecture - Peer to peer architecture (much smaller) – gets data + provides data simultaneously, usually slowerWorkstation vs. NodeWorkstation is a node but not necessarily vice versaNode includes every object within a networkWorkstation vs. ClientA workstation is a client b/c it receives informationA client is everything that receives data.Can be a serverA server is a nodeNot a Workstation and not a clientCable TypeTwisted Pair CableCoaxial CableFiber-Optic (most expensive)Bandwidth - Measured in BPS (Bits per Second)Network Typology1) Has to pass through every workstation to get to GNP.Quick Setup and CheaperUse Less CableLimited # of stations per networkIf 1 part of cable is down, whole network crashes2) Ring TopologyMajor Limitation – Needs more cable than bus + is more expensive.Open Circuit (1 goes down all go down)3) Star TopologyMost expensiveEasy to TroubleshootSends data to switch first then sends it to destinationSwitch/Hub allows for a closed circuitNetwork goes down when switch goes downNetwork Components1. Server – Lots of memory, hard disk space, faster CPU that provided shared resourced to the network2. Workstation – Personal computer, Workstation vs. Node, Workstation vs. Client – Workstation is a client, but client is not necessarily a workstation.SecurityAre 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:Salespeople copying client list off a USB drive and selling it to their competitors.Employees hacking payroll server and changing wage rate.Servers voiding items on check and collecting the cash.Prevention of Hackers:PasswordsEncryptionBiometricsFirewallsHB 337 1st EditionLecture 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 areao Small geographic area o Ethernet and Wifi are two main technologies - MAN – Metropolitan Area Networko Larger than LAN but smaller than WANo Can range from several blocks to entire cities - WAN – Wide Area Networko 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 Cheapero Use Less Cable o Limited # of stations per networko 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 Troubleshooto Sends data to switch first then sends it to destinationo 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-