Purpose of class • Explore components of local area networks • Look at the use and benefits of networks • Learn about network hardware, software, topologies, and terminology • Identify technical and non-technical skills that will help you succeed as a network professional
What is a Network? • A group of computers and other devices that are joined together.
Share data Share resources Share software Centralize storage Centralize backup Strengthen security Enhance communications Why Networks?
Do you need a network? • You are a self employed consultant with a computer, a printer and a fax. • Do you need a network? • You work for a small graphics firm. All the computers have large hard disks as well as zip drives. You only have one color laser printer. • Do you need a network? Would one be helpful? • Because several people do not backup regularly, your company has lost some critical data and has spent thousands of dollar reconstructing the data. • Do you need a network? Would one be helpful?
Roles of Computers in a Network • Client • uses network resources but doesn’t provide any resources to the network • Peer • uses and provides network resources • Server • provides network resources
Basic Network Types • Peer-to-peer • Server-based (client-server)
Peer-to-Peer Networks • Simplest type of network • Inexpensive and relatively simple to set up and maintain • No dedicated server • All computers are equal • Each computer functions both as a client and as a server • Often called workgroups • Each user acts as an administrator for their own computer—no centralized administration of users or resources
Peer-to-Peer Networks • Can use Windows NT Workstation, Windows 98/ME, Windows 2000/XP Professional, or built-in network operating system (MACs) • Appropriate for small offices and homes • typically 10 users or less • no security issues • limited growth
Server-Based Network • One or more dedicated servers provide network resources • File and print server • Mail/Message server • Application server • Provide centralized storage • Divide processing tasks between clients and servers (client/server)
Server-Based Network • Can support a larger number of users • Centralized management • Often require an administrator(s) • Require network operating system (NOS) such as Windows NT Server, Windows 2000 Advanced Server or Novell Netware
Server-Based Network • Generally server-based networks provide higher security than peer-to-peer networks • User accounts and passwords • Access to resources can be control by individual user or groups • Rights and permissions
Server Hardware • Usually servers are high powered computers • Large hard disks • Fast processors • Multiple processors • Large amount of RAM
Which type of network would you recommend? • A collections agency with 5 computers wants an inexpensive network that enables users to share a printer and files. The agency is not expecting any increase in the number of employees. Peer-to-peer or server-based?
Which type of network would you recommend? • A travel agency currently has 8 employees. They are expecting to hire 3-4 employees in the next year. They want to be able to share files, a laser printer and a color inkjet printer and send e-mail. It is important that data be backed up regularly. Peer-to-peer or server-based
Network Topology • Physical layout of the computers and other devices in a network.
Four standard network topologies • Bus • Star Hub Ring Hybrid
Network Protocols • A protocol is a set of rules or standards the enable computer to exchange information. • All computers in a network must have at least one set of protocols in common in order to communicate • TCP/IP (Transmission Control Protocol/Internet Protocol) is the protocol used to communicate using the Internet • There are protocols for hardware and software
Copper Coaxial cable Twisted-pair cable Glass Fiber-optic cable Wireless (Air) Infrared Radio waves Microwaves Network Transmission Media • Anything that carries the message through the network
Destination ID Control CRC Sender ID Data Data Packet and Addressing • Data packets--Small chunks of data and other information transmitted from one computer to another on the network • Addressing—scheme used to uniquely identify every workstation and device on the network
Network Services • File and Print services • Provide centralized storage of data • Allow printers to be placed in centralized locations • Communication services • Allow remote users to connect to the network • Mail services • Manage electronic messages between network users
Network Services • Internet services • Manage access to the Internet; security • Management services • Provides for central administration and management of network resources • Monitor traffic • Deploy software • Alert administrator of network problems
Technical Skills • Install, configure, and troubleshoot client operating systems • Install, configure, and troubleshoot network operating systems • Be familiar with network topologies, media, components, and protocols • Understand account policies, user accounts, groups, user rights, and permissions
Important Soft Skills • Customer Service • Communications • Strong Work Ethic • Teamwork • Leadership