Networking CIS 173 Week #1 & #2 Objectives Course Introduction Chapter #1 Peer-to-Peer Networks Client-Servers Networks

Networking Essentials Spring 1999 16 Weeks 3 Units Wednesdays 7 p.m. - 10 p.m. Room A-208 Santa Ana College

INTRODUCTIONS Sue Sawyer Undergraduate = Education Graduate = MBA Business = 12 Yrs. Sales & Mktg. Military = 12 yrs. U.S.M.C. Captain (Major Select) Officiating Women’s Fast Pitch

INTRODUCTIONS Cont. STUDENTS Name Work/School Background Why are you taking this class? What is your experience/background with computers, if any?

Networking Essentials. THIS COURSE Designed for the Beginner (No pre-req) MCSE Prepatory We don’t test at SAC Troubleshooting Security Networks Peer-to-Peer Server Based Network Design Network Hardware Network Software

TEXTBOOK A Guide to Networking Essentials, by Ed Tittel & David Johnson. Published by Course Technology.

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Chapter #1

The Network Administrator MUST Understand Fundamental Concepts involved in creating a network Making a network work properly & efficiently What’s involved in networked communications Kinds of network models appropriate for various business circumstances

What is Networking Connecting Computers together Sharing Resources & Information Hardware (Device Sharing) Scanners Fax Machines Printers etc... Files & Information GROUPS E-mail Applications

Sneakernet Not a true network Passed Floppies No Power Not Convenient

Network Drawing Draw a simple Network Drawing Tool in MS products Invisio PC PC PC Printer PC

Local & Wide Area Nets LAN WAN MAN Local Area Network Can grow into WAN’s WAN Wide Area Network MAN Metropolitan Area Network Uses WAN tech. To connect LAN’s e.g. Colleges

Ethernet Most popular networking technology in use today Used to be limited to 30 users on single net 607 Feet More than 100 PC’s and more than 1,000 feet NEED for internetwork

Clients, Peers & Servers Share request resources from one another Peer-to-Peer Equal Can be a CLIENT or a PEER Client Computer that accesses shared resources Can be used in: Client/Server & Server Computer that shares its resources across the network Concentrated CPU power & storage capacity

Request-Response Client REQUESTS info. and server RESPONDS to such a request Client/Server Relationship

Network Medium Defines limitations on # & type of devices that can be attached to a LAN Use same Manufacturer where you can Access to a common medium Physical Cable Twisted Pair Coaxial Fiber Optic Wireless Something to carry the signals Network Interface Card (NIC) & it’s “drivers” a.k.a. Network Adapter

Network Protocols Once connected via the NIC & cable the PC MUST be able to communicate with the hardware A common set of rules about how to communicate (software) Agreed-upon rules are called protocols Types of protocols are: TCP/IP, NetBEUI, IPX/SPX, NWLink More on these in Chap. #6

Network Software Network Operating System a.k.a. The CLIENT Network OS or NOS A layer of code that controls which computers and users are permitted to access the network resources Typically include the client and server components Most common today are Windows NT Novell Netware

Network Applications One layer above the NOS Allow the user to do the work

Types of Networks Peer-to-Peer Client/Server a.k.a. “server based

Peer-to-Peer PC can be either a client or a server (pseudoserver) Up to the user of the machine to share or not to share Each user is their own administrator No central control of shares System MUST be turned on No one system has higher priority than any other system

Peer-to-Peer Disadvantages (Pg. 10) Security can be a major concern No networkwide security Workgroups Limited to: Read Only Full Both with or w/o passwords Perhaps different passwords for different resources Not designed to perform well when acting as a server under large workloads Hard to manage file organization Backup is difficult Many machines vs. One Server

Peer-to-Peer Advantages (Pg. 11) Easiest to install Cheapest to install Only Win 95 needed, with NIC, and medium Can use shared resources immediately Loss of one machine only loss of those resources Everyone else can keep working

Server Based Networks Server is a stand ALONE machine Nobody actually uses it (usually) Provide Centralized control of a network Faster CPU Multiple CPU’s More Memory Larger Hard Drives Extra Peripherals Tape Backup CD-ROM Jukebox

Server Based Networks Uses account Names and Passwords Only have to enter it once and have access to all resources in that workgroup or domain Best when over 20 PC’s are being used. A LOT more money The system itself Support Personnel Loss of server is loss of ALL shared resources

Server Based Networks LOOK on Page 12 for Advantages and Disadvantages

Hybrid Networks Win for Workgroups, Win 95, Win 98, Win NT workstation & Win NT Server All can act as a Peer in a Peer-to-Peer All can act as a client on a server based Hybrid is when workstations function as: Peers on a Peer-to-Peer & Clients on a Server Based a.k.a. Combination networks

Server Hardware Requirements Page 13 Table 1-1. Bare Minimum vs. Recommended Big jump to Server

Types of Servers Specialized Roles Don’t need to be running a separate Domain Server to be running a Print Server or Fax Server or Mail Server etc… As your Network grows Server specialization increases Efficiency Costs

Application Server Supply the Server Side of the client/server applications Supply the data to the clients as well Processing Services Handle Requests for File or Print Services Special apps. on client side to do this Does the background processing and delivers back to client the result

Communication Servers Allow employees to Dial In to access the resources via modem on their PC Inbound Comm. RAS (Remote Access Server) Part of NT Server very good And outbound

Domain Controllers/Directory Servers Permits users of a network to…….about a network and available resources Locate Store Secure Information Security by DOMAINS of: Users Groups Resources Allows only one password not many for a “login” service

FAX Servers NT based Fax servers from 3rd parties Manage traffic Fax traffic INTO office TO the recipient Collects OUTgoing Sends Outgoing Requires multiple Modems Phone Lines Be VERY careful when planning phone lines Voice Internet DUN In Out NT based Fax servers from 3rd parties Not Microsoft

File & Print Servers Allow users run applications locally but keep data files on the server. Easier to backup One location not many Many use a reg. Workstation as a pseudoserver. Most Common File Storage File Retrieval Access to network Printers Keeps costs down More expensive to start Just SHARE a LOCAL printer Keep PC on Fewer problems

Mail Servers E-mail Store & Forward Interoffice Internet Waits for users to access them Incoming Outgoing

Web Servers TCP/IP Protocol IIS (Internet Information Server) from NT Server Web FTP GOPHER

Selecting the Right Network Peer-to-Peer 10 or less users Close proximity Budget constraints No special servers are needed Server Based More than 10 users Centralized Control Security Heavy Network Resource Usage Multiple LAN’s in use WAN access required

Questions Homework 29 Questions at end of Chapter Due next class