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

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

3. 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

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

5. 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

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

7. Photo I.D. & Lab Card ($4 Material Fee)
Get Textbook
Get Photo I.D.
BREAK

8. Chapter #1

9. 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

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

11. Sneakernet
Not a true network
Passed Floppies
No Power
Not Convenient

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

13. 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

14. 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

15. 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

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

17. 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

18. 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

19. 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

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

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

22. 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

23. 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

24. 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

25. 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

26. 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

27. Server Based Networks
LOOK on Page 12 for Advantages and Disadvantages

28. 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

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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

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

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

38. 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

39. Questions
Homework
29 Questions at end of Chapter
Due next class