000-Basic Concepts(2)

8/7/2019 000-Basic Concepts(2)

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1/25/11 (c) Edward Bigos 2011

Client/Server Concepts

Basic Tasks

Common Terminology


Overview


Client Server Concepts 2

• All programs run on the server.

• Workstation provides the user interface

to connect to the server.

• Workstations

– Windows

– Mac

– Linux


Linux

• Evolved from the commercial Unix OS

– An open source operating system

– Free to install

• Very reliable

• A common core; the “kernel”

• Packaged with other software; the

“distribution”


Macintosh

• Older Macintoshes

– Beige, OS 9 and down

– We don’t consider them

• Newer Macintoshes run OS X

– Properly called “OS Ten”

– “The Macintosh GUI on a Darwin core.

– Similar platform to Linux/Unix


Common Distributions

• Centos/Red Hat

• Ubuntu

• Knoppix

• Fedora Core

• Many special purpose distributions

• See http://distrowatch.com for more



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Communications

• Protocol

– An agreed upon convention

• Network protocols

– Different applications use different

protocols

– Different protocols use different sockets or

protocol numbers


The Network

• A modern tcp\ip network

– TCP: Transmission Control Protocol

– IP: Internet Protocol

– Basis of modern networking

• We do not consider Appletalk, Windows

Netbeui, or Novell proprietary

networking


Network Terminology

• Every computer has an IP version 4

address

– Called IPV4

– Four numbers separated by periods

– 192.168.1.100

• We are not using IPV6 yet


Network Terminology 2

• URL

– Universal Resource Locator

– Most people are familiar with web url’s

• http://cset.stcc.edu

– http is the protocol

– cset.stcc.edu is the url

– It is often case sensitive


Security

• Network traffic can be secure or

insecure

• Insecure

– Anyone can monitor the traffic

• Secure

– The traffic is encrypted


Common Insecure Protocols

• http

• telnet

• ftp

• X Windows



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Common Secure Protocols

• https

• ssh

• ftp or scp

• We only use secure protocols for all

sensitive communications


What Do You Need ?

• A Linux account on the cset2 server

• A (web) forum account on the cset

server

• A client workstation which is just a

computer on the internet with an

application that makes a secure

connection to the server

000-Basic Concepts(2)

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