HHS_en04_Services_and_Connections.pdf

LESSON 4

SERVICES AND

CONNECTIONS

LESSON 4 – SERVICES AND CONNECTIONS

“License for Use” Information

The following lessons and workbooks are open and publicly available under the following

terms and conditions of ISECOM:

All works in the Hacker Highschool project are provided for non-commercial use with

elementary school students, junior high school students, and high school students whether in a

public institution, private institution, or a part of home-schooling. These materials may not be

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these materials for which a fee is charged is expressly forbidden without a license including

college classes, university classes, trade-school classes, summer or computer camps, and

similar. To purchase a license, visit the LICENSE section of the Hacker Highschool web page at

www.hackerhighschool.org/license .

The HHS Project is a learning tool and as with any learning tool, the instruction is the influence

of the instructor and not the tool. ISECOM cannot accept responsibility for how any

information herein is applied or abused.

The HHS Project is an open community effort and if you find value in this project, we do ask

you support us through the purchase of a license, a donation, or sponsorship.

All works copyright ISECOM, 2004.

LESSON 4 – SERVICES AND CONNECTIONS

Table of Contents

“License for Use” Information...............................................................................................................2

Contributors..............................................................................................................................................4

4.0 Introduction........................................................................................................................................5

4.1 Services...............................................................................................................................................6

4.1.1 HTTP and The Web.....................................................................................................................6

4.1.2 E-Mail – POP and SMTP..............................................................................................................7

4.1.3 IRC................................................................................................................................................8

4.1.4 FTP................................................................................................................................................8

4.1.5 Telnet and SSH..........................................................................................................................10

4.1.6 DNS.............................................................................................................................................10

4.1.7 DHCP.........................................................................................................................................11

4.2 Connections.....................................................................................................................................12

4.2.1 ISPs ............................................................................................................................................12

4.2.2 Plain Old Telephone Service...................................................................................................12

4.2.3 DSL..............................................................................................................................................12

4.2.4 Cable Modems........................................................................................................................13

Further Reading.....................................................................................................................................14