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Getting Connected
Overview
Essential Questions
 What
are the ways to transfer
files between computers?
 How
 How
do you use the tools?
does the connectivity
increase your productivity?
Objectives

Demonstrate basic
operational procedures for
Internet client software
including e-mail, Network
News, FTP, Telnet from
multiple client stations.

Use FTP to both send files to
and retrieve files from a
remote system.
The Internet Today
Worldwide network of networks
 Government agencies,
educational institutions,
hospitals, and commercial
organizations
 Phenomenal growth - 1
million/month
 Largest connection of networks
in the world

How the Internet Works
 Local
Connections:
 Modem
 ISDN
 DSL
 Cable
 Satellite
 Businesses/Universities
 T1, T3
 Router at provider’s point-of-presence
 Small providers  big providers
The Internet uses TCP/IP

TCP/IP is the basis
for the Internet.
 IP
resides in the
Network Layer.
 TCP
resides in the
Transport Layer.


Network Protocols
 IP
 TCP
Application Protocols
 Telnet
 HTTP
 FTP
 SMTP
 SNMP
 DNS
Internet Protocol (IP)
IP provides delivery services taking care of
addressing ensuring the routers know what to
do with your data when it arrives.
 Every computer on the Internet has a unique
address.
 Information sent across IP networks is broken
up into bite-sized pieces, called packets.
 The information within a packet is usually
between 1 and about 1500 characters long.

Transmission Control Protocol
Ensures reliability.
 TCP takes the information you
want to transmit and breaks it
into pieces.
 TCP numbers each piece so
receipt can be verified and the
data can be put back in the
proper order.

TCP/IP Applications/Services
SLIP and PPP
 Terminal Emulation (Telnet)
 File Transfer Protocol (FTP)
 HyperText Transfer Protocol (HTTP)
 Simple Mail Transfer Protocol (SMTP)
 Simple Network Management Protocol (SNMP)
 Domain Name Service (DNS)

Various Connectivity Types
 Telnet:
Terminal Emulation
 Logs into remote host systems
 FTP:
File Transfer Protocol
 Client computer  Remote Server
 Logs in to the special file system
Various Connectivity Types
 HTTP:
Hypertext Transfer Protocol
 Underlies the WWW
 HTML is standardized language
 Many different file types accessible.
 SMTP: Simple Mail Transfer Protocol
 Provides a store-and-forward mail
capability between host computer mail
systems on the network
 MIME: Multimedia Internet Mail Exchange
 Standard for document attachments.
DNS: Domain Name Service
 Maps
network address
numbers to an easy to
remember name
136.24.64.138
 Telnet,
www.name.com
FTP and SMTP
access DNS to locate names
you’ve specified and
resolves them to a numeric
address and inserts it into a
message for transport.
Concept Maps
E-mail
Evaluations
References
From Networking 101
Jim Cabral, Puget Technology Group, Inc. &
Tammy Ruth, Children’s Hospital and Medical Center
www.pugettech.com
cabralje@pugettech.com
truth@chmc.org