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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
[email protected]
[email protected]