Getting Connected Overview Getting Connected Overview

Essential Questions u What are the ways to transfer files between computers? u How do you use the tools? u How does the connectivity increase your productivity?

Objectives u Demonstrate basic operational procedures for Internet client software including , Network News, FTP, Telnet from multiple client stations. u Use FTP to both send files to and retrieve files from a remote system.

The Internet Today u Worldwide network of networks u Government agencies, educational institutions, hospitals, and commercial organizations u Phenomenal growth - 1 million/month u Largest connection of networks in the world

How the Internet Works u Local Connections: u Modem u ISDN u DSL u Cable u Satellite u Businesses/Universities u T1, T3 u Router at provider’s point-of-presence u Small providers  big providers

The Internet uses TCP/IP u TCP/IP is the basis for the Internet. u IP resides in the Network Layer. u TCP resides in the Transport Layer. u Network Protocols u IP u TCP u Application Protocols u Telnet u HTTP u FTP u SMTP u SNMP u DNS

Internet Protocol (IP) u IP provides delivery services taking care of addressing ensuring the routers know what to do with your data when it arrives. u Every computer on the Internet has a unique address. u Information sent across IP networks is broken up into bite-sized pieces, called packets. u The information within a packet is usually between 1 and about 1500 characters long.

Transmission Control Protocol u Ensures reliability. u TCP takes the information you want to transmit and breaks it into pieces. u TCP numbers each piece so receipt can be verified and the data can be put back in the proper order.

TCP/IP Applications/Services u SLIP and PPP u Terminal Emulation (Telnet) u File Transfer Protocol (FTP) u HyperText Transfer Protocol (HTTP) u Simple Mail Transfer Protocol (SMTP) u Simple Network Management Protocol (SNMP) u Domain Name Service (DNS)

Various Connectivity Types u Telnet: Terminal Emulation u Logs into remote host systems u FTP: File Transfer Protocol u Client computer  Remote Server u Logs in to the special file system

Various Connectivity Types u HTTP: Hypertext Transfer Protocol u Underlies the WWW u HTML is standardized language u Many different file types accessible. u SMTP: Simple Mail Transfer Protocol u Provides a store-and-forward mail capability between host computer mail systems on the network u MIME: Multimedia Internet Mail Exchange u Standard for document attachments.

DNS: Domain Name Service u Maps network address numbers to an easy to remember name u Telnet, 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

Evaluations

References From Networking 101 Jim Cabral, Puget Technology Group, Inc. & Tammy Ruth, Children’s Hospital and Medical Center