Class Notes (834,991)
United States (324,008)
IST 195 (86)
Rubin (22)
Lecture

Networks

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Department
Information Studies
Course
IST 195
Professor
Rubin
Semester
Fall

Description
-Prior to the internet -Circuit switched network -- phone sys. -Original internet = ARPANET -Created for Dept of Defense -Packet switched networks -Redundancy -- if one line of comm. broke, others were available -Packet components -Source & destination IP -Protocol (what type of packet it is) -Sequence # (how many packets there are) -Acknowledgement # (“yes, I got packet 2") -Data -What is a protocol? -Rules of communication -Syntax & semantics -Consists of small acts -Can relate to other protocols in layers -Web protocol: HTTP -Hypertext tranfer protocol -4-step process btwn client & web server -Client to server: make connection -Client to server: HTTP requests -Server to client: send requested info -Client to server: close connection -Additional internet protocols -POP, IMAP, SMTP = email -POP: once email is transferred, no longer exists on server -IMAP: copies all email & folders -SMTP: how email servers communicate -FTP = f
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