lecture 7

Comsc-100 Lecture 7
Networking

Instructor: Prof. Tony Chern (tchern@dvc.edu)

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OSI 7 Layer Reference Wiki OSI Model  Media (1-3) Layers Physical - bit Link - frame Network - packet Host (4-6) Layers Presentation - segment Session - data Transport Application (7th) Layer  Advantages p.308-p.309 LAN and WAN to share resources: Peripheral  Storage - Folders and Files Router - Internet Access Network Architecture Peer-to-Peer Network: locally managed Client/Server Network: centrally managedComputer Languages programs for typing computer code computer language   strict, simplified versions of English strict: spell, case, and puncuate just right   VISUAL 5 simplified: uses a small set of keywords (100 or so)   if, while, for, break,... VISUAL 6 Text Editors Windows XP Notepad VISUAL 7   with status bar and no wrap UNIX or Linux vi VISUAL 8 Apple MacOSx TextEdit avoid RTF editors like WordPad avoid word processors   formatting and pagination

Code Editors And IDEs syntax highlighting, templates,... JNotePad (avail. from class website) VISUAL 9 many free or inexpensive programs on Internet interactive development environments (IDEs) VISUAL 10   built-in code editor   1-key compiling   step-by-step debugging Compilers convert code into computer program   code: in .cpp files     VISUAL 11   program: in executable files     VISUAL 12 Elements Of The Language VISUAL 13: textbook section 1.4.1 statement -- like a sentence expression -- like a phrase Sequential Processing left-to-right in a "line" lines top-to-bottom "learning experiences" vs. instructions   computers follow instructions   they do not remember relationships   e.g.: what does area = width * height mean? Detours! interuptions in sequential processing branching: skipping lines looping: repeating back to a line subprograms: moving details elsewhere

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Watch this space
This space at the end of the lecture notes is used in future lecture notes to include "how to's", with practical examples to help you with your lab assignments. These are not discussed in lectures or in any other written materials for this class, so make sure that you look for them yourself! Here's one now:

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How to program
Right-click (or ctrl-click on Apple) here to download and save a brief, introductory PDF!