CSC 005 Lecture 17: Lecture 17

• School: Hofstra University
• Department: Computer Science (CSC)
• Course: CSC 005
• Professor: Dennis Mirante

Document Summary

Breaks messages into packets ip software for delivery orders/reassembles packets at destination. Software deals with routing packets to final destination: user datagram protocol (udp) Faster, less reliable than tcp: ping: tests if network computer is active/reachable, traceroute: shows route packet takes across web. Higher-level protocols: simple mail transfer protocol (smtp) Specifies transfer of e-mail: file transfer protocol (ftp) Allows a user to transfer files to/from another computer: telnet: log onto (one) computer from another, hyper text transfer protocol (http): Exchange of web docs: port: number designation that corresponds to a particular higher-level protocol. Mime (multipurpose internet mail extension: standard for defining format of files included as email attachments or on websites. Firewalls: gateway machine and its software that protects a network by filtering the traffic, access control policy: specify what network communications are permitted. Network addresses: hostname: made up of words separated by dots that uniquely id a computer.