Computer Science 1032A/B Lecture Notes - Lecture 6: Ieee 802.3, Internet Layer, Short Code

• School: Western University
• Department: Computer Science
• Course: Computer Science 1032A/B
• Professor: Prof.a

Document Summary

Network: collection of computers, communication over transmission line. Types: local area network (lan) comp connected at a single physical site. One small geographic area, communication lines places where needed. Wide area network (wan) comp connected bw 2 + separated sites. Connected comp in diff geographic areas, physically separated. Use a variety of communication networks. (licensed by govt) The internet: collection of networks used to send email & browse a website. 60s problem of incompatible computers solved y arpanet (advanced research projects agency network)- dvlpd the technology that spawned the internet omain name system (dns) Port number, access control list (acl) (filters access via ip), packet filtering (examine source & destination address, & other info) Des data encryption standard & aes advanced encryption standard: Uses a key three times as long as standard des. Used for banks and other organizations that transmit highly sensitive data. Network layers dvlpd by internet engineering task force (ietp)