전체 글31 Computer Networks: Protocols - 1 Computer Networks: Computer Science The first computer networks appeared in the 1950s and 60s They were generally used within an organization - like a company or research lab to facilitate the exchange of information between different people and computers This was faster and more reliable than the previous method of having someone walk a pile of punch cards and stuff to a computer on the other s.. 2020. 10. 11. 좋아하는 일, 같이, 함께. 좋아하는 일을 ‘같이’ 할 수 있는 사람이 있다는 것. ‘함께’ 느낄 수 있다는 건 행복. 2020. 10. 10. History of Web - 2 (original website) info.cern.ch/hypertext/WWW/TheProject.html When the WWW (World Wide Web) got started, we had something called 'the browser wars' where each browser was kind of doing its own thing implementing different things. AND we still have that to this day, to some extent, there is a governing body which kind of creates the standards now. BUT it is still a pain point for developers, where we need to figure.. 2020. 10. 10. History of Web What problems do we have? what solutions do we have? did we find? what problems we are solving and what we did in the past and today World Wide Web 1989 Internet started off with the ARPANET in 1969, military project and it kept growing. The problem they had was they needed a way to share documents and up until the World Wide Web existed. The internet was there BUT It was really hard for compute.. 2020. 10. 10. Website performance fundamentals we send google.com -> we talk to google servers -> we get the files back One way to make websites load faster - Location of Server The internet Back Bone is HUGE so if the servers are really really close to you. The location of the server is important. - How many trips between browser and server? - Size of files 2020. 10. 10. traceroute In Terminal "traceroute google.com" traceroute to google.com (172.217.165.14), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 2.637 ms 1.778 ms 1.326 ms 2 puma7-atom.cogeco.local (192.168.0.1) 1.320 ms 1.726 ms 2.819 ms 3 10.66.0.1 (10.66.0.1) 12.151 ms 16.585 ms 11.434 ms 4 10.0.75.161 (10.0.75.161) 15.303 ms 15.847 ms 15.781 ms 5 10.0.18.69 (10.0.18.69) 13.350 ms 15.233 ms 14.492 ms .. 2020. 10. 10. prev 1 2 3 4 ··· 6 next