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3 10000 things all ICS students should do before graduating 0000 : Buy your own domain name : Install an Apache web server and configure it in a non-trivial way, e.g. to serve multiple domains. Apache 0010 : Install WordPress and have your own blog. Write blog posts regularly. Write well. Good writing is a critical skill to master in this profession. WordPress blog 0011 : Run your own web site at home or in a hosting company. Web 0100 : Write at least one complete LAMP web app, preferably two : one where P=PHP, the other where P=Python. LAMP Web PHP Python 0101 : Have your own [physical or virtual] server on the cloud : Install VMWare or equivalent in order to boot up your laptop with more than one OS. VMware PC OS 0111 : Configure your home DSL router so that you serve a web site or other kind of server from your home machine / laptop to your friends. DSL Web 4 / 21

4 10000 things all ICS students should do before graduating 1000 : Use a packet sniffer to learn about the network requests your computer does to your favorite game server : Make contributions to an open source project : Write an app that uses at least one of the popular Web APIs, like Facebook Connect or one of Google s. Facebook Connect Google Web API 1011 : Use Google AdSense on your web site, and make money just by virtue of attracting traffic. Google AdSense Web 1100 : Compile a complicated open source project from scratch, like OpenSim or Matterhorn. OpenSim Matterhorn OSS : Read works of literature and, besides enjoying the ride, pay close attention to how the author tells the story and makes use of words. Your programs should be as carefully written as those works of art! 1110 : Get yourself involved in a software project where requirements are bound to change halfway through : that s about 0.01% of homework projects and about 99.99% of real world projects, so find one of the latter kind. Finish the project with patience and the ability to take criticism in a constructive way : Write an application using map-reduce. Run it on Google app-engine or amazon EC2. map-reduce Google amazon EC2 5 / 21

5 ( ) (howto tips )?? ( ) ( ) 6 / 21

6 1 2 HTTP 3 HTML4 4 (JavaScript, DOM, CSS) 5 (JavaScript, Library) 6 7 (mashup) 8 XML 9 HTML5 ( HTML5) 10 HTML5 (HTML5 ) 11 REST 12 Web / 21

7 ( ) Client Server 3-tier MVC Layer Layer violation Compatibility & Connectivity browser compatibility version compatibility (forward, backward) (JS ) Security same origin sanitize (XSS) hash,, 8 / 21

8 ARPANET: 1960 TCP/IP: 1970 TCP/IP (UNIX ) : 1980 WWW HTTP0.9: 1990 NCSA Mosaic: / 21

9 IETF RFC ( Internet Draft, Proposed Standard, Draft Standard, Internet Standard W3C (World Wide Web Consortium) WHATWG OASIS defacto 10 / 21

10 C Socket client.c: C server.c: C pollserver.c: C ( poll) selserv.c, selcli.c,: C ( select) Java Socket Client.java: Java Server.java: Java Mserver.java: Java 11 / 21

11 ネットワークの 基 本 構 成 ネットワークの 基 本 構 成 ルーター PC PC PC PC PC PC PC PC ルーター ルーター サブネット(セグメントとも 言 う) PC PC PC PC PC PC PC PC

12 通 信 方 式 (サブネット 内 ) 通 信 のデータ 単 位 :パケット 宛 先 MACアドレス (48bit) 送 信 元 MACアドレス (48bit) データ 長 (16bit) データ (1500バイト) MACアドレスはハードを 製 造 した 時 に 割 り 当 てられている セグメント 内 は 全 PCにパケットが 伝 わる PC MAC: 100 PC MAC: 200 PC MAC: 300 PC MAC: 400 自 分 宛 じゃない あ, 自 分 宛 だ 自 分 宛 じゃない

13 通 信 方 式 (サブネット 間 ) サブネットの 収 容 台 数 を 増 やすとパケット 衝 突 が 増 加 サブネットを 越 えてパケットを 送 る 仕 組 みが 必 要 IPアドレスによる 配 信 パケット 構 成 宛 先 MAC 送 信 元 MAC 長 さ... 送 信 元 IPアドレス 32bit 宛 先 IPアドレス 32bit データ IPアドレスは32bitの 数 値 IPアドレス ネットワークアドレス ホストアドレス 普 通 はバイトで 区 切 って 書 く 例 : ( 当 面, 最 下 位 のバイトがホストアドレスとする)

14 通 信 方 式 (サブネット 間 ) ルーターがサブネット 間 を 中 継 する サブネット dst= , src= PC MAC: 700 IP: MAC:600 ルーター MAC:500 サブネット からのパケットを 一 旦 受 け 取 りサブネット 側 に 再 送 信 する サブネット dst= , src= PC MAC: 100 IP: PC MAC: 200 IP: PC MAC: 300 IP: PC MAC: 400 IP:

15 TCP (Transport Control Protocol) IP UDP protocol, src addr, dst addr, src port, dst port 5 well-known port application writer 16 / 21

16 IP TCP パケットダンプ(Wireshark)

17 DNS (Domain Name System) FQDN IP IP ( ) in-addr.arpa MX 18 / 21

18 DHCP Dynamic DNS IP NIC NAT NAPT IPv6 IPv4 19 / 21

19 BSD socket ( BSD UNIX ) API TCP socket SOCK STREAM IO (C Java) 20 / 21

20 QUIC Google Transport Layer Protocol (TCP layer) QUIC = Quick UDP Internet Connections TCP SCTP RFC QUIC TCP Fast Open Chrome Google 0-RTT connection Packet pacing Mobile interface migration FEC (forward error correction) 21 / 21

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