Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Lecture 3: CSCI E-1 Spring 2013
Search
Tommy MacWilliam
February 25, 2013
Education
0
510
Lecture 3: CSCI E-1 Spring 2013
Tommy MacWilliam
February 25, 2013
Tweet
Share
More Decks by Tommy MacWilliam
See All by Tommy MacWilliam
Lecture 9: CSCI E-1 Spring 2013
tmacwill
0
330
Lecture 8: CSCI E-1 Spring 2013
tmacwill
0
490
Lecture 6: CSCI E-1 Spring 2013
tmacwill
1
480
Lecture 7: CSCI E-1 Spring 2013
tmacwill
0
600
Lecture 5: CSCI E-1 Spring 2013
tmacwill
1
640
Incorporating Version Control into Programming Courses
tmacwill
1
120
Lecture 4: CSCI E-1 Spring 2013
tmacwill
0
430
Lecture 2: CSCI E-1 Spring 2013
tmacwill
0
850
Lecture 1: CSCI E-1 Spring 2013
tmacwill
0
320
Other Decks in Education
See All in Education
Data Processing and Visualisation Frameworks - Lecture 6 - Information Visualisation (4019538FNR)
signer
PRO
1
2.4k
諸外国の理科カリキュラムにおけるビッグアイデアの構造比較
arumakan
0
310
Virtual and Augmented Reality - Lecture 8 - Next Generation User Interfaces (4018166FNR)
signer
PRO
0
1.7k
Common STIs in London: Symptoms, Risks & Prevention
medicaldental
0
130
データ分析
takenawa
0
4.9k
ANS-C01_2回不合格から合格までの道程
amarelo_n24
1
240
AIの時代こそ、考える知的学習術
yum3
2
160
View Manipulation and Reduction - Lecture 9 - Information Visualisation (4019538FNR)
signer
PRO
1
2k
第1回大学院理工学系説明会|東京科学大学(Science Tokyo)
sciencetokyo
PRO
0
3.8k
『会社を知ってもらう』から『安心して活躍してもらう』までの プロセスとフロー
sasakendayo
0
230
Gaps in Therapy in IBD - IBDInnovate 2025 CCF
higgi13425
0
480
AIC 103 - Applications of Property Valuation: Essential Slides
rmccaic
0
200
Featured
See All Featured
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
The Cost Of JavaScript in 2023
addyosmani
51
8.4k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
357
30k
Side Projects
sachag
455
42k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Optimising Largest Contentful Paint
csswizardry
37
3.3k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
What's in a price? How to price your products and services
michaelherold
246
12k
StorybookのUI Testing Handbookを読んだ
zakiyama
30
5.8k
Stop Working from a Prison Cell
hatefulcrawdad
270
20k
Faster Mobile Websites
deanohume
307
31k
Transcript
Computer Science E-1 Lecture 3: Internet
From last time...
http://youtu.be/j84eEjP-RL4
Review: March 4
http://youtu.be/9ntPxdWAWq8
traceroute cnn.com
Clients v. Servers
Routers
Network
None
None
None
Internet Service Provider
None
LAN
WAN
None
traceroute reddit.com
IP Address
10.251.202.239
4,294,967,296
“640K ought to be enough for anybody”
IPv4
IPv6
http://www.worldipv6launch.org/
2001:0db8:85a3:0042: 1000:8a2e:0370:7334
340,282,366,920,938,463,463,374, 607,431,768,211,456
http://samsclass.info/ipv6/ exhaustion.htm
http://www.google.com/ipv6/ statistics.html#tab=ipv6-adoption
Private IP Address
10.*.*.* 172.16.*.* 192.168.*.*
NAT
Device Private IP Public IP Source Port Macbook 10.0.0.1 74.125.26.228
1000 iPhone 10.0.0.2 74.125.26.228 1001 iPad 10.0.0.3 74.125.26.228 1002
NAT Request • request from 10.0.0.1 reaches router
NAT Request • request from 10.0.0.1 reaches router • router
looks up source port for 10.0.0.1
NAT Request • request from 10.0.0.1 reaches router • router
looks up source port for 10.0.0.1 • router changes source IP to 74.125.26.228, adds source port 1000
NAT Request • request from 10.0.0.1 reaches router • router
looks up source port for 10.0.0.1 • router changes source IP to 74.125.26.228, adds source port 1000 • router sends modified request to destination
NAT Response • router receives response to 74.125.26.228 with source
port 1000
NAT Response • router receives response to 74.125.26.228 with source
port 1000 • router looks up IP address for source port 1000
NAT Response • router receives response to 74.125.26.228 with source
port 1000 • router looks up IP address for source port 1000 • router forwards response to original client
http://www.whatismyip.com/
DHCP
DHCP • Client broadcasts “I would like to join”
DHCP • Client broadcasts “I would like to join” •
Server responds “I can help”
DHCP • Client broadcasts “I would like to join” •
Server responds “I can help” • Client requests an IP address
DHCP • Client broadcasts “I would like to join” •
Server responds “I can help” • Client requests an IP address • Server offers client an IP address
DHCP • Client broadcasts “I would like to join” •
Server responds “I can help” • Client requests an IP address • Server offers client an IP address • Client confirms IP address
None
Connection Speeds
None
Wireless Networks
WEP, WPA, WPA2
3G, 4G
Firewall
None
VPN
Domains
DNS
HOSTS.TXT
DNS Server
Root DNS Server
root-servers.org
TLD DNS Server
Authoritative Name Server
Domain Resolution • hosts file?
Domain Resolution • hosts file? • cache DNS server?
Domain Resolution • hosts file? • cache DNS server? •
root DNS server
Domain Resolution • hosts file? • cache DNS server? •
root DNS server • TLD DNS server
Domain Resolution • hosts file? • cache DNS server? •
root DNS server • TLD DNS server • authoritative name server
http://www.simpledns.com/lookup- dg.aspx
None
Net Neutrality
None
http://www.popsci.com/technology/article/ 2010-07/order-seven-cyber-guardians- around-world-now-hold-keys-internet
Configuring DNS
None
DNS Records • NS: name servers • MX: email •
A: IPv4 address • AAAA: IPv6 address • CNAME: domain alias
TLDs
TLD Usage .com Companies .edu Education .gov US Government .info
Information .mil US Military .net Networks .org Organizations
ccTLDs
ccTLDs • bit.ly: Libya • about.me: Montenegro • del.icio.us: US
• nic.tm: Turkmenistan
http://gtldresult.icann.org/
Registrars
URL
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Scheme
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Authentication
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Domain
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Port
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Path
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Query String
http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Fragment
Key-Value Pairs
query=cse1&page=3 • client • the query I want is cse1
• the page I want is 3 • server • what query and page should I look for?
q=e&1?
URL Encoding
q=e%261%3F
URI
urn:isbn:9780811822749
http://cse1.net/psets/pset3.pdf
API
http://developer.mbta.com/lib/rthr/ red.json
https://developers.facebook.com/ tools/explorer/
http://youtu.be/Ve7_4ot-Dzs
Summary
Networking • router • IP address • ISP • network
• WAN, LAN • IPv6 • private IP address • NAT • DHCP • 802.11n • 3G, 4G • mbps • firewall • VPN
Domain Name System • DNS • domains • hosts file
• root DNS server • TLD DNS server • authoritative name server • net neutrality • A record • CNAME record • TLD, ccTLD • registrar • URL • URI • API
Computer Science E-1 Lecture 3: Internet