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Lecture 3: CSCI E-1 Spring 2013
Tommy MacWilliam
February 25, 2013
Education
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Lecture 3: CSCI E-1 Spring 2013
Tommy MacWilliam
February 25, 2013
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Transcript
1
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Computer Science E-1 Lecture 3: Internet
2
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From last time...
3
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http://youtu.be/j84eEjP-RL4
4
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Review: March 4
5
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http://youtu.be/9ntPxdWAWq8
6
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traceroute cnn.com
7
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Clients v. Servers
8
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Routers
9
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Network
10
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None
11
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None
12
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None
13
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Internet Service Provider
14
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None
15
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LAN
16
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WAN
17
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None
18
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traceroute reddit.com
19
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IP Address
20
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10.251.202.239
21
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4,294,967,296
22
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“640K ought to be enough for anybody”
23
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IPv4
24
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IPv6
25
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http://www.worldipv6launch.org/
26
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2001:0db8:85a3:0042: 1000:8a2e:0370:7334
27
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340,282,366,920,938,463,463,374, 607,431,768,211,456
28
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http://samsclass.info/ipv6/ exhaustion.htm
29
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http://www.google.com/ipv6/ statistics.html#tab=ipv6-adoption
30
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Private IP Address
31
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10.*.*.* 172.16.*.* 192.168.*.*
32
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NAT
33
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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
34
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NAT Request • request from 10.0.0.1 reaches router
35
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NAT Request • request from 10.0.0.1 reaches router • router
looks up source port for 10.0.0.1
36
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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
37
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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
38
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NAT Response • router receives response to 74.125.26.228 with source
port 1000
39
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NAT Response • router receives response to 74.125.26.228 with source
port 1000 • router looks up IP address for source port 1000
40
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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
41
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http://www.whatismyip.com/
42
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DHCP
43
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DHCP • Client broadcasts “I would like to join”
44
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DHCP • Client broadcasts “I would like to join” •
Server responds “I can help”
45
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DHCP • Client broadcasts “I would like to join” •
Server responds “I can help” • Client requests an IP address
46
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DHCP • Client broadcasts “I would like to join” •
Server responds “I can help” • Client requests an IP address • Server offers client an IP address
47
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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
48
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None
49
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Connection Speeds
50
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None
51
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Wireless Networks
52
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WEP, WPA, WPA2
53
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3G, 4G
54
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Firewall
55
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None
56
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VPN
57
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Domains
58
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DNS
59
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HOSTS.TXT
60
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DNS Server
61
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Root DNS Server
62
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root-servers.org
63
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TLD DNS Server
64
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Authoritative Name Server
65
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Domain Resolution • hosts file?
66
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Domain Resolution • hosts file? • cache DNS server?
67
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Domain Resolution • hosts file? • cache DNS server? •
root DNS server
68
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Domain Resolution • hosts file? • cache DNS server? •
root DNS server • TLD DNS server
69
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Domain Resolution • hosts file? • cache DNS server? •
root DNS server • TLD DNS server • authoritative name server
70
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http://www.simpledns.com/lookup- dg.aspx
71
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None
72
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Net Neutrality
73
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None
74
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http://www.popsci.com/technology/article/ 2010-07/order-seven-cyber-guardians- around-world-now-hold-keys-internet
75
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Configuring DNS
76
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None
77
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DNS Records • NS: name servers • MX: email •
A: IPv4 address • AAAA: IPv6 address • CNAME: domain alias
78
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TLDs
79
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TLD Usage .com Companies .edu Education .gov US Government .info
Information .mil US Military .net Networks .org Organizations
80
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ccTLDs
81
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ccTLDs • bit.ly: Libya • about.me: Montenegro • del.icio.us: US
• nic.tm: Turkmenistan
82
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http://gtldresult.icann.org/
83
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Registrars
84
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URL
85
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome
86
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Scheme
87
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Authentication
88
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Domain
89
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Port
90
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Path
91
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Query String
92
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http://username:password@ foo.example.com:1234/cs/e1/is.html ?fun=yes&boring=no#awesome Fragment
93
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Key-Value Pairs
94
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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?
95
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q=e&1?
96
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URL Encoding
97
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q=e%261%3F
98
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URI
99
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urn:isbn:9780811822749
100
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http://cse1.net/psets/pset3.pdf
101
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API
102
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http://developer.mbta.com/lib/rthr/ red.json
103
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https://developers.facebook.com/ tools/explorer/
104
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http://youtu.be/Ve7_4ot-Dzs
105
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Summary
106
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Networking • router • IP address • ISP • network
• WAN, LAN • IPv6 • private IP address • NAT • DHCP • 802.11n • 3G, 4G • mbps • firewall • VPN
107
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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
108
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Computer Science E-1 Lecture 3: Internet
Tommy MacWilliam
tmacwill
reverentgeek
rmw
skipperchong
carmenhchung
keathley
productmarketing
clairelew
thoeni
jcasabona
