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CIS 115
How the Internet Works
Circuit Switching
Image Source: Wikipedia
Packet Switching - Paul Baran
Image Source: Wikipedia
7 Layer OSI Network Model
Encapsulation
Image Source: Wikipedia
Physical - 100BASE-T
Image Source: Wikipedia
Data Link - Ethernet
Image Source: Wikipedia
Network - IPv4
IPv4 Packet Structure | |
Version Info | Length |
Packet ID | Flags & Offset |
Protocol & TTL | Checksum |
Source IP Address | |
Destination IP Address | |
Data... |
IPv4 vs. IPv6
IPv4: 32 bit Addresses
232 = 4,294,967,296
IPv6: 128 bit Addresses
2128 = 340,282,366,920,938,463,463,
374,607,431,768,211,456
or 340 Undecillion addresses
Network - IPv6
Image Source: Wikipedia
Image Source: XKCD
Transport - TCP
TCP Packet Structure | |
Source Port | Dest. Port |
Sequence Number | |
Acknowledgement Number | |
Options | Length |
Checksum | Urgent |
Data... |
Transport - UDP
UDP Packet Structure | |
Source Port | Dest. Port |
Length | Checksum |
Data... |
TCP vs. UDP
TCP | UDP |
Connection Oriented | Connectionless |
Reliable | Unreliable |
Acknowledge | No Acknowledge |
Applications
Domain Name System (DNS)
"Phonebook for the Internet"
Image Source: Wikipedia
DNS Lookup
Image Source: Wikipedia
Dynamic Host Configuration Protocol (DHCP)
Image Source: Tech Juice
HyperText Transfer Protocol (HTTP)
Image Source: Wikipedia
Image Source: Wikipedia
HTTP Commands
HTTP Status Codes
HTTP Status Codes
Assignments
Blog 4: The Internet's Influence
The internet has been a major force in our lives for several decades now. Write about how the internet has influenced you as a person. Try and think about ways that you would be a different person if you didn’t have the internet. Things you can think about:The internet is a very influential part of our modern culture. Because of this, most of us have been impacted by the internet in some way throughout our lives. For this blog article, write about how the internet has impacted you as an individual, but also how you believe the internet has impacted us as a society in general. (Food for thought: - read about the Filter Bubble or Cyberculture for ideas: https://en.wikipedia.org/wiki/Filter_bubble and https://en.wikipedia.org/wiki/Cyberculture). As you are writing, here are some things you can think about:
Packet Switching Activity
DHCP Request
DHCP Response
DNS Lookup
DNS Response
HTTP Request
HTTP Response