Incomplete slides: Networking Basics

Transcript

1. Sniffing open networks An introduction to networking
2. whoami Ambrose Chua @ambrosechua Likes: “Full-stack”: UX/UI to Networking
3. Computer Networks • Link computers together to tansmit data
4. Internet • Began as a link between a few research and university machines – ARPANET 's first message sent 29 October 1969 • Internet's TCP/IP replaced the then NCP
5. TCP/IP model Physical Data Link Network Transport Application
6. Physical • Ethernet • 802.11 • Dictates bit-by-bit transmission • Unreliable
7. Link • Ethernet • 802.11 • Implements Media Access Control (MAC) • Operates between two adjacent nodes, enabling communicaiton between them • Can be unreliable
8. Network • IPv4 / IPv6 • ICMP / IMCPv6 • Combines adjacent nodes to form an entire network • Identify nodes in the network • The Internet • Unreliable
9. Transport • TCP • UDP • Provide different types of reliability and transport mechanisms • Ports for multiple transmissions
10. Transmission Control Protocol • Reliable • Connection-based • Flow control • Same-order delivery
11. User Datagram Protocol • Unreliable • Datagram-based • No flow control • No same-order delivery
12. Application • DNS, NTP, DHCP, Telnet, FTP, SSL/TLS, HTTP... • Anything that transmits over a transport protocol, or even through another application protocol • Independent of network functions