Computer Networking — A Top-Down Approach Chpt 2
CHAPTER 2
1. Network Application — Server-Client; P2P
2. Socket — interface between process
3. Transport Services: Throughput, timing, security
4. SSL — Secure Socket Layer
5. TCP vsUDP
6. Application Layer Protocals
7. Web & HTTP
8. Non-Persistent and Persistent Connections
9. Three-way handshake
10. Round-trip time — RTT; Small package to travel from client to server
11. HTTP Msg & Response Format
12. Cookie — a nice Case study
13. Web Caching — Proxy Server; installed by ISP; Maybe university or major residential; calculation is similiar to cache
14. Content Distribution Networks (CDNs) — shared CDNs; dedicated CDNs (Google)
15. FTP — Similiar to HTTP, but server needs to maintain state about the user
16. SMTP
17. SMTP →POP3; IMAP—Post Office Protocol V; Internet Mail Access Protocol
18. DNS — services: Host aliasing; Mail server aliasing; Load Distribution; LOAD Distribution
19. DNS →a wonderful example of distributed database. problems: A single point failure; Traffic volume; Distant centralized database; Maintenance
20. Root DNS servers; Top-level domain (TLD) servers; Authoritative DNS servers; local DNS server
The query from the requesting host to the local DNS server is recur-
sive, and the remaining queries are iterative.
21. DNS Caching
22. DNS Record type / Format
23. p2p applications — //TODO here P145 ~ P156
24. Socket Programming — UDP, TCP
25. Port number
attaching the source address to the packet is typically not done by the UDP application code; instead it is automatically done by the underlying operating system.
26. Python code = =
27. TCP — connection-oriented; need handshake; the connection is fixed and can be used directly
During the three-way handshake, the client process knocks on the welcoming door of the server process. When the server “hears” the knocking, it creates a new door — more precisely, a new socket that is dedicated to that particular client.
With TCP, all bytes sent from one side not are not only guaranteed to arrive at the other side but also guaranteed arrive in order.
28. some programming assignments are worth trying
