School of Computer Science & Technology
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Computer Networking
A Top-Down Approach Featuring the Internet
计算机网络-自顶向下方法与Internet特色
Chapter 2 Application Layer
Chapter goals
principles of network applications
transport-layer service models
Client/server
P2P
Processes Communication
application-level protocols
HTTP/FTP/SMTP / POP3 / IMAP/DNS
programming network applications
socket API
Socket Programming in Java
Chapter 2: roadmap
2.1 Principles of Network Applications
2.2 The Web and HTTP
2.3 File Transfer Protocol—FTP
2.4 Electronic Mail in the Internet
2.5 DNS- The Internet Directory Service
2.6 P2P File sharing
2.7 Socket Programming with TCP
2.8 Socket Programming with UDP
2.9 Building a Simple Web Server
2.10 Summary
Creating a network application
Write programs that
run on different end systems
communicate over a network.
e.g., Web server / browser
No software written for devices in network core
application
transport
network
data link
physical
application
transport

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