文档介绍：Chapter 2 Application Layer
working: A Top Down Approach Featuring the , 3rd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2004.
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2: Application Layer
Chapter 2: Application layer
Principles work applications
Web and HTTP
FTP
Electronic Mail
SMTP, POP3, IMAP
DNS
P2P file sharing
Socket programming with TCP
Socket programming with UDP
Building a Web server
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2: Application Layer
Chapter 2: Application Layer
Our goals:
conceptual, implementation aspects work application protocols
transport-layer service models
client-server paradigm
peer-to-peer paradigm
learn about protocols by examining popular application-level protocols
HTTP
FTP
SMTP / POP3 / IMAP
DNS
work applications
socket API
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2: Application Layer
work apps
E-mail
Web
Instant messaging
Remote login
P2P file sharing
Multi-work games
Streaming stored video clips
telephone
Real-time video conference
Massive puting
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2: Application Layer
Creating work app
Write programs that
run on different end systems municate over work.
., Web: Web server municates with browser software
little software written for devices work work core devices do not run user application code
appl