Application-layer
Protocols
Topics
Application Protocol
Design
In Summary
Learn by Example
Knock-Knock Protocol
Java Implementation
Supporting multiple
clients
The TELNET Protocol
TELNET vs. telnet
The TELNET Protocol
Network Virtual Terminal
Network Virtual Terminal
Negotiated Options
Negotiated Options
Option examples
Control Functions
Control Functions
More Control Functions
Command Structure
Looking for Commands
Command Codes
Playing with TELNET
Some TCP Servers you can
play with
telnet hostname port
telnet vs. TCP
FTP
File Transfer Protocol
FTP Objectives
(from RFC 959)
The FTP Model
Control and Data
Connections
Control Connection
Standard Connection Model
Alternative Connection
Model
Access Control Commands
Transfer Parameter
Commands
Service Commands
FTP Replies
FTP Reply Status Code
FTP Reply Status Code
Data Transfer Modes
RFC 959
Address Conversion
Functions and
The Domain Name System
Hostnames
The Domain Name System
DNS Hierarchy
Host name structure
Domain Name
Top level domains
DNS Organization
DNS Distributed Database
DNS Clients
/etc/resolv.conf
nslookup
"$ nslookup"
DNS Servers
Server - Server
Communication
DNS Data
The Root DNS Server
Server Operation
DNS Message Format
DNS Message Header
Message Flags
Recursion
Question Format
Response Resource Record
UDP & TCP
Lots more
Internet Addresses in
Java
Printing Internet
Addresses
Additional InetAddress
methods
Additional InetAddress
methods