分类： 网络与安全
2011-08-24 09:55:26
提到协议分层，我们很容易联想到ISO-OSI的七层协议经典架构，但是TCP/IP协议族的结构则稍有不同。如图所示
The following table shows the layer names and the number of layers of networking models presented in and textbooks in widespread use in today's university computer networking courses.
| Tanenbaum | Cisco Academy | Kurose Forouzan | Comer Kozierok | Stallings | Arpanet Reference Model 1982 () | |
|---|---|---|---|---|---|---|
| Four layers | Four layers | Four layers | Five layers | Four+one layers | Five layers | Three layers |
| "Internet model"[] | "TCP/IP reference model" | "Internet model" | "Five-layer Internet model" or "TCP/IP protocol suite" | "TCP/IP 5-layer reference model" | "TCP/IP model" | "Arpanet reference model" |
| Application | Application | Application | Application | Application | Application | Application/Process |
| Transport | Transport | Transport | Transport | Transport | Host-to-host or transport | Host-to-host |
| Internet | Internet | Internetwork | Network | Internet | Internet | |
| Link | Host-to-network | Network interface | Data link | Data link (Network interface) | Network access | Network interface |
| Physical | (Hardware) | Physical |
| OSI Model | ||||
|---|---|---|---|---|
| Data unit | Layer | Function | ||
| Host layers |
Data | 7. | Network process to application | |
| 6. | Data representation, encryption and decryption, convert machine dependent data to machine independent data | |||
| 5. | Interhost communication | |||
| Segments | 4. | End-to-end connections, reliability and | ||
| Media layers |
Packet/Datagram | 3. | Path determination and | |
| Frame | 2. | Physical addressing | ||
| Bit | 1. | Media, signal and binary transmission | ||
