*續(1) 七層

1 Physical Binary Transmission -- wires connectors voltages

2 MAC(存取不同媒介) ,LLC,Direct Link Control,Access to Media

3. Network Address & Best Path Determination

4. End to End Connections

5. Interhost Communication,between application

用browser 連 server-->這是web application

6 Data Representation: transfer syntax

7 Network Processes to Application

*Peer to Peer Communication

PDU --> Protocol Data Unit

7~5 data

4 segment

3 packets(datagram --> internet的術語)

2 frames

1 bits

*TCP/IP Model-->簡化成4層

7~5 Application --> Generic Client (Browser)<老師覺得最好的>

4 Transport --> Logical Network

3 Internet --> Protocol Network( Ipv4-Ipv6 )

1~2 Network Access --> Physical Network

*encapsulation-->加頭加尾,將資料封裝,才送出(有點像寫地址)

*(下一章)

Network Media(傳輸的媒介)

無線:電磁

有線:雙絞線 同軸電纜 光纖