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- A</B>．FTP
- B</B>．UDP
- C</B>．IP
- D</B>．HTTP
- A</B>．full-duplex
- B</B>．half-duplex
- C</B>．simplex
- D</B>．complex
- A</B>．Email address and IP address
- B</B>．MAC address and port address
- C</B>．MAC address and IP address
- D</B>．port number and IP address
- A</B>．is made of
- B</B>．composed of
- C</B>．is composed of
- D</B>．is consisted of
- A</B>．Buffer
- B</B>．Source-quench messages
- C</B>．Buffering
- D</B>．Windowing
- A</B>．Buffer
- B</B>．Source-quench messages
- C</B>．Buffering
- D</B>．Windowing
- A</B>．transmitting devices
- B</B>．transmitted devices
- C</B>．receiving devices
- D</B>．received devices
- A</B>．Buffer
- B</B>．Source-quench messages
- C</B>．Buffering
- D</B>．Windowing
- A</B>．transmitting devices
- B</B>．transmitted devices
- C</B>．receiving devices
- D</B>．received devices
