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- A</B>．srvers
- B</B>．administrators
- C</B>．computers
- D</B>．routers
- A</B>．network growth
- B</B>．network structure
- C</B>．network architecture
- D</B>．network servers
- A</B>．administrators
- B</B>．agents
- C</B>．managers
- D</B>．servers
- A</B>．network stations
- B</B>．network clients
- C</B>．network devices
- D</B>．network seI'vers
- A</B>．Physical Layer
- B</B>．Link Layer
- C</B>．Network Layer
- D</B>．Transport Layer
- A</B>．Permanent Circuits
- B</B>．Permanent Virtual Circuits
- C</B>．Switched Virtual Circuits
- D</B>．Switched Circuits
- A</B>．DLCIs
- B</B>．HDLCs
- C</B>．SDLCs
- D</B>．DLs
- A</B>．Permanent Circuits
- B</B>．Permanent Virtual Circuits
- C</B>．Switched Virtual Circuits
- D</B>．Switching Circuits
- A</B>．Datagram Switching
- B</B>．Datagram Routing
- C</B>．Packet Switching
- D</B>．packet Routing
- A</B>．X.21
- B</B>．X<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue=".25" UnitName="C">.25 </st1:chmetcnv>C</B>．X.28
- D</B>．X.29
