User agent
Bridges
Mail gateway
Gateways
Hub
Bridge
Switch
Gateway
Are generally used by personal computers
Allow faster transmission than asynchronous protocols do
Transmit characters one at a time
All of these
Link
Line
Channel
TCP, UDP, TCP and UDP
UDP, TCP, UDP and TCP
UDP, TCP, TCP and UDP
TCP, UDP, UDP and TCP
Repeater
576 bytes
1101 bytes
2202 bytes
4202 bytes
Command decoding
Command declaration
Coder-decoder
Co-declaration
Micro computer
Mainframe
Super computer
Mini computer
1.5 M baud/sec
6 M baud /sec
12 M baud /sec
24 M baud /sec