With ( )transmission, the nodes at both ends of a link may transmit packets at the same time.
A. half-duplex（半双工）
B. full-duplex（全双工）
C. simplex(单工)
D. synchronous
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With ( ) transmission, a node can not both transmit and receive at the same time.
A. half-duplex（半双工）
B. full-duplex（全双工）
C. simplex(单工)
D. synchronous
Which of the following functions can’t be implemented in the NIC? ( )
A. encapsulation and decapsulation
B. error detection
C. multiple access protocol
D. routing
( )divides time into time frames and further divides each time frame into N time slots.
A. FDM
B. TDM
CDMA
D. CSMA
Which of the following four descriptions about random access protocol is not correct? ( )
A transmission node transmits at the full rate of the channel
B. When a collision happens, each node involved in the collision retransmits at once.
C. Both slotted ALOHA and CSMA/CD are random access protocols.
D. With random access protocol, there may be empty slots.
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