( )divides time into time frames and further divides each time frame into N time slots.
A. FDM
B. TDM
CDMA
D. CSMA
查看答案
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.
Which of the following is wrong? ( )
ARP table is configured by a system administrator
B. ARP table is built automatically
C. ARP table is dynamic
D. ARP table maps IP addresses to MAC addresses
The ( )field permits Ethernet to multiplex network-layer protocols.
A. preamble
B. type
CRC
D. destination MAC address
An entry in the switch table contains the following information excepts for ( )
A. the MAC address of a node
B. the switch interface that leads towards the node
C. the time at which the entry for the node was placed in the table
D. the IP address of a node
微信支付 
支付宝支付