(65)
- A．half duplex
- B．full duplex
- C．half or full duplex
- D．half and full duplex
-
(65)
- A．half duplex
- B．full duplex
- C．half or full duplex
- D．half and full duplex
-
(64)
- A．a primary station
- B．one or more primary stations
- C．a secondary station
- D．one or more secondary stations
-
(63)
- A．a primary station
- B．one or more primary stations
- C．a secondary station
- D．one or more secondary stations
-
SDLC was invented by IBM to replace the older Bisynchronous protocol for wide area connections between IBM equipment . A varietion of the (71) protocol called NRM is essentially the same as SDLC. SDLC is (72) protocol like HDLC, Frame. Relay or X.25. An SDLC network is made up of (73) that controls all communications, and (74) . It is capable of (75) operation, but almost all practical applications are strictly half duplex.
- A．HDLC
- B．Frame. Relay
- C．X.25
- D．X.21
-
(62)
- A．a peer to peer
- B．a point-to-point
- C．not a peer to peer
- D．a peer to peers
-
(59)
- A．bits
- B．frequencies
- C．packets
- D．messages
-
(60)
- A．rate
- B．velocity
- C．bandwidth
- D．period
-
(57)
- A．direct-sequence
- B．discrete-sequence
- C．duplicate-sequence
- D．dedicate-sequence
-
(58)
- A．data
- B．byte
- C．packet
- D．bit
-
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in(66)pieces over a number of the discrete frequencies available for use at any time in the specified range. Devices using(67) spread spectrum (DSSS)communicate by splitting each(68)of data into several parts and sending them concurrently on different (69), DSSS uses a lot of the available(70), about 22 megahertz (MHz).
- A．small
- B．high
- C．low
- D．long
高级经济师考试试题精选练习（1）
高级经济师考试模拟练习题之单选题（1
高级经济师考试试题精选练习（2）
高级经济师考试试题精选练习（3）
高级经济师考试试题：经济法案例试题精
高级经济师考试模拟试题及答案
高级经济师考试试题及答案：单选练习题
高级经济师考试试题：经济法案例试题精
高级经济师考试模拟题及答案练习(1)
高级经济师考试模拟题及答案练习(2)