1.What process is used to place one message inside another message for transfer from the source to the destination?
A. access control
B. decoding
C. encapsulation
D. flow control
2.What is an advantage of network devices using open standard protocols?
A. Network communications is confined to data transfers between devices from the same vendor.
B. A client host and a server running different operating systems can successfully exchange data.
C. Internet access can be controlled by a single ISP in each market.
D. Competition and innovation are limited to specific types of products.
3.What is indicated by the term throughput?
A. the guaranteed data transfer rate offered by an ISP
B. the capacity of a particular medium to carry data
C. the measure of the usable data transferred across the media
D. the measure of the bits transferred across the media over a given period of time
E. the time it takes for a message to get from sender to receiver
4.Which method of data transfer allows information to be sent and received at the same time?
A. full duplex
B. half duplex
C. multiplex
D. simplex
5.What is the function of the CRC value that is found in the FCS field of a frame?
A. to verify the integrity of the received frame
B. to verify the physical address in the frame
C. to verify the logical address in the frame
D. to compute the checksum header for the data field in the frame
答案：
| 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|
| C | B | D | A | A |
