1. Modem is used in data transmission. When was it invented and in which country?
A. 1963, USA
B. 1965, Germany
C. 1950, USA
D. 1950, Japan
E. None of the above
2. Which of the following technique is used for Time-To-Line (TTL)?
A. a technique used in best-effort delivery system to avoid endlessly looping packets.
B. a technique used by protocols in which a lower level protocol accepts a message from a higher level protocol and places it in the data portion of the low level frame
C. One of the pieces that results when an IP gateway divides an IP datagram into smaller pieces for transmission across a network that cannot handle the original datagram size.
D. All of the above
E. None of the above
3. Communication network is
A. one or more conductors that serve as a common connection for a related group of devices
B. a continuous frequency capable of being modulated or impressed with a second signal
C. the condition with two or more stations attempt to use the same channel at the same time
D. a collection of interconnected functional units that provides a data communications service among stations attached to the network
E. None of the above
4. Which of the following is an advantage to using fiber optics data transmission?
A. resistance to data theft
B. fast data transmission rate
C. low noise level
D. few transmission errors
E. All of the above
5. Which of the following statement is incorrect?
A. if a host moves from one network to another, its IP address must change
B. routing uses the network portion of the IP address, the path taken by packets travelling to a host with multiple IP addresses depends on the address used.
C. IP addresses encode both a network and a host on that network, they do not specify an individual machine, but a connection to a network.
D. All of the above
E. None of the above