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981. Which address is the loopback address?
E. None of the above

982. Error rate is
A. an error-detecting code based on a summation operation performed on the bits to be checked.
B. a check bit appended to an array of binary digits to make the sum of all the binary digits.
C. a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors is detected.
D. the ratio of the number of data units in error to the total number of data units
E. None of the above

983. Intranets and extranets can use their network fire walls and other security features to establish secure Internet links within an enterprise or with its trading partners. Select the best fit for answer:
A. Network Server
B. Virtual Private Network
C. Network operating system

984. 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

985. 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

986. 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

987. 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

988. Bandlimited signal is
A. transmission of signals without modulation
B. a signal all of whose energy is contained within a finite frequency range
C. simultaneous transmission of data to a number of stations
D. All of the above
E. None of the above

989. Computers in a LAN can be interconnected by radio and infrared technologies.
A. Wireless LANs
B. Network Topologies
C. Multiplexer
D. Modem

990. How many digits of the Network User Address are known as the DNIC (Data Network Identification Code)?
A. first three
B. first four
C. first five
D. first seven
E. None of the above