MCQOPTIONS
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MCQOPTIONS
This section includes 415 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
An error-detecting code inserted as a field in a block of data to be transmitted is known as |
| A. | Frame check sequence |
| B. | Error detecting code |
| C. | Checksum |
| D. | flow control |
| Answer» B. Error detecting code | |
| 102. |
Demodulation is a process of |
| A. | converting analog to digital signals |
| B. | converting digital to analog signals |
| C. | multiplexing various signals into one high speed line signals |
| D. | performing data description. |
| Answer» B. converting digital to analog signals | |
| 103. |
The size or magnitude of a voltage or current waveform is |
| A. | Amplitude |
| B. | Aloha |
| C. | Angle Modulation |
| D. | Attenuation |
| Answer» B. Aloha | |
| 104. |
Many large organizations with their offices in different countries of the world connect their computers through telecommunication satellites and telephone lines. Such a communication network is called |
| A. | LAN |
| B. | WAN |
| C. | ECONET |
| D. | EITHERNET |
| Answer» C. ECONET | |
| 105. |
Examples are packet switching using frame relay, and cell switching using ATM technologies. Select the best fit for answer: |
| A. | Bandwidth alternatives |
| B. | Switching alternating |
| C. | Inter organizational networks |
| D. | Extranets |
| Answer» C. Inter organizational networks | |
| 106. |
The X.25 standard specifies a |
| A. | technique for start-stop data |
| B. | technique for dial access |
| C. | DTE/DCE interface |
| D. | data bit rate |
| Answer» D. data bit rate | |
| 107. |
Which application allows a user to access and change remote files without actual transfer? |
| A. | TELNET |
| B. | NFS |
| C. | FTP |
| D. | DNS |
| Answer» C. FTP | |
| 108. |
Which of the following network access standard is used for connecting stations to a circuit-switched network? |
| A. | X.3 |
| B. | X.21 |
| C. | X.25 |
| D. | X.75 |
| Answer» C. X.25 | |
| 109. |
The IEEE 802 project of the 1980s involved further defining the lower two layers of the OSI model. A number of standards were agreed upon during that time. Which of the following is the standard for Ethernet? |
| A. | 802.2 |
| B. | 802.3 |
| C. | 802.4 |
| D. | 802.5 |
| Answer» C. 802.4 | |
| 110. |
Which multiplexing technique shifts each signal to a different carrier frequency? |
| A. | FDM |
| B. | synchronous TDM |
| C. | asynchronous TDM |
| D. | All of the above |
| Answer» B. synchronous TDM | |
| 111. |
Communication circuits that transmit data in both directions but not at the same time are operating in |
| A. | a simplex mode |
| B. | a half-duplex mode |
| C. | a full-duplex mode |
| D. | an asynchronous mode |
| Answer» C. a full-duplex mode | |
| 112. |
The _____ layer is the layer closest to the transmission medium. |
| A. | transport |
| B. | network |
| C. | data link |
| D. | physical |
| Answer» E. | |
| 113. |
If digital data rate of 9600 bps is encoded using 8-level phase shift keying (PSK) method, the modulation rate is |
| A. | 1200 bands |
| B. | 3200 bands |
| C. | 4800 bands |
| D. | 9600 bands |
| Answer» C. 4800 bands | |
| 114. |
Networks where end user workstations are tied to LAN servers to share resources and application processing. |
| A. | Internetworked enterprise |
| B. | Information super highway |
| C. | Business applications of telecommunications |
| D. | Client/Server networks |
| Answer» E. | |
| 115. |
On a class B network, how many hosts are available at each site with a subnet mask of 248? |
| A. | 16382 |
| B. | 8190 |
| C. | 4094 |
| D. | 2046 |
| Answer» E. | |
| 116. |
If delays are recorded as 10 bit numbers in a 50 router network, and delay vectors are exchanged twice a second, how much bandwidth per fill duplex line is occupied by the distributed routing algorithm? |
| A. | 500 bps |
| B. | 1500 bps |
| C. | 5 bps |
| D. | 1000 bps |
| Answer» E. | |
| 117. |
Which of the following items is not used in Local Area Networks (LANs)? |
| A. | Computer |
| B. | Modem |
| C. | Printer |
| D. | Cable |
| Answer» C. Printer | |
| 118. |
The term "remote job entry" relates to |
| A. | batch processing |
| B. | realtime processing |
| C. | transaction processing |
| D. | distributed processing |
| Answer» B. realtime processing | |
| 119. |
Which of the following is an example of bounded medium? |
| A. | Coaxial cable |
| B. | Wave guide |
| C. | Fiber optic cable {d) All of the above |
| D. | None of the above |
| Answer» E. | |
| 120. |
Computers in a LAN can be interconnected by radio and infrared technologies. |
| A. | Wireless LANs |
| B. | Network Topologies |
| C. | Multiplexer |
| D. | Modem |
| Answer» B. Network Topologies | |
| 121. |
Which of the following services dynamically resolves NetBIOS-to-IP resolution? |
| A. | DNS |
| B. | DHCP |
| C. | WINS |
| D. | LMHOSTS |
| Answer» D. LMHOSTS | |
| 122. |
Which of the following is not a transmission medium? |
| A. | telephone lines |
| B. | coaxial cable |
| C. | modem |
| D. | microwave systems |
| Answer» D. microwave systems | |
| 123. |
The network layer, in reference to the OSI model, provide |
| A. | data link procedures that provide for the exchange of data via frames that can be sent and received |
| B. | the interface between the X.25 network and packet mode device |
| C. | the virtual circuit interface to packet-switched service |
| D. | All of the above |
| Answer» D. All of the above | |
| 124. |
Which of the following frequency ranges is used for AM radio transmission? |
| A. | Very Low Frequency : 3 kHz to 30 kHz |
| B. | Medium Frequency : 300 kHz to 3 MHz |
| C. | High Frequency : 3 MHz to 30 MHz |
| D. | Very High Frequency : 30 MHz to 300 MHz |
| Answer» C. High Frequency : 3 MHz to 30 MHz | |
| 125. |
X.21 is |
| A. | a method of determining which device has access to the transmission medium at any time |
| B. | a method access control technique for multiple-access transmission media |
| C. | a very common bit-oriented data link protocol issued by ISO |
| D. | network access standard for connecting stations to a circuit-switched network |
| Answer» E. | |
| 126. |
Because the configuration infor-mation for a DHCP client is received dynamically, you must use which utility to read the current configuration to verify the settings? |
| A. | PING |
| B. | TRACERT |
| C. | ARP |
| D. | IPCONFIG |
| Answer» E. | |
| 127. |
What are the data transmission channels available for carrying data from one location to another? |
| A. | Narrowband |
| B. | Voiceband |
| C. | Broadband |
| D. | All of the above |
| Answer» E. | |
| 128. |
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error? |
| A. | one bit or any odd number of bits inverted in a block of data during transmission |
| B. | two bits or any even number of bits inverted in a block during transmission |
| C. | one bit or any odd number of bits inverted in a byte during transmission |
| D. | two bits or any even number of bits inverted in a byte during transmission |
| Answer» E. | |
| 129. |
The OCR reading unit attached to a POS terminal is called a |
| A. | light pen |
| B. | wand |
| C. | cursor |
| D. | All of the above |
| Answer» C. cursor | |
| 130. |
What is the first octet range for a class B IP address? |
| A. | 128 - 255 |
| B. | 1 - 127 |
| C. | 192 - 223 |
| D. | 128 - 191 |
| Answer» E. | |
| 131. |
An error detecting code is which code is the remainder resulting from dividing the bits to be checked by a predetermined binary number, is known as |
| A. | Cyclic redundancy check |
| B. | Checksum |
| C. | Error detecting code |
| D. | Error rate |
| Answer» B. Checksum | |
| 132. |
The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide? |
| A. | A logical address that identifies the workstation |
| B. | A physical address that is randomly assigned each time the computer is started |
| C. | A physical address that is assigned by the manufacturer |
| D. | The logical domain address for the workstation |
| Answer» D. The logical domain address for the workstation | |
| 133. |
What is the name of the device that converts computer output into a form that can be transmitted over a telephone line? |
| A. | Teleport |
| B. | Modem |
| C. | Multiplexer |
| D. | Concentrator |
| Answer» C. Multiplexer | |
| 134. |
IEEE project 802 divides the data link layer into an upper _____ sublayer and a lower _____ sublayer. |
| A. | HDLC, PDU |
| B. | PDU, HDLC |
| C. | MAC, LLC |
| D. | LLC, MAC |
| Answer» E. | |
| 135. |
An encyclopedic database |
| A. | is an information utility that specializes in storing and searching information |
| B. | is generally free |
| C. | is easy for beginners to use |
| D. | All of the above |
| Answer» B. is generally free | |
| 136. |
You have a network ID of 192.168.10.0 and require at least 25 host IDs for each subnet, with the largest amount of subnets available. Which subnet mask should you assign? |
| A. | 255.255.255.192 |
| B. | 255.255.255.224 |
| C. | 255.255.255.240 |
| D. | 255.255.255.248 |
| Answer» C. 255.255.255.240 | |
| 137. |
The dialogue techniques for terminal use do not include |
| A. | questions and answers |
| B. | open-ended questions |
| C. | form fillings |
| D. | menu display |
| Answer» C. form fillings | |
| 138. |
A characteristic of a multiprogramming system is: |
| A. | simultaneous execution of program instructions from two applications |
| B. | concurrent processing of two or more programs |
| C. | multiple CPUs |
| D. | All the above |
| Answer» C. multiple CPUs | |
| 139. |
The data-link layer, in reference to the OSI model, specifies |
| A. | data link procedures that provide for the exchange of data via frames that can be sent and received |
| B. | the interface between the X.25 network and packet mode device |
| C. | the virtual circuit interface to packet-switched service |
| D. | All of the above |
| Answer» B. the interface between the X.25 network and packet mode device | |
| 140. |
Four routers have to be interconnected in a point-to-point Network. Each pair of root us may connected by a high-speed line, a medium speed line or a low speed line. Find the total number of topologies. |
| A. | 12 |
| B. | 81 |
| C. | 48 |
| D. | 729 |
| Answer» E. | |
| 141. |
A network which is used for sharing data, software and hardware among several users owning microcomputers is called |
| A. | WAN |
| B. | MAN |
| C. | LAN |
| D. | VAN |
| Answer» D. VAN | |
| 142. |
A T-switch is used to |
| A. | control how messages are passed between computers |
| B. | echo every character that is received |
| C. | transmit characters one at a time |
| D. | rearrange the connections between computing equipment |
| Answer» E. | |
| 143. |
Synchronous protocols |
| A. | transmit characters one at a time |
| B. | allow faster transmission than asynchronous protocols do |
| C. | are generally used by personal computers |
| D. | are more reliable |
| Answer» C. are generally used by personal computers | |
| 144. |
Which of the following TCP/IP internet protocol a diskless machine uses to obtain its IP address from a server? |
| A. | RDP |
| B. | RARP |
| C. | RIP |
| D. | X.25 |
| Answer» C. RIP | |
| 145. |
Data link layer retransmits the damaged frames in most networks. If the probability of a frame's being damaged is p, what is the mean number of transmissions required to send a frame if acknowledgements are never lost. |
| A. | P I (K + 1) |
| B. | KIK (1 + F) |
| C. | 1/ (1 - F) |
| D. | K I (K - P) |
| Answer» D. K I (K - P) | |
| 146. |
The most flexibility in how devices are wired together is provided by |
| A. | bus networks |
| B. | ring networks |
| C. | star networks |
| D. | T-switched networks |
| Answer» B. ring networks | |
| 147. |
Data are sent over pin _____ of the EIA-232 interface. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | All of the above |
| Answer» B. 3 | |
| 148. |
You are working with a network that has the network ID 10.9.0.0 and contains 73 networks. In the next year, you will be adding an additional 27 branch offices to your company. For simplified management, you want to keep the most possible hosts per subnet. Which subnet mask should you management, you want to keep the most possible hosts per subnet. Which subnet mask should you use? |
| A. | 255.224.0.0 |
| B. | 255.240.0.0 |
| C. | 255.248.0.0 |
| D. | 255.252.0.0 |
| Answer» E. | |
| 149. |
Packet Switch Stream (PSS) was introduced in |
| A. | the US in 1961 (&) the UK in 1981 |
| B. | the UK in 1980 |
| C. | the US in 1961 |
| D. | None of the above |
| Answer» C. the US in 1961 | |
| 150. |
How many OSI layers are covered in the X.25 standard? |
| A. | two |
| B. | three |
| C. | seven |
| D. | six |
| Answer» C. seven | |