💻 Computing Solved MCQs with Answers

Practice 1954 approved 💻 Computing questions with verified answers from the 💾 Computer Science subject for Pakistan exams.

1954 solved MCQs

Which of the following flip-flops is free from race around problem?Answer: master slave JK flip-flop A NOR gate has two or more input signals. All input must be _____ to get a high outputAnswer: low How many digits of the DNIC (Data Network Identification Code) identify the country?Answer: first three A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?Answer: hot potato routing The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal toAnswer: 0.009 Frames from one LAN can be transmitted to another LAN via the deviceAnswer: Bridge Which of the following condition is used to transmit two packets over a medium at the same time?Answer: Collision You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?Answer: 255.254.0.0 What are the most commonly used transmission speeds in BPS used in data communication?Answer: 9600 What is the default subnet mask for a class C network?Answer: 255.255.255.0 Which of the following is used for modulation and demodulation?Answer: modem Which of the following is not a disadvantage of wireless LAN?Answer: All of the above The Internet Control Message Protocol (ICMP)Answer: All of the above Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing plant in the suburbs. To enable everyone to share data and resources between the two LANs, what type of device(s) are needed to connect them? Choose the most correct answer.Answer: Router The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiverAnswer: can receive and send data simultaneously How many hosts are attached to each of the local area networks at your site?Answer: 254 Which of the following technique is used for fragment?Answer: 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 Contention isAnswer: the condition when two or more stations attempt to use the same channel at the same time Avalanche photodiode receivers can detect hits of transmitted data by receivingAnswer: 200 photons Satellite-Switched Time-Division Multiple Access (SS/TDMA) isAnswer: a form of TDMA in which circuit switching is used to dynamically change the channel assignments When you ping the loopback address, a packet is sent where?Answer: Down through the layers of the IP architecture and then up the layers again Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another?Answer: SMTP Which of the following device is used to connect two systems, especially if the systems use different protocols?Answer: gateway The synchronous modems are more costly than the asynchronous modems becauseAnswer: they contain clock recovery circuits A distributed network configuration in which all data/information pass through a central computer isAnswer: star network Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?Answer: UDP A remote batch-processing operation in which data is solely input to a central computer would require a:Answer: All the above ICMP (Internet Control Message Protocol) isAnswer: a protocol that handles error and control messages If you get both local and remote echoes, every character you type will appear on the screenAnswer: twice What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?Answer: 192.168.10