Bangladesh Civil Service Preliminary Examination · General Science and Information & Communication Technology

Computer Systems, Networking and ICT

35 practice questions, each with the answer and an explanation.

Practise Computer Systems, Networking and ICT now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 35 questions

  1. Which internal CPU register holds the memory address of the next machine instruction to be fetched and executed by the processor?
  2. Which type of computer memory provides the fastest read and write access times directly to the arithmetic logic unit?
  3. How many distinct memory addresses can be uniquely referenced by a microprocessor with a 32-bit address bus?
  4. What is the hexadecimal equivalent of the 8-bit binary number 11011010_2?
  5. Which logic gate outputs a binary 1 if and only if its two binary inputs are unequal (one is 1 and the other is 0)?
  6. Which two digital logic gates are considered universal gates because any combinational circuit can be constructed solely using either of them?
  7. What is the core component of an operating system that maintains complete control over hardware resources, device drivers, and system memory?
  8. Which CPU scheduling algorithm assigns a fixed time slice (quantum) sequentially to each runnable process in the ready queue?
  9. In local area network architecture, which topology connects all network nodes directly to a central hub or switch?
  10. How many functional layers are defined in the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) reference model?
  11. At which layer of the OSI model do network routers operate to inspect IP destination addresses and forward packets across subnets?
  12. Which transport layer protocol provides connection-oriented, reliable, in-order byte stream delivery with end-to-end flow and congestion control?
  13. What is the standard length in bits of an Internet Protocol version 4 (IPv4) address?
  14. What is the total address length in bits of an Internet Protocol version 6 (IPv6) address?
  15. Which default transmission port number is reserved for standard unencrypted Hypertext Transfer Protocol (HTTP) web communications?
  16. Which protocol dynamically translates human-friendly alphanumeric domain names into numerical IP addresses across the Internet?
  17. Which network protocol automatically assigns dynamic IP addresses, default gateways, and subnet masks to host devices connecting to a network?
  18. In relational database design, what is an attribute or set of attributes that uniquely identifies every tuple in a table without containing null values?
  19. Which relational database constraint enforces referential integrity by linking a column in one table to the primary key of another table?
  20. Which SQL clause is used to eliminate duplicate rows from the result set of a database query?
  21. What do the letters in the ACID acronym stand for regarding reliable transaction processing in database management systems?
  22. Which cryptographic mechanism uses a pair of mathematically linked public and private keys to secure communications?
  23. Which public-key cryptographic algorithm is based on the mathematical difficulty of factoring the product of two large prime numbers?
  24. What is the fixed output digest length produced by the secure cryptographic hash algorithm SHA-256?
  25. Which security device or software filter inspects incoming and outgoing network traffic against defined security rules to block unauthorized access?
  26. What type of social engineering cyberattack deceives individuals into revealing sensitive credentials by masquerading as a trustworthy entity in electronic communications?
  27. Which malicious software category encrypts a victim's files and demands payment in cryptocurrency in exchange for the decryption key?
  28. In cloud computing service models, which category provides virtualized computing infrastructure such as virtual servers, network switches, and block storage?
  29. What operating system memory management technique uses secondary disk storage space to simulate additional physical RAM for running applications?
  30. What is the primary difference between an interpreter and a compiler in programming language execution?
  31. Which open-source software license created by the Free Software Foundation is a strong copyleft license requiring derivative works to be released under identical terms?
  32. Which physical transmission principle allows light signals to travel long distances through optical fiber cables without leaking through the cladding?
  33. What is the primary function of the Cache memory located between the central processing unit and main system RAM?
  34. Which standard relational database normalization stage eliminates partial functional dependencies on candidate keys, requiring every non-prime attribute to be fully functionally dependent on the prima…
  35. Which asymmetric cryptographic algorithm is specifically designed to allow two parties to establish a shared secret key over an insecure communication channel without prior authentication?

Keep practising

More Bangladesh Civil Service Preliminary Examination topics

All Bangladesh Civil Service Preliminary Examination practice →

Ready for the full Bangladesh Civil Service Preliminary Examination test?

Take a mock testBangladesh Civil Service Preliminary Examination hub