Repeated PSC Questions on Computer Networks

This post is a compilation of frequently asked PSC questions on the Computer-based topic, 'Computer Networks,' from past years.

Previous Year Repeated PSC Questions on  Computer Networks

  • The environment in which communication over computer network occurs is called – Cyber space. (Junior Instructor Computer Operator and Programming Assistant, 2019)
  • The speed of computers in measured in terms of – MIPS. (Junior Instructor Computer Operator and Programming Assistant, 2019)
  • The speed of data transmission on the internet is measured in – bits per second. (University Assistant, 2019)
  • The amount of data that can be transferred per unit of time is known as – Bandwidth. (Special Branch Assistant Police, 2013)
    • What is the meaning of Bandwidth in a Network? Transmission capacity of communication channels. (Data Entry Operator (Scheduled Tribe Development) 2013)
    • The amount of data that can be sent over a specific connection in a given amount of time is – Bandwidth. (Tradesman (Computer Engineering), 2016)
  • Which network cable has the highest transmission speed in a network? Optical fiber.  (Junior Instructor Computer Operator and Programming Assistant, 2019)
    • ____________ cable has greater transmission capacity – Optical fiber.  (Instrument Mechanic, 2023)
  • In fiber optic cable, data is transferred in the form of – Light. (Data Entry Operator (Scheduled Tribe Development) 2013)
    • In optical fibre, the information travels in the form of – Light. (Telephone Operator (Degree Level Main Exam), 2023)
  • Basic working principle of Fiber Optics  Total internal reflection. (Data Entry Operator (Scheduled Tribe Development) 2013)
    • In a fibre optic cable, the signal is propagated along the inner core by – Reflection. (Workshop Instructor / Demonstrator / Instructor Gr.II (CSE), 2023)
    • The principle Total Internal reflection used in which one of the communication medium?  (Junior Instructor (Computer Hardware & Network Maintenance), 2023)
    • (A) Coaxial Cable    (B) OFC Cable   (C) UTP Cable   (D) None
  • Which of the following telecommunication medium is having the lowest
    loss? (Telephone Operator (Degree Level Main Exam), 2023)
    • (A) Coaxial Cable    (B) Jelly filled copper cable   (C) Optical fibre cable   (D) Cat 4 cable
  • Which category of Ethernet cable is suitable only for voice communication? CAT 1. (Programmer cum Operator2023)
  • ISDN stands for –  Integrated Services Digital Network. (Administrative Officer, KSRTC 2015)
  • In internet, private addresses are never routed between carriers. The usage of private addresses is specified in – RFC 1918. (Sub Inspector (Trainee), 2023)
  • ADSL stands for – Asymmetric Digital Subscriber Line. (Junior Instructor (Computer Hardware and Network Maintenance), 2019)
  • Which is used as a abbreviation to DSL Service in general? xDSL. (ICDS Supervisor, 2017)
  • Which of the following is not a internet access method?  (Accountant, 2014)
    • (A) DSL      (B) Dial Up      (C) Podcast     (D) Cable
  • Global System for Mobile (GSM) is a globally accepted standard for digital cellular
    communication that is created first time in which generations of mobile communication  (Assistant/ Jr. Clerk/ Jr. Assistant/LD Clerk etc, 2021)
    (A) First Generation networks          (B) Second Generation networks
    (C) Third Generation networks         (D) Fourth Generation networks

Types of Computer Networks

LAN (Local Area Network)

  • A network of computers and other devices that is confined to a relatively small space is called – LAN. (Tracer -Soil Survey and Soil Conservation, 2019)
    • ഒരു കെട്ടിടത്തിന്റെയോ, ഓഫീസിന്റെയോ ഉള്ളിലുള്ള കമ്പ്യൂട്ടറുകളെ തമ്മിൽ പരസ്പരം ബന്ധിപ്പിക്കുന്ന നെറ്റ് വർക്കാണ്LAN.  (ICDS Supervisor, 2021)
    • __________ is a private computer network owned by a company or an organization and is accessible only to its employees – Local Area Network. (Special Branch Assistant Police, 2013)
    • A group of interconnected computers that allow several people at the same business site to access the same set of documents – LAN. (Lecturer in Printing Technology2023)
  • LAN is useful for small distance communication – Upto 5 kms. (Instrument Mechanic, 2023)
  • An important characteristic of LAN is – Application independent interfaces. (Deputy Manager2023)
  • A topology that is responsible for describing the geometric arrangement of components that make up the LAN – Physical.  (Workshop Instructor / Demonstrator / Instructor Gr.II (CSE), 2023)
  • Which one of the following represent to the Virtual LAN (VLAN) from IEEE 802 project? (Jr Instructor (Computer Hardware & Network Maintenance), 2023)
    • (A) IEEE 802 1Q           (B) IEEE 802 1M
    • (C) IEEE 802 1N           (D) IEEE 802 1V 

MAN (Metropolitan Area Network)

  •  In the following statements which is correct in networking:  (State Tax Officer 2023)
    • (A) In LAN the congestion in the network is very low than MAN 
    • (B) In MAN exhibits higher network congestion than LAN 
    • (C) In WAN it exhibits a higher congestion in the network than MAN 
    • (D) All of the above 
  • MAN-ന്റെ പൂർണ രൂപം – Metropolitan Area Network. (Assistant Salesman, 2021)
  • കേബിൾ ടി.വി. ശൃംഖല ഏതുതരം നെറ്റ്‌വർക്കിന്‌ ഉദാഹരണമാണ്  – മെട്രോപൊളിറ്റൻ ഏരിയ നെറ്റ്‌വർക്ക്. (Village Extension Officer, 2021)
    • Which type of network is used in Cable Television Network? MAN. (Station Officer(Trainee), 2023)

WAN (Wide Area Network)

  • Internet is a – WAN.  (Clerk Typist/Typist Clerk, 2021).
    • Internet is an example of – WAN.  (Reporter Grade II (Malayalam), 2023)
  • Telecommunication network usually used for connecting computers through public networks such as telephone, leased lines or satellites, is – WAN.  (Copy Holder, 2023)
  • റെയിൽവേ റിസർവേഷൻ സിസ്റ്റം ഏത് നെറ്റ് വർക്കിന്‌ ഉദാഹരണമാണ്? WAN.  (LDC/Sergeant, 2023)
  • _______ is a term used for a practice where people travel around the city with a specialized device, searching for unprotected WLAN – Hotspots.  (ICDS Supervisor, 2017)

PAN (Personal Area Network)

  • The computer network that connects computers/devices within the range of an individual person, that provides a network range within a person’s range typically within a range of 10 meters – PAN. (Junior Instructor (Computer Hardware & Network Maintenance), 2023)


  • The IEEE standard for wireless LAN is – 802.11.  (Accountant, 2014)
  • The minimum and maximum frame length of IEEE 802 LAN in bytes – 64 and 1518. (Workshop Instructor / Demonstrator / Instructor Gr.II (CSE), 2023)
  • FireWire is another name for the __ interface – IEEE 1394. (ICDS Supervisor, 2017)
  • __ is a term used for a practice where people travel around the city with a specialized device, searching for unprotected WLAN – Hotspots. (ICDS Supervisor, 2017)
  • WPA2 is used for security in – wi-fi.  (Dairy Farm Instructor, 2020)
  • Which IT communication technology is frequently used for contactless payments and keyless entry systems and allows the exchange of data between devices over short distances? Near Field Communication. (Junior Instructor (Multimedia Animation & Special Effects)2023)


  • Bluetooth is a – wireless network.  (Accountant, 2014)
  • Bluetooth is a technology using – High Frequency Radio waves. (Assistant Grade-II, Kerala Veterinary University 2014)
    • Bluetooth technology uses ____ signals for data transmission – Radio waves. (Assistant Information Officer, 2017)
    • ഏത് തരംഗങ്ങളാണ് ബ്ലൂടൂത്ത് സംവിധാനത്തിൽ ഉപയോഗിക്കുന്നത്? റേഡിയോ തരംഗം. (Village Field Assistant, Cobbler etc (SSLC Level Main Exam 2022), 2023)
  • For pairing Bluetooth devices, it needs – Passcode.  (Junior Instructor (Computer Operator & Programming Assistant), 2023)
  • Maximum number of devices connected to Bluetooth – 8.  (Junior Instructor (Computer Operator & Programming Assistant), 2023)
    • What is the maximum number of slave devices that can be supported in a Bluetooth network? 7. (Programmer cum Operator2023)
  • Consider the following features of Bluetooth Connectivity –  (Junior Project Assistant, 2023)
    • a.  It is long range wireless technology used for exchange of data
    • b.  It work within the range of 0-400 m.
    • c.  International Agency for cancer has listed  Bluetooth transmission in the carcinogen list.
    • (A) b only    (B) a and b   (C) b and c   (D) All of the above
  • Which among the following features of your phone can be used to share Internet from your phone? (Clerk cum Typist (Degree Level Main Exam)2023)
    • (A) Bluetooth                         (B) Wi-Fi
    • (C) WiMAX                           (D) None of the above

CAN (Controller Area Network)

  • The ____________ Network is serial communication protocol suited for networking sensors, actuators and other electronic devices in vehicles – CAN.  (Lecturer in Automobile Engineering2023)
  • How many bits in standard CAN Base Frame format? 11 bits identifier. (Lecturer in Automobile Engineering2023)

Statement Questions

  • Consider the following statements:   (Cashier/Field Officer, 2023)
    • (i) LAN is connected through wire transmission only. 
    • (ii) Internet is considered as a MAN. 
    • (iii) WAN has the highest speed network than other network connections. 
    • Which among the above statements is / are correct? 
      • (A) (i) only           (B) (i) and (iii)           (C) (ii) and (iii)        (D) none of the above 

Computer Network Topologies

  • The way in which the nodes are physically interconnected to form a network is called – Topology. (Tradesman (Computer Engineering), 2016) 
    • In computer networks, the term used to explain how a network is physically connected and the logical flow of information in the network – Topology. (Lecturer in Printing Technology, 2023)
  • Which of the following ISO-OSI layer which defines Topology in computer network?(Junior Instructor (Computer Hardware & Network Maintenance), 2023)
    • (A) Physical Layer   (B) Data Link Layer   (C) Transport Layer    (D) Network Layer 
  • താഴെ കൊടുത്തിരിക്കുന്ന ഓപ്ഷനുകളിൽ നിന്ന് ഇന്റർനെറ്റിലെ സേവനങ്ങൾ അല്ലാത്തത് തിരഞ്ഞെടുക്കുക  (SSLC Main Exam (Office Attendant, Laboratory Attender, etc) 2021
    • (A) ഇമെയിൽ   (B) ഡബ്ല്യു. ഡബ്ല്യു. ഡബ്ല്യു.  (C) ടോപ്പോളജി    (D) സെർച്ച് എഞ്ചിനുകൾ


  • The topology with the highest reliability – Mesh. (Laboratory Technical Assistant Computer Application, 2017) 
  • Which one of the following is a Topology in computer network?  (Junior Instructor (Computer Hardware & Network Maintenance), 2023)
    • (A) Hub   (B) Switch  (C) Mesh   (D) Router


  • In which topology there is a central controller? Star(Jr Instructor Computer Operator and Programming Assistant, 2019)
  • In which network topology has a central node connected to each node? Star(Instrument Mechanic, 2023)
    • ഉപകരണങ്ങൾ പരസ്പരം ബന്ധിപ്പിക്കാത്തതും, ഹബ് ഒരു കേന്ദ്ര കൺട്രോളറായി പ്രവർത്തിക്കുന്നതുമായ നെറ്റ്‌വർക്ക് ടോപ്പോളജി ആണ്  – സ്റ്റാർ. (Degree Level Mains Stage II, 2021)


  • Device that helps prevent congestion and data collisions  Switch.  (Range Forest Officer (By Transfer) Prelims, 2023)


  • The device used to connect computers of the same network in a wired connection – Hub. (Tradesman (Computer Engineering), 2016)
  • Which of the following statements is/are false? (Degree Prelims Stage III, 2023)
  • (i) Hub operates on data link layer while switch operates on physical layer.
  • (ii) Hub is broadcast type transmission. 
  • (iii) Router operates on network layer.
  • (A) (i) only     (B) (i) and (ii)         (C) (i), (ii) and (iii)      (D) (ii) and (iii)

  • Which network topology can be expanded easily? Hybrid. (Junior Instructor Computer Operator and Programming Assistant, 2019)
  • Match the following       (Project Assistant/ Unit Manager,  2023)
  • i.  Bridge                         a.   Connects two different LAN working on same protocol
  • ii. Gateway                     b.  Connects two different networks works on different protocols  
  • iii. Modem                      c.  Connects different devices to a network and make them communicate each other
  • iv. Router                        d.   Connect the devices to Internet
    • Choose the correct option from the following
      • (A) i-a, ii-b, iii-d, iv-c
      • (B) i-b, ii-c, iii-d, iv-a
      • (C) i-a, ii-d, iii-b, iv-c
      • (D) i-b, ii-d, iii-c, iv-a

Network Devices

  • Portable device for high-speed internet connection – Dongle.  (Clerk cum Typist (Degree Level Main Exam), 2023)


  • Modem was invented in – USA, 1950. (Deputy Manager, 2023)
  • Modem stands for – Modulator Demodulator. (Instructor In Secretarial Practice, 2017)
  • ………….enables computers to communicate via telephone line – Modem (Data Entry Operator (Scheduled Tribe Development) 2013;  Assistant Salesman, 2021)
  • What are the functions of MODEM? (Junior Instructor (Computer Operator & Programming Assistant), 2023)
    • (i) Analog Signal to Digital Signal
    • (ii) Digital Signal to Analog Signal
    • (iii) Analog Signal to Analog Signal
    • (iv) Digital Signal to Digital Signal
    • (A) Both (i) & (ii)         (B) (i) Only        (C) (iii) Only      (D) Both (iv) & (iii)
  • The device used to convert digital signal to analog is called – Modem (Tradesman (Computer Engineering), 2016)
    • A device that modulates signals to encode digital information and demodulates signals to decode the transmitted information – Modem (Assistant - Universities in Kerala, 2016)
    • The network device that both modulates and demodulates analog carrier signals for encoding and decoding digital information for Transmitting and Receiving –  Modem(Junior Instructor (Computer Hardware & Network Maintenance), 2023)

NIC (Network Interface Devices)

  • The hardware component in the computer on a network which controls the flow of data regardless of wireless and topology used is – NIC.  (Degree Level Prelims, Stage I, 2021)


  • The device that is used to connect two different networks is called ____ – Gateway.  (Time Keeper (Degree Level Main Examination 2022), 2023)
  • A _________ is a passage to connect two networks together that may work upon different networking models – Gateway.  (Station Officer(Trainee), 2023)
  • Network device to translate one protocol into the other protocol is –  Gateway.  (Junior Instructor (Computer Operator & Programming Assistant), 2023)
    • ____________ is a device that connects networks with different protocols – Gateway.  (Higher Secondary School Teacher (Junior) Computer Science, 2023)
    • Which one of the following is a protocol convertor which used to connect two systems, specifically if the systems use different protocols? (Junior Instructor (Computer Hardware & Network Maintenance), 2023)
      • (A) Modem   (B) Gateway   (C) Switch   (D) Router
  •  _______ device can join a LAN to a WAN – Gateway.  (Degree Level Prelims Stage II, 2023)
  • വിവിധ തരത്തിലും പ്രോട്ടോക്കോളിലും പ്രവർത്തിക്കുന്ന കമ്പ്യൂട്ടർ ശൃഖലകളെ ബന്ധിപ്പിക്കാൻ ______ ഉപയോഗിക്കുന്നു  – ഗേറ്റ് വേ.   (Junior Assistant, 2023)
  • താഴെ പറയുന്ന നെറ്റ്‌വർക്ക് ഉപകരണങ്ങളിൽ പ്രോട്ടോകോൾ പരിവർത്തനത്തിനു കഴിവുള്ളത് ആർക്കു (LD Clerk, 2021)
    • (A) റിപീറ്റർ   (B) ബ്രിഡ്ജ്   (C) റൗട്ടർ   (D) ഗേറ്റ് വേ


  • The device that can interconnect two networks of the same type using the same protocol. The above-mentioned device is – Router.  (Cashier/Field Officer, 2023)
  • Router works at the _____ layer of the OSI model – 3rd. (Junior Instructor (Data Entry Operator), 2014)
  • Which of the following is not a switching system ?  (Catalogue Assistant 2023)
    • (A) Packet  (B) Circuit   (C) Router   (D) Message
  • One of the following device works on the physical, data-link and network layer of the OSI model: (State Tax Officer 2023)
    • (A) Hub   (B) Router   (C) Bridge   (D) Switch 

Thanks for reading!!!