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ENCT 304Bachelor in Computer Engineering · Semester 52 Papers Available

Computer Networks

Past examination question papers and complete curriculum syllabus for Computer Networks (ENCT 304), Bachelor in Computer Engineering Semester 5 under Institute of Engineering (IOE), Tribhuvan University.

Sem 5 Subjects (6)View Full Semester Overview →
ENSH 304Probability and StatisticsENCT 301Database Management SystemENCT 302Web Application ProgrammingENCT 303Computer Organization and ArchitectureENCT 304Computer NetworksENCT 325-344Elective I
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5th-sem_Computer Network.pdf

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Most Frequently Asked Questions

Top recurring IOE board exam questions for Computer Networks with verified mark schemes, formula notation, and recurrence frequency.

Showing 40 of 40 top repeated questions
7 Chapters · Click any chapter to expand
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Year-wise & Session-wise Exam Papers

Complete questions from each exam session (Regular & Back exams from 2082 to 2069) for Computer Networks. Click any session paper to expand.

Showing 205 questions across 16 exam session papers
Institute of Engineering • 2082 Chaitra Board Examination
Q1[2 Marks]Introduction
Compare OSI layer with TCP/IP Layer? Explain in which level of OSI layer following tasks are done. i) Error detection and correction ii) Encryption and Decryption of data iii) Logical identification of computer iv) Point-to-point connection of socket v) Dialogue control vi) Physical identification of computer
Q2[2 Marks]Physical Layer
List the benefits of twisted pair cabling. Encode the message 10101101 using Manchester coding scheme.
Q3[2 Marks]Data Link Layer
What is the main functionality of data link layer? Differentiate between circuit switching and packet switching.
Q4[2 Marks]Data Link Layer
List the difference between token bus and token ring. In random access protocol, explain how maximum efficiency of Slotted Aloha is achieved than pure Aloha.
Q5[8 Marks]Network Layer
Suppose your company has leased the IP address of 222.70.94.0/24 from your ISP. Divide it far five different departments containing 50, 30, 25, 12, 10 no of hosts. There are also two points to point links far interconnection between routers. List out the network address, broadcast address, usable IP address range and subnet mask for each subnet. Also mention the unused range of IP addresses.
Q6[2 Marks]Network Layer
What are the factors that lead to the speedy development of IPv6? Define the process of transition from IPv4 to IPv6.
Q7[6 Marks]Network Layer
Explain the principles of link state routing protocol with OSPF states.
Q8[3 Marks]Transport Layer
Why port number is used in networking? What are the services of transport layer? Differentiate between TCP and UDP protocol.
Q9[2 Marks]Upper Layers and Network Design
What is DNS and why is it required? What is the different kind of query methods used in DNS? Explain process flow of recursive query.
Q10[3 Marks]Advanced Topics
Describe basic principle of software-defined networking (SDN). What are the benefits and applications of quantum networking?
Q11[8 Marks]Network Layer
Explain any two suitable transition strategies for IPv4 to IPv6.
Q12[8 Marks]Introduction
Compare OSI with TCP/IP reference model.
Q13[8 Marks]Transport Layer
Differentiate between TCP and UDP protocol.
Q14[2 Marks]Introduction
Define protocols and standards. Compare OSI and TCP/IP model layers with suitable diagram.
Q15[2 Marks]Data Link Layer
Explain about Go-back-N ARQ and selective repeat ARQ with example. What are the services provided by the data link layer?
Q16[8 Marks]Network Layer
Using a network of 160.15.20.0/16, design a VLSM solution to accommodate 5 departments each having, 256, 16, 555, 120, and 62 hosts. List out the subnet mask, network address, broadcast address, usable host IP ranges and wasted IP addresses for each case.
Q17[3 Marks]Transport Layer
Compare TCP and UDP transport protocols. Explain TCP 3-way handshaking process.
Q18[8 Marks]Network Layer
Write short notes on: (Any Two) [2x2.5] (a) IPv4 to IPv6 network transition strategies (b) Legal and technical aspects of IP interconnection (c) MPLS

Curriculum Syllabus & Course Topics

Sourced from TU curriculum portal
Full Syllabus (PDF)Micro Syllabus (PDF)
Chapter-wise Units & Micro-Syllabus Topics (7 Units)

  1. 1. Introduction

    • 1.1Computer network, importance and applications
    • 1.2Types of computer networks
    • 1.3Network topologies
    • 1.4Client/server and P2P networks
    • 1.5Protocols and standards, need of standardization
    • 1.6Layered network architecture, OSI and TCP/IP reference models
    • 1.7Addressing at different layers
    • 1.8Networking devices: Repeater, hub, bridge, switch, router, gateway

  2. 2. Physical Layer

    • 2.1Network monitoring: Bandwidth, throughput, delay, round-trip-time
    • 2.2Multiplexing - FDM, TDM, WDM
    • 2.3Switching - circuit switching, packet switching, datagram and virtual circuit switching
    • 2.4Transmission media - Guided (twisted pair, coaxial, optical fiber) and unguided media (radio waves, microwaves, infrared)
    • 2.5Ethernet cable standards (twisted pair and optical fiber)
    • 2.6Data encoding: Manchester, NRZ-I, MLT3, 4B/5B

  3. 3. Data Link Layer

    • 3.1Data link layer functions - Framing, error control, flow control, access control
    • 3.2Error control codes: Parity, checksum, CRC
    • 3.3Data link protocols: PPP, HDLC
    • 3.4Logical link control (LLC) and media access control (MAC) sublayers
    • 3.5Random access protocols: ALOHA, CSMA, CSMA/CD, CSMA/CA
    • 3.6Token based protocols: Token bus, token ring, FDDI
    • 3.7Ethernet (IEEE 802.3) and its evolution, bridged and switched Ethernet
    • 3.8WLAN (Wi-Fi) and IEEE 802.11
    • 3.9VLAN and its importance
    • 3.10Virtual circuit switching: ATM, MPLS

  4. 4. Network Layer

    • 4.1Network layer functions and services
    • 4.2Connection oriented and connectionless network services
    • 4.3Logical addressing and its importance
    • 4.4IPv4 addressing and classes, private and public IP address, sub-netting and super-netting, VLSM, CIDR
    • 4.5Unicast, multicast and broadcast addresses
    • 4.6Routing and types of routing: Static and dynamic, unicast and multicast, interior and exterior, distance vector and link state
    • 4.7Routing protocols: RIP, OSPF, EIGRP, BGP
    • 4.8Network address translation (NAT)
    • 4.9IPv6 addressing, need and features of IPv6
    • 4.10Protocols: IPv4, ARP, ICMP, IPv6, ICMPv6
    • 4.11Transition from IPv4 to IPv6 and strategies
    • 4.12Traffic shaping and congestion control mechanisms

  5. 5. Transport Layer

    • 5.1Transport layer functions and services
    • 5.2Elements of transport layer protocols: process-to- process communication, addressing, multiplexing and de-multiplexing, segmentation and reassembly, error control, flow control
    • 5.3Transport protocols: TCP and UDP
    • 5.4TCP services: connection setup and release, reliable, stream oriented, flow-control, error-control
    • 5.5Introduction to socket and socket programming

  6. 6. Upper Layers and Network Design

    • 6.1Functions and services of session, presentation and application layers
    • 6.2Introduction to upper layer protocols: DHCP, HTTP, HTTPS, FTP, SMTP, POP, IMAP
    • 6.3DNS, its function and DNS queries
    • 6.4Network management tools and protocols (SNMP)
    • 6.5Basics of web, e-mail, DNS and proxy server configurations
    • 6.6VoIP, FoIP and IP interconnection
    • 6.7Network design and configuration guidelines

  7. 7. Advanced Topics

    • 7.1Introduction to software- defined networking (SDN), basic architecture, importance and applications
    • 7.2Network security and its importance
    • 7.3Overview of content delivery networks (CDNs), named data networking (NDN), intent based networking (IBN)
    • 7.4Quantum network, network virtualization and recent trends in networking

Examination Scheme & Marks Distribution

Evaluation Structure

  • Final Board Theory Exam: 60 Marks (Pass mark: 24)
  • Internal Assessment: 40 Marks (Pass mark: 16)
  • Practical / Lab Exam: 25 or 50 Marks (Continuous lab evaluation + viva, where applicable)

* This is the general current IOE 60/40 scheme; verify course-specific details in the syllabus above.

Exam Preparation Guidelines

  • Review the 2 available past examination papers to identify recurring patterns, core problem types, and chapter weightage.
  • Cross-reference key answers with official syllabus units, standard textbooks, and lecture notes.
  • Structure answers with labeled diagrams, concise bullet points, and highlight final answers in numerical solutions.
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Curriculum Syllabus & Marking Scheme