Computer Network Exam 2021-2022
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Category 5e UTP cable is most often used in which type of network?

  • Wireless
  • Telephone
  • Ethernet (correct)
  • Satellite

    • What is the maximum end-to-end cable length of a single UTP cable that is sufficient for data communication?

  • 60m
  • 120m
  • 100m (correct)
  • 150m

    • What is the maximum end-to-end cable length of a single coaxial cable for data communication?

  • 400m
  • 600m
  • 300m
  • 500m (correct)

    • Which type of cable is not affected by electromagnetic interference?

    <p>Fiber optic cable</p> Signup and view all the answers

    Which physical phenomenon is utilized in optical fiber transmission?

    <p>Total internal reflection</p> Signup and view all the answers

    Which type of cable is typically used for cable television?

    <p>Coaxial cable</p> Signup and view all the answers

    Which device is used for increasing the power of a signal and retransmitting it?

    <p>Repeater</p> Signup and view all the answers

    What is a TCP name for a transport service access point?

    <p>Port</p> Signup and view all the answers

    What is the use of extended address in frame relay networks?

    <p>To increase the range of data link connection identifiers</p> Signup and view all the answers

    What is the term for an attempt to make a computer resource unavailable to its intended users?

    <p>Denial-of-service attack</p> Signup and view all the answers

    Which protocol provides a reliable communication service?

    <p>TCP</p> Signup and view all the answers

    What does the port number in a TCP connection specify?

    <p>It specifies the communication process on the two end systems</p> Signup and view all the answers

    What is the original data extracted from the data frame containing the bit sequence: 00001111 00111111 00001111 01111110 using flag bytes?

    <p>00001111 00111111 01111110</p> Signup and view all the answers

    Using a single bit parity scheme with odd code, what is the correct transmitted bit sequence for the original data: 011000101111?

    <p>0110001011110</p> Signup and view all the answers

    When using a single bit parity scheme with even code, what is the resulting bit sequence from the original data 011000101111?

    <p>0110001011111</p> Signup and view all the answers

    For the original data 11011011000101111, which bit sequence will be transmitted using a single bit parity scheme with odd code?

    <p>110110110001011110</p> Signup and view all the answers

    What is the original data determined from the received bit sequence 0110001011110 using an odd parity scheme?

    <p>011000101111</p> Signup and view all the answers

    When receiving a bit sequence of 0110001011111, what is the original data when processed with an even parity scheme?

    <p>011000101111</p> Signup and view all the answers

    What is the original data extracted from the sequence 11010011000101111 using an even parity scheme?

    <p>1101001100010111</p> Signup and view all the answers

    In a byte-stuffed framing technique, what byte serves as the ESC byte?

    <p>00001111</p> Signup and view all the answers

    Given the bit sequence 00001111 00111111 00001111, what is the first step in using flag bytes with byte stuffing for framing?

    <p>Identify and remove the FLAG byte.</p> Signup and view all the answers

    What is the main purpose of applying the Cyclic Redundancy Check (CRC) technique?

    <p>To detect errors in data transmission.</p> Signup and view all the answers

    Which protocol is specifically tasked with converting IP addresses into MAC addresses?

    <p>ARP</p> Signup and view all the answers

    Which device operates by forwarding data primarily based on the destination MAC address?

    <p>Switch</p> Signup and view all the answers

    Which of the following is a notable feature of a network switch?

    <p>It combines both plug-and-play and self-learning capabilities.</p> Signup and view all the answers

    Which method is often utilized for managing multiple accesses in computer networks?

    <p>Random access</p> Signup and view all the answers

    What is the name of the random access protocol used in the MAC layer of a computer network?

    <p>Aloha</p> Signup and view all the answers

    Which statement is correct regarding the Slotted ALOHA protocol?

    <p>Time is segmented into slots, with transmissions starting at the beginning of each slot.</p> Signup and view all the answers

    What is the primary function of a router in a network?

    <p>Routing data packets between networks.</p> Signup and view all the answers

    Which of the following describes the use of token passing in network access control?

    <p>Access is granted only when a token is passed to a device.</p> Signup and view all the answers

    What characteristic of a hub differentiates it from a switch in terms of data forwarding?

    <p>A hub does not analyze the data packets it forwards.</p> Signup and view all the answers

    Which of the following statements is true for the ALOHA protocol?

    <p>Time is divided into equal size slots and nodes immediately transmit data once it has.</p> Signup and view all the answers

    Which of the following represents the correct order of transmission efficiency for ALOHA, Slotted ALOHA, and CSMA protocols?

    <p>ALOHA – Slotted ALOHA – CSMA</p> Signup and view all the answers

    Which random access protocol is applied by Ethernet?

    <p>CSMA/CD</p> Signup and view all the answers

    Which random access protocol is applied by Wi-Fi?

    <p>CSMA/CA</p> Signup and view all the answers

    Which network applies the mechanism that allows nodes to transmit data immediately when the medium is idle for a period greater than a Distributed InterFrame Space (DIFS)?

    <p>Wi-Fi</p> Signup and view all the answers

    What is the standard size of a MAC address?

    <p>48 bits</p> Signup and view all the answers

    Which of the following addresses is considered a MAC address?

    <p>00:1A:2B:3C:4D:5E</p> Signup and view all the answers

    What is the main disadvantage of the ALOHA protocol when compared to Slotted ALOHA?

    <p>Lower maximum throughput</p> Signup and view all the answers

    What happens when two nodes transmit data at the same time in the ALOHA protocol?

    <p>The transmissions collide and both are lost.</p> Signup and view all the answers

    In terms of collision handling, which protocol works better than ALOHA?

    <p>CSMA</p> Signup and view all the answers

    Study Notes

    Computer Network Exam 2021-2022

    • Exam administered by Vietnam-Korea University of Information Technology
    • Exam duration: 60 minutes
    • Exam code: VKU-MMT-2021

    Exam Questions

    • Computer Network Definition:
      • A collection of hardware components and computers interconnected by communication channels.
      • Enables resource sharing and information exchange.
      • Includes all interconnected resources.
    • First Computer Network:
      • ARPANET
    • OSI Model Layers:
      • 7 layers in the OSI model
    • Host-to-Host Layers in OSI Model:
      • Transport, Session, Presentation, and Application Layers
    • TCP/IP Model Layers:
      • 4 layers
    • Wide Area Network (WAN):
      • A network that spans a large geographical area, such as a country or the world.
    • Local Area Network (LAN):
      • A network covering a limited geographical area, such as a building or a campus.
    • OSI Model Layer for Syntax and Semantics:
      • Presentation layer
    • OSI Model Layer for Packet Routing:
      • Network layer
    • OSI Model Layers Corresponding to Application Layer in TCP/IP:
      • Session, Presentation, and Application Layers
    • Ping Command Use:
      • To test device reachability on a network
    • Command for Managing IP Addresses on Machine:
      • Ipconfig
    • Data Unit in Physical Layer:
      • Bit
    • Layer Corresponding to Internet Layer in TCP/IP:
      • Network layer
    • UTP Cable Pair Count:
      • 4 pairs
    • Purpose of Twisting Wires in Twisted Pair Cable:
      • Reduce cross-talk interference
    • Category 5e UTP Cable Use:
      • Ethernet network
    • Maximum UTP Cable Length:
      • 100 meters
    • Maximum Coaxial Cable Length:
      • 500 meters
    • Maximum Fiber Optic Cable Length:
      • 2 kilometers
    • Cable Not Affected by Electromagnetic Interference:
      • Fiber optic cable
    • Physical Phenomenon in Optical Fiber Transmission:
      • Total internal reflection
    • Cable Used for Connecting Computers Directly:
      • Straight-through cable
    • Color Code Standard for T568A:
      • White/Green, Green, White/Orange, Blue, White/Blue, Orange, White/Brown, Brown
    • Metric for Measuring Data Transferring Speed:
      • bits per second (bps), megabits per second (Mbps), gigabits per second (Gbps), and terabits per second (Tbps)
    • Meaning of bps:
      • bits per second
    • OSI Layer Controlling Transmission Errors:
      • Data Link layer
    • Data Unit in Data Link Layer:
      • Frame
    • Number of Bits in MAC Address:
      • 48 bits
    • Physical Address:
      • 0F-1F-2F-3F-4F-5F
    • Unique Identifier for Network Interface Controller:
      • MAC address
    • Protocol for Resolving IP Address to MAC Address:
      • Address Resolution Protocol (ARP)
    • Device Forwarding Data Based on Destination MAC Address:
      • Switch
    • Characteristic of Switch:
      • Plug-and-play and self-learning
    • Method for Controlling Multiple Access in Network:
      • Random access
    • Random Access Protocol for MAC Layer:
      • ALOHA
    • Random Access Protocol for Wi-Fi:
      • CSMA/CA
    • Statement True for Slotted ALOHA:
      • Time is divided into equal size slots and nodes transmit data at start of each slot
    • Statement True for ALOHA:
      • Time is not divided into equal size slots
    • Mechanism for Controlling Medium Access in Network:
      • Time is divided into slots
    • Protocols Capable of Detecting and Correcting Single-Bit Error:
      • Two-dimensional parity scheme
    • Bit Pattern from CRC-12 Standard:
      • 1100000001111
    • Bit Pattern from CRC-16 Standard:
      • 11000000000000101
    • Bit Pattern from CRC-CCITT Standard:
      • 10001000000100001
    • Bit Sequence Transmitted by CRC with Generator G(x) = x²+1:
      • 10100001 111
    • Bit Sequence Transmitted by CRC with Generator G(x) = x³+1:
      • 10100011101
    • Protocol for Resolving IP to MAC Addresses:
      • ARP
    • Size of MAC Address:
      • 48 bits
    • Size of IP v4 Address:
      • 32 bits
    • Size of IP v6 Address:
      • 128 bits
    • IP v6 Datagram Format with Header Size:
      • 40 bytes
    • Protocol for Inter-AS Routing:
      • BGP
    • Protocol for Intra-AS Routing:
      • RIP, OSPF, IGRP
    • Data Unit in Physical Layer:
      • Bit
    • Transmission Control Protocol (TCP) Purpose:
      • Connection-oriented
    • User Datagram Protocol (UDP) Advantage:
      • Low overhead
    • Port Address Size in TCP/IP:
      • 16 bits
    • Protocol Used in Error Reporting:
      • ICMP
    • Transport Layer Protocol for Process-to-process Delivery:
      • TCP and UDP
    • Port Number Range for Ephemeral Ports:
      • 1024 to 65535
    • Purpose of PUSH Flag in TCP Header:
      • Indicate end of message and the message to be processed immediately

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    Computer Network Past Paper 2021-2022 PDF

    Description

    Test your knowledge on computer networks with this exam from the Vietnam-Korea University of Information Technology. Covering topics such as the OSI and TCP/IP models, LANs, WANs, and the history of networking, this quiz is essential for any IT student. Challenge yourself and see how well you understand the intricacies of computer networks!

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