Computer Network Concepts and Models
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Questions and Answers

In which layer of the OSI model does a Switch operate?

  • Physical layer
  • Data link layer (correct)
  • Transport layer
  • Network layer

    • Which OSI model layer does a Router function within?

  • Network layer (correct)
  • Physical layer
  • Transport layer
  • Data link layer

    • What is the purpose of the Ping command?

  • To test if a device on the network is reachable (correct)
  • To test a bug in an application
  • To test printer quality
  • To test a hard disk fault

    • Which command is used to manage the IP address assigned to a machine?

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

    What is known as a data unit on the physical layer?

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

    Which OSI layer functions similarly to the Internet layer of the TCP/IP model?

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

    How many pairs of cables does UTP have?

    <p>4 pairs</p> Signup and view all the answers

    What is the main purpose of twisting the wires in a twisted pair cable?

    <p>Reduce cross-talk interference</p> Signup and view all the answers

    Which of the following services uses TCP?

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

    Which layer is responsible for process to process delivery in the OSI model?

    <p>Transport layer</p> Signup and view all the answers

    Which protocols does the transport layer use for communication over the Internet?

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

    In the FTP protocol, a client contacts a server using which transport protocol?

    <p>Transmission Control Protocol</p> Signup and view all the answers

    Which of the following statements is true for TCP?

    <p>All of the mentioned</p> Signup and view all the answers

    An endpoint of an inter-process communication flow across a computer network is known as what?

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

    Socket-style API for Windows is known as what?

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

    What is the main advantage of using UDP?

    <p>Low overhead</p> Signup and view all the answers

    What components are included in the checksum computation for an IP v4 header?

    <p>IP v4 header only</p> Signup and view all the answers

    Which binary format corresponds to the IP address 192.168.1.1?

    <ol start="11000000"> <li> <ol start="10101000"> <li> <ol> <li>00000001</li> </ol> </li> </ol> </li> </ol> Signup and view all the answers

    What is the correct identification of the parts of an IP v4 address?

    <p>Network – Host</p> Signup and view all the answers

    Which IP v4 address is considered a special address?

    <p>0.0.0.0</p> Signup and view all the answers

    Which address is recognized as the loopback address for a computer?

    <p>127.0.0.1</p> Signup and view all the answers

    What queuing model is typically used for packet scheduling inside a router?

    <p>First-in-First-out (FIFO)</p> Signup and view all the answers

    What does a Time-To-Live (TTL) value of 100 in an IP v4 header signify?

    <p>The packet could traverse a maximum of 100 hops</p> Signup and view all the answers

    What is the size of an IP v4 header?

    <p>20 bytes</p> Signup and view all the answers

    What does Address Resolution Protocol (ARP) primarily do?

    <p>It is used to translate IP addresses to MAC addresses.</p> Signup and view all the answers

    In Slotted ALOHA, when can collisions occur?

    <p>At the beginning of the slot.</p> Signup and view all the answers

    How does the maximum efficiency of Slotted ALOHA compare to ALOHA?

    <p>The maximum efficiency of the Slotted ALOHA is double that of ALOHA.</p> Signup and view all the answers

    Which algorithm is used by a network node running CSMA/CA to delay transmission and avoid collision?

    <p>The exponential back-off algorithm.</p> Signup and view all the answers

    In FDMA, what is the method to handle an assigned frequency band with no data for transmission?

    <p>Let it idle.</p> Signup and view all the answers

    How are time slots allocated in TDMA?

    <p>Divided into fixed-length time slots.</p> Signup and view all the answers

    What does CSMA/CD stand for, and what is its primary purpose?

    <p>Carrier Sense Multiple Access with Collision Detection, intended to prevent collisions.</p> Signup and view all the answers

    What is a defining feature of the ALOHA protocol that increases the chance of collision?

    <p>The lack of a signal for transmission.</p> Signup and view all the answers

    What is the total number of bits in a MAC address?

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

    Which option represents a valid physical address?

    <p>0F-1F-2F-3F-4F-5F</p> Signup and view all the answers

    What is the role of a MAC address?

    <p>To uniquely identify a network interface controller.</p> Signup and view all the answers

    Determine the transmitted bit sequence using byte stuffing with FLAG = 01111110 and ESC = 00001111 from the original data 00001111 00110011 01111110.

    <p>00001111 00001111 00110011 00001111 01111110</p> Signup and view all the answers

    From the original data 10000011 00001111 01111110, what is the resulting bit sequence using byte stuffing?

    <p>10000011 00001111 00001111 00001111 01111110</p> Signup and view all the answers

    Given the received bit sequence 10111110 0000111 00001111 0000111 01111110 00110011, what is the original data after applying byte stuffing?

    <p>10111110 00001111 01111110 00110011</p> Signup and view all the answers

    What issue does the Bellman-Ford routing algorithm potentially encounter?

    <p>Count to infinity</p> Signup and view all the answers

    How do network nodes determine their distance vector in the Bellman-Ford routing protocol?

    <p>By sharing information with neighboring nodes</p> Signup and view all the answers

    Which set of protocols is primarily used for intra-AS routing?

    <p>RIP/OSPF/IGRP</p> Signup and view all the answers

    What is the correct protocol to use for error reporting in a computer network?

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

    Which routing protocol is suitable for inter-AS routing?

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

    In a scenario where the link cost changes from 4 to 60, how many iterations are needed for the Bellman-Ford protocol to stabilize?

    <p>44</p> Signup and view all the answers

    Which of the following is a true statement about a managed device in a network management framework?

    <p>A managed device can contain multiple managed objects.</p> Signup and view all the answers

    Which phenomenon can lead to routing oscillation in computer networks?

    <p>Change in link cost</p> Signup and view all the answers

    Study Notes

    Exam Information

    • Exam title: Computer Network
    • Exam date: 2021-2022
    • Institution: University of Information Technology and Communication (Viet-Han)

    Computer Network Concepts

    • Computer network is a collection of hardware components and computers interconnected by communication channels for sharing resources and information.
    • ARPANET is considered the first computer network.

    OSI Model Layers

    • The OSI model has 7 layers.
    • Host-to-host layers are Transport, Session, Presentation, and Application layers.

    TCP/IP Model Layers

    • The TCP/IP model has 4 layers.

    Network Types

    • A computer network operating within a building or campus is a LAN.
    • A computer network operating spanning states, countries, or the whole world is a WAN.

    Data Unit Arrangement

    • Data, Segment, Packet, Frame, Bit is the correct arrangement of data units in the OSI model from top-down.

    Network Classification

    • Networks are classified by scale (PAN, LAN, MAN, WAN) and by function (peer-to-peer, client-server).

    OSI Model Data Layer

    • The data link layer provides error detection and correction.
    • Defines the electrical characteristics of signals passed between the computer and communication devices.
    • Provides error detection and correction.

    OSI Model Physical Layer

    • The physical layer is responsible for the electrical characteristics of signals.

    OSI Model Network Layer

    • The network layer determines how packets are routed from source to destination.

    TCP/IP Model Internet Layer

    • Operating as the same function as the Internet layer.

    Data Unit Types

    • Bit, Frame, Packet, Segment
    • Bit is the data unit in the physical layer.
    • Frame is the data unit in the data link layer.

    Network Cable Types

    • UTP cable is commonly used in Ethernet networks.
    • Twisted pair cable is used to reduce cross-talk interference.
    • Fiber optic cable is a cable that is not affected by electromagnetic interference.

    Network Protocols

    • ARP (Address Resolution Protocol) translates IP addresses to MAC addresses.
    • DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to computers in a network.
    • SMTP (Simple Mail Transfer Protocol) is used for transferring mail.
    • TCP, UDP in transport layer

    Network Devices and Protocols

    • Hub operates at the physical layer.
    • Switch operates at the data link layer.
    • Router operates at the network layer.
    • Repeater increases signal strength.

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    Related Documents

    Computer Network Past Paper 2021-2022 PDF

    Description

    Test your knowledge on key concepts in computer networking, including the OSI and TCP/IP models, network types, and the arrangement of data units. Explore the foundations of how networks operate and their classifications. Perfect for university students in information technology programs.

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