Computer Network Exam - 2021-2022
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Questions and Answers

Which service is considered an application layer service?

  • Network virtual terminal
  • All of the mentioned (correct)
  • File transfer, access, and management
  • Mail service

    • SMTP is not used to deliver messages to which of the following?

  • User’s email server
  • User’s email client
  • User’s mailbox
  • User’s word processor (correct)

    • When sending multimedia data over SMTP, what encoding must it undergo?

  • ASCII (correct)
  • Hash
  • Binary
  • Signal

    • What is the purpose of port 20 in File Transfer Protocol (FTP)?

    <p>Data Connection</p> Signup and view all the answers

    Which of the following protocols is primarily used for email transfer?

    <p>Simple Mail Transfer Protocol (SMTP)</p> Signup and view all the answers

    How many layers are in the TCP/IP model?

    <p>5 layers</p> Signup and view all the answers

    What type of computer network operates spanning states, countries, or the whole world?

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

    Which layer in the OSI model is responsible for the syntax and semantics of the information transmitted?

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

    Which layer in the OSI model is responsible for routing packets from source to destination?

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

    Which layers of the OSI model perform the same function as the Application layer of the TCP/IP model?

    <p>Session, Presentation, Application</p> Signup and view all the answers

    Which layer of the OSI model provides inter-network connectivity?

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

    Which of the following is a function of the Data Link layer?

    <p>Provides error detection and correction</p> Signup and view all the answers

    A computer network operating within a building or campus is referred to as what?

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

    Which of these options is not an application layer protocol?

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

    What is the datagram at the application layer called?

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

    Which one of the following represents an architecture paradigm?

    <p>Both Peer to peer and Client-server</p> Signup and view all the answers

    The File Transfer Protocol is built on which type of architecture?

    <p>Client server architecture</p> Signup and view all the answers

    Telnet protocol is used to establish a connection to which TCP port number?

    <p>TCP port number 23</p> Signup and view all the answers

    Which of the following statements is true for E-mail applications?

    <p>Elastic application</p> Signup and view all the answers

    FTP is built on which type of architecture?

    <p>Client-server</p> Signup and view all the answers

    What does FTP stand for?

    <p>File Transfer Protocol</p> Signup and view all the answers

    What is the fixed-length header size of an IPv6 datagram?

    <p>40 bytes</p> Signup and view all the answers

    Which statement accurately describes fragmentation in IPv6?

    <p>Fragmentation is not allowed for IPv6.</p> Signup and view all the answers

    How many 8-bit octets are in an IPv6 address?

    <p>16</p> Signup and view all the answers

    What is the primary goal of a routing algorithm?

    <p>To find the least-cost path.</p> Signup and view all the answers

    What type of routing algorithm is Dijkstra's?

    <p>Link-state routing algorithm</p> Signup and view all the answers

    Which category does the Bellman-Ford routing algorithm belong to?

    <p>Distance vector routing protocol</p> Signup and view all the answers

    After running Dijkstra's algorithm for the second time at node u, which nodes are selected next?

    <p>u, w</p> Signup and view all the answers

    Which potential issue might Dijkstra's routing algorithm encounter?

    <p>Inaccurate link costs.</p> Signup and view all the answers

    Which cable is used for connecting computers directly?

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

    What is the correct color code for the T568A standard?

    <p>White/Green, Green, White/Orange, Orange, White/Blue, Blue, White/Brown, Brown</p> Signup and view all the answers

    What differentiates wiring codes T568A and T568B?

    <p>Difference in color codes</p> Signup and view all the answers

    Which metric measures data transfer speed?

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

    What does the abbreviation 'bps' represent?

    <p>Bits per second</p> Signup and view all the answers

    Which layer of the OSI model is responsible for controlling transmission errors?

    <p>Data Link layer</p> Signup and view all the answers

    What function of the data link layer prevents fast senders from overwhelming slow receivers?

    <p>Flow control</p> Signup and view all the answers

    What is a data unit called in the Data Link layer?

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

    How many segments will the network layer receive for a 4000-byte datagram with an MTU of 1500 bytes?

    <p>=3</p> Signup and view all the answers

    Which Boolean operator is used by a router to determine the network address from an IP address and net/subnet mask?

    <p>=AND</p> Signup and view all the answers

    What is the maximum number of subnets that can be organized with a class C subnet mask of 255.255.255.192?

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

    Which of the following sets of IP addresses are classified as private IP addresses?

    <p>=10.10.10.1; 172.16.0.1; 192.168.1.2</p> Signup and view all the answers

    Which server is responsible for automatically assigning IP addresses to devices in a network?

    <p>=DHCP</p> Signup and view all the answers

    What is the function of NAT in a router?

    <p>=NAT</p> Signup and view all the answers

    What is the size of an IPv6 address?

    <p>=128 bits</p> Signup and view all the answers

    What is the size of the IP v6 datagram header?

    <p>=40 bytes</p> Signup and view all the answers

    Study Notes

    Computer Network Exam - 2021-2022

    • The exam covers computer networking concepts.
    • The exam was given at the Vietnam-Korea University of Information Technology.
    • The exam duration is 60 minutes.
    • The exam consists of multiple-choice questions.
    • The questions originate from a bank of 200 multiple-choice questions.

    Question 1

    • The computer network is a collection of hardware components and computers interconnected by communication channels.
    • It facilitates the sharing of resources and information.
    • All options are correct

    Question 2

    • ARPANET is considered the first computer network.

    Question 3

    • The OSI Model has seven layers.

    Question 4

    • The host-to-host layers are Transport, Session, Presentation, and Application.

    Question 5

    • The TCP/IP model has four layers.

    Question 6

    • A computer network spanning multiple countries or the entire world is called a WAN (Wide Area Network).

    Question 7

    • A computer network operating within a building or campus is called a LAN (Local Area Network).

    Question 8

    • The layer in the OSI model concerned with the syntax and semantics of information transmitted is the Presentation layer.

    Question 9

    • The layer in the OSI model that determines how packets are routed is the Network layer.

    Question 10

    • The layers (OSI) functioning similarly to the Application Layer (TCP/IP) are Session, Presentation, and Application.

    Question 11

    • The layer in the OSI model responsible for network connectivity is the Network layer.

    Question 12

    • The Data Link Layer is responsible for error detection and correction.

    Question 13

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

    Question 14

    • Networks are classified by scale: PAN, LAN, MAN, WAN.

    Question 15

    • Networks are classified by function: Peer-to-Peer and Client-Server

    Question 16

    • A broadcast communication network distributes messages from a single sender to all participants.

    Question 17

    • A protocol defines rules for formatting, transmitting, and receiving data.

    Question 18

    • The unit for measuring data transmission speed is bits per second (bps).

    Question 19

    • Circuit switching is inflexible after a connection path is established.

    Question 20

    • Packet switching dynamically routes packets to their destinations.

    Question 21

    • A Hub operates in the Physical layer of the OSI model.

    Question 22

    • A Switch operates in the Data Link layer of the OSI model.

    Question 23

    • A Router operates in the Network layer of the OSI model.

    Question 24

    • The Ping command is used to check if a device is reachable on a network.

    Question 25

    • The Ipconfig command manages IP addresses on a machine.

    Question 26

    • The fundamental data unit at the physical layer is a bit.

    Question 27

    • The Internet Layer (TCP/IP) functions similarly to the Network Layer (OSI).

    Question 28

    • UTP cables typically have four pairs of wires.

    Question 29

    • Twisted pair cables are twisted to reduce cross-talk interference.

    Question 30

    • UTP cables are classified by length of twist.

    Question 31

    • Category 5e UTP cable is frequently used in Ethernet networks.

    Question 32

    • The maximum length of a single UTP cable for data communication is 100 meters.

    Question 33

    • The maximum length of a single coaxial cable for data communication is 500 meters.

    Question 34

    • The maximum length of a single fiber optic cable for data communication is 2 kilometers.

    Question 35

    • Fiber optic cables are not susceptible to electromagnetic interference.

    Question 36

    • Total internal reflection is utilized in optical fiber transmission.

    Question 37

    • Coaxial cable is commonly used for cable television.

    Question 38

    • A repeater increases the power of a signal and retransmits it.

    Question 39

    • Several types of radiation (radio waves, microwaves, infrared radiation, visible light; ultraviolet radiation; X-rays, gamma rays) are used for communication.

    Question 40

    • Radio waves are used in radar, radio and TV communication, and microwave ovens.

    Question 41

    • Infrared waves are often used in remote control devices.

    Question 42

    • Radio waves are omnidirectional.

    Question 43

    • Microwaves and infrared waves are directional.

    Question 44

    • Wired and wireless networks vary in mobility, security, and speed.

    Question 45

    • Digital line coding is the process of encoding bits into signals.

    Question 46

    • Multiplexing combines multiple signals into one signal.

    Question 47

    • Demultiplexing separates multiple signals into their original signals.

    Question 48

    • Straight-through cables connect computers directly with switches.

    Question 49

    • Crossover cables are used to connect computers together directly.

    Question 50

    • White/Green, Green, White/Orange, Blue, White/Blue, Orange, White/Brown, Brown. is the color code for T568A.

    Question 51

    • Wiring standards T568A and T568B differ in wire color codes.

    Question 52

    • Transfer speeds are measured in bits per second (bps), megabits per second (Mbps), and gigabits per second (Gbps).

    Question 53

    • bps stands for bits per second.

    Question 54

    • The Data Link layer controls transmission errors.

    Question 55

    • The Data Link layer manages the flow of data to avoid overwhelming slow receivers.

    Question 56

    • The data unit at the Data Link layer is a frame.

    Question 57

    • A MAC address is typically 48 bits long.

    Question 58

    • 0F-1F-2F-3F-4F-5F is a valid MAC address.

    Question 59

    • A MAC address uniquely identifies a network interface controller.

    Question 60

    • Bit stuffing and flag bytes are part of the framing technique.

    Question 61

    • Bit stuffing and flag bytes are used in the framing technique.

    Questions 62-72

    • Require bit sequences to be determined and transmitted by using bit parity scheme with even or odd code.
    • These questions require calculations related to bit transmission strategies.

    Question 73

    • The bit pattern from the international standard generator CRC-12 is 1100000001111.

    Question 74

    • The bit pattern from the international standard generator CRC-16 is 11000000000000101.

    Question 75

    • The bit pattern from the international standard generator CRC-CCITT is 10001000000100001.

    Question 76

    • The bit sequence for CRC calculation using generator G(x) = x²+1 with data 10100001 is 10100001111.

    Question 77

    • The bit sequence for CRC calculation using generator G(x) = x³+1 with data 10100011 is 10100011101.

    Question 78

    • ARP resolves IP addresses to MAC addresses.

    Question 79

    • Switches forward data based on the destination MAC address.

    Question 80

    • Switches are characterized by plug-and-play and self-learning capabilities.

    Question 81

    • Random access methods like random access, token passing, and channel partitioning regulate multiple access occurrences in a network.

    Question 82

    • ALOHA is a random-access protocol used at the MAC layer.

    Question 83

    • In Slotted ALOHA, collisions can occur at the start of a time slot.

    Question 84

    • In ALOHA, collisions are possible at any time in a slot.

    Questions 85-88

    • These questions involve considerations of network protocols, such as ALOHA, Slotted ALOHA, CSMA/CD, CSMA/CA, and their efficiencies within different scenarios (e.g., Wi-Fi, Ethernet).

    Question 89

    • The length of a MAC address is 48 bits or 6 octets.

    Question 90

    • 60-F6-77-BE-A3-2F is a valid MAC address.

    Question 91

    • ARP translates IP addresses into MAC addresses.

    Question 92

    • Collisions in Slotted ALOHA can occur at the start of a time slot.

    Question 93

    • Maximum efficiency for Slotted ALOHA is twice that of ALOHA.

    Questions 94-98

    • These questions cover algorithms and standards related to network communication mechanisms like CSMA/CA, FDMA, and TDMA, and network standards like IEEE 802.11 (Wi-Fi) and IEEE 802.3 (Ethernet).

    Questions 99-103

    • These questions deal with network specifications and address assignments.

    Questions 104-108

    • These cover protocol structures and mechanisms for network data transfer.

    Questions 109-113

    • These relate to the structure of IP addresses, including special addresses used for communication.

    Questions 113-118

    • These questions concentrate on IP addresses and datagram structures.
    • These include finding the network addresses given network masks.
    • These cover the size of IP addresses and routing procedures.

    Questions 119-123

    • These questions address IP addressing, including private IP addresses and determining the network address from IP addresses and network masks.

    Questions 124-129

    • These concern the specifics of IPV4/IPV6 addressing, including address sizes and routing algorithm specifications.

    Questions 130-137

    • Explore routing protocols.
    • Describe routing protocols that are used for Inter-AS and Intra-AS routing.

    Questions 138-143

    • Deal with network management protocols.
    • Cover protocols for managing networks and transporting messages (eg. DHCP, DNS, TCP, UDP), and address and port specifications.

    Questions 144-150

    • Focus on transport layer communication and protocols.

    Questions 151-163

    • These involve transport layer specifications and details regarding TCP/IP-related data transfer procedures.
    • These cover addressing (ports, sockets).

    Questions 164-171

    • These questions concentrate on frame relay networks, protocol functionalities and other crucial elements of network communication structures.

    Questions 172-179

    • These cover the definitions and properties of application-layer protocols and their communication methods.
    • They deal with services (e.g. HTTP, FTP) operating at the application layer.

    Questions 180-188

    • These are focussed on detailed operation descriptions, including how messages are transmitted.
    • They relate to protocols used for message transmission and network service details.

    Questions 189-200

    • These cover various details about Internet protocols (e.g., message handling, network management, email transfer).

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    Computer Network Past Paper 2021-2022 PDF

    Description

    Test your knowledge on computer networking concepts with this quiz designed for the Computer Network Exam at Vietnam-Korea University of Information Technology. It includes multiple-choice questions covering topics such as the OSI Model, TCP/IP layers, and WAN definitions. Challenge yourself and see how well you understand the principles of networking!

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