Networking Fundamentals Quiz
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Questions and Answers

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

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

    • Which layer of the OSI model is associated with the function of a Router?

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

    • What is the main purpose of the Ping command?

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

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

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

    What is referred to as a data unit at the physical layer?

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

    Which layer of the OSI model performs functions similar 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 (Unshielded Twisted Pair) cable have?

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

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

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

    Which protocol is primarily used for email transmission over the Internet?

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

    What is the primary purpose of the transport layer in networking?

    <p>Process to process delivery</p> Signup and view all the answers

    Which combination of protocols does the transport layer utilize for Internet communication?

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

    Which transport protocol does FTP use for establishing connections?

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

    Which of the following statements is accurate regarding TCP?

    <p>It utilizes a three-way handshake for connection establishment.</p> Signup and view all the answers

    In networking, what is a 'socket'?

    <p>The endpoint of an inter-process communication flow</p> Signup and view all the answers

    What is the name of the socket API commonly used on Windows operating systems?

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

    What is considered one of the main advantages of using UDP over TCP?

    <p>It has low overhead.</p> Signup and view all the answers

    Which of the following is not considered an application layer protocol?

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

    What is the term used for a datagram at the application layer?

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

    Which of the following correctly describes an architecture paradigm?

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

    The File Transfer Protocol is primarily built on which architecture?

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

    Telnet protocol establishes a connection to which TCP port number?

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

    Which statement accurately describes E-mail in terms of its application type?

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

    FTP operates primarily under which architectural model?

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

    What does FTP stand for in networking terminology?

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

    Which of the following protocols is specifically designed for managing devices on an IP network?

    <p>Simple Network Management Protocol</p> Signup and view all the answers

    Which option is not classified as an application layer protocol?

    <p>Resource Reservation Protocol</p> Signup and view all the answers

    What protocol is predominantly used by the application layer when displaying a web page?

    <p>HTTP Protocol</p> Signup and view all the answers

    SMTP primarily defines what aspect of message handling?

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

    An email client must know the _________ of its initial SMTP server to function properly.

    <p>IP Address</p> Signup and view all the answers

    When a mail server sends emails to other mail servers, it functions as a __________.

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

    Which TCP port is designated for use by the Simple Mail Transfer Protocol?

    <p>25</p> Signup and view all the answers

    What does the acronym SMTP stand for?

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

    Which statement accurately describes the transmission behavior in the ALOHA protocol?

    <p>Nodes immediately transmit data once they have something to send.</p> Signup and view all the answers

    What is 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 specifically used by Ethernet?

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

    Which random access protocol does the Wi-Fi network implement?

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

    In which scenario can a node transmit data immediately as per the specified medium access control mechanism?

    <p>When the medium is idle for a period longer than DIFS.</p> Signup and view all the answers

    What is the correct size of a MAC address?

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

    Which of the following options correctly defines a MAC address?

    <p>An identifier assigned to a network interface for communications.</p> Signup and view all the answers

    What feature distinguishes the ALOHA protocol from other random access protocols?

    <p>It allows for immediate data transmission without waiting for a slot.</p> Signup and view all the answers

    Which technique is capable of detecting and correcting a single bit error?

    <p>Single bit parity scheme</p> Signup and view all the answers

    What is the correct bit sequence to transmit using the two-dimensional parity scheme with even code and a 3x5 matrix for the original data 10101 11110 01110?

    <p>101010 111100 011101 001010</p> Signup and view all the answers

    What is the original data from the received bit sequence 101011 111100 011101 001010 using the two-dimensional parity scheme?

    <p>10101 11110 01110 00101</p> Signup and view all the answers

    What is the bit pattern from the international standards generator for CRC-12 expressed as $x^{12} + x^{11} + x^3 + x^2 + x + 1$?

    <p>1100000001111</p> Signup and view all the answers

    Which of the following is the correct bit pattern for the CRC-16 generator $x^{16} + x^{15} + x^2 + 1$?

    <p>11000000000000101</p> Signup and view all the answers

    What is the bit pattern for CRC-CCITT given the polynomial $x^{16} + x^{12} + x^{5} + 1$?

    <p>10001000000100001</p> Signup and view all the answers

    What bit sequence is transmitted using the Cyclic Redundancy Check (CRC) with Generator $G(x) = x^{3}+1$ for the original data 10100001?

    <p>10100001 111</p> Signup and view all the answers

    In what scenario can the two-dimensional parity scheme be ineffective?

    <p>When multiple bits are altered</p> Signup and view all the answers

    Study Notes

    Exam Information

    • Exam title: Computer Network Exam
    • Semester: 1
    • Academic year: 2021-2022
    • Institution: University of Information Technology and Communication (Vietnam-Korea)

    Exam Questions

    • Question 1: A computer network is
      • A collection of hardware components and computers.
      • Interconnected by communication channels.
      • Sharing of resources and information.
      • All of the above.
    • Question 2: Which network is considered the first computer network?
      • ARPANET
    • Question 3: How many layers does the OSI Model have?
      • 7
    • Question 4: Which OSI layers are host-to-host layers?
      • Transport, Session, Presentation, and Application
    • Question 5: How many layers are in the TCP/IP model?
      • 4
    • Question 6: A computer network spanning states, countries, or the whole world is a
      • WAN
    • Question 7: A computer network operating within a building or campus is a
      • LAN
    • Question 8: Which OSI layer deals with the syntax and semantics of information?
      • Presentation
    • Question 9: Which OSI layer determines how packets are routed between source and destination?
      • Network
    • Question 10: Which OSI layers perform the same function as the Application layer in the TCP/IP model?
      • Session, Presentation, and Application
    • Question 11: Which OSI layer provides inter-network connectivity?
      • Network
    • Question 12: What is a function of the Data Link layer?
      • Provides error detection and correction
    • Question 13: Arrange the OSI data units in top-down order
      • Data, Segment, Packet, Frame, Bit
    • Question 14: How are networks classified by scale?
      • PAN, LAN, MAN, WAN
    • Question 15: How are networks classified by function?
      • Peer-to-Peer, Client-Server
    • Question 16: Which type of network is used when transmitting messages from a single sender to all endpoints?
      • Broadcast
    • Question 17: What is a set of rules that dictates how data is formatted, transmitted, and received?
      • Protocol
    • Question 18: What is the commonly used unit for measuring data transmission speed?
      • Bits per second
    • Question 19: Describe a network that is inflexible once a path is established
      • Circuit Switching
    • Question 20: Describe a flexible network where packets can take different routes to reach their destination.
      • Packet Switching
    • Question 21: Which layer does a Hub operate in the OSI model?
      • Physical layer
    • Question 22: Which layer does a Switch operate in the OSI model?
      • Data Link layer
    • Question 23: Which layer does a Router operate in the OSI model?
      • Network layer
    • Question 24: What is the purpose of the Ping command?
      • To test if a device on the network is reachable
    • Question 25: Which command manages IP address settings?
      • Ipconfig
    • Question 26: What is the data unit at the physical layer?
      • Bit
    • Question 27: Which OSI layer performs the same function as the Internet layer in TCP/IP model?
      • Network
    • Question 28: How many pairs of wires does a UTP cable have?
      • 4 pairs
    • Question 29: Why are the wires in a twisted-pair cable twisted?
      • To reduce cross-talk interference
    • Question 30: How is a twisted-pair cable UTP classified?
      • By length of twist
    • Question 31: Category 5e UTP cable is commonly used in which network type?
      • Ethernet
    • Question 32: Maximum length of a single UTP cable for data communication
      • 100 meters
    • Question 33: Maximum length of a single coaxial cable for data communication
      • 500 meters
    • Question 34: Maximum length of a single fiber optic cable for data communication
      • 2 kilometers
    • Question 35: Which cable type is not affected by electromagnetic interference?
      • Fiber optic cable
    • Question 36: Which physical phenomenon is used in fiber optic transmission?
      • Total internal reflection
    • Question 37: Which cable type is frequently used for cable television?
      • Coaxial cable
    • Question 38: Which device increases signal power and retransmits it?
      • Repeater
    • Question 39: Which radiations are used for communication?
      • Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays
    • Question 40: What are some applications of radio waves?
      • Radar, radio, television, communication, microwave ovens, and sterilization
    • Question 41: Which waves are commonly used in remote controls?
      • Infrared waves
    • Question 42: Which of the given waves is omnidirectional (radio, microwave, infrared)?
      • Radio Waves
    • Question 43: Which of the given waves is directional (radio, microwave, infrared)?
      • Microwaves, Infrared
    • Question 44: What are the differences between wired and wireless networks?
      • Mobility, Security, Speed
    • Question 45: What is the process of encoding bits into signals?
      • Digital line coding
    • Question 46: What technique combines multiple signals into one signal?
      • Multiplexing
    • Question 47: What technique converts a multi-signal stream back to individual signals?
      • De-multiplexing
    • Question 48: Which cable is used to connect computers to switches?
      • Straight-through cable
    • Question 49: Which cable is typically used to connect computers directly?
      • Crossover cable
    • Question 50: What are the colors for the T568A standard?
      • White/Green, Green, White/Orange, Orange, White/Blue, Blue, White/Brown, Brown and other combinations
    • Question 51: What are the differences between wiring codes T568A and T568B?
      • Color code differences of the wires
    • Question 52: What metrics measure data transfer speed?
      • bps, Mb/s, and Tb/s
    • Question 53: What does bps stand for?
      • Bits per second
    • Question 54: Which OSI layer controls transmission errors?
      • Data Link layer
    • Question 55: What function of a data link layer helps prevent receiver overload?
      • Flow control
    • Question 56: What is the data unit on the data link layer?
      • Frame
    • Question 57: How many bits are in a MAC address?
      • 48 bits
    • Question 58: Which of the given addresses is a physical address?
      • Example: 0F-1F-2F-3F-4F-5F
    • Question 59: What is a unique identifier for a network interface controller?
      • MAC address
    • Question 60: Determine the bit sequence for transmitted data using flag bytes in the framing technique.
      • Example output: 00001111 01111110 00001111 00110011 01111110
    • Question 61: Determine the bit sequence for transmitted data using flag bytes in the framing technique.
      • Example output: Example 10000011 00001111 01111110
    • Question 62: Determine the original data from a bit sequence given.
      • Example output: 10111110 00001111 01111110 00110011
    • Questions 63-72: Determine the bit sequence for transmitted data using single bit parity schemes with even/odd code.
      • Example output: 0110001011111. In total there are 6 questions
    • Question 73: What is the bit pattern from the international standard generator CRC-12?
    • Example bit pattern: 1100000001111
    • Questions 74-75: Questions to determine bit patterns based on international standard generators CRC-16 and CRC-CCITT
      • Example answers are bit patterns
    • Question 76: Determine the bit sequence transmitted using the CRC technique with Generator G(x) = x²+1
      • Example output: 10100001 111
    • Question 77: Determine the bit sequence transmitted using the CRC technique with Generator G(x) = x³+1
      • Example Output: 10100011 101
    • Question 78: Which protocol is responsible for translating IP addresses to MAC addresses?
      • ARP
    • Question 79: Which device forwards data based on destination MAC address?
      • Switch
    • Question 80: Which characteristic describes a switch?
      • Plug-and-play and self-learning
    • Question 81: Which method controls multiple accesses in a network?
      • Random access
    • Question 82: Which random access protocols does the Ethernet apply?
      • CSMA/CD
    • Question 83: Which statements are true for Slotted ALOHA?
      • Time is divided into equal size slots, nodes transmit data at the start of each slot
    • Question 84: Which statements are true for ALOHA protocol?
      • Time is not divided into equal size slots, the node immediately transmits data once it has data.
    • Question 85: What is the order of efficiency of ALOHA, Slotted ALOHA, and CSMA protocols?
      • ALOHA – Slotted ALOHA – CSMA
    • Question 86: Which random access protocol does Ethernet use?
      • CSMA/CD
    • Question 87: Which random access protocol does Wi-Fi use?
      • CSMA/CA
    • Question 88: Which network mechanism fits the "idle for DIFS" condition?
      • Wi-Fi
    • Question 89: What is the size of a MAC address in bits?
      • 48 bits
    • Question 90: Which of the given addresses is a MAC address?
      • Example: 0F-1F-2F-3F-4F-5F
    • Question 91: What does the ARP protocol do?
      • Translates IP addresses to MAC addresses
    • Question 92: In Slotted ALOHA, where can collisions happen?
      • Beginning of the slot
    • Question 93: What is the efficiency comparison between Slotted ALOHA and ALOHA?
      • Slotted ALOHA efficiency is double that of ALOHA
    • Question 94: Describe the exponential back-off algorithm in CSMA/CA
      • The algorithm delays transmission to avoid collisions
    • Question 95: How does the FDMA manage an idle frequency band?
      • Leave it idle
    • Question 96: How does TDMA manage an idle time slot?
      • Leave it idle
    • Question 97: Which standard is recommended for Wi-Fi networks?
      • IEEE 802.11
    • Question 98: Which standard is recommended for Ethernet?
      • IEEE 802.3
    • Question 99: Which standard is recommended for WiMAX networks?
      • IEEE 802.16
    • Question 100: What is the purpose of the preamble in Ethernet frames?
      • To synchronize the receiver's clock with the sender's clock
    • Question 101: Calculate network and broadcast addresses given an IP address and subnet mask.
    • Question 102: Calculate network and broadcast addresses given an IP address and subnet mask.
    • Question 103: Calculate available IP addresses given a network address.
    • Question 104: What planes are organized on a network layer?
      • control plane, data plane, and link layer
    • Question 105: Calculate the average buffer size for a router.
    • Question 106: Calculate the average buffer size for a router.
    • Question 107: What is the size of an IPv4 address in bits?
      • 32 bits
    • Question 108: Which field determines IP packet priority?
      • Type-of-service (TOS) field
    • Question 109: What is the size of the checksum field in an IPv4 header?
      • 16 bits
    • Question 110: What is included in checksum computation for IPv4 header?
      • IPv4 header only
    • Question 111: Convert an IPv4 address to binary format.
    • Question 112: What are the parts of an IPv4 address format?
      • Network and host
    • Question 113: Identify special IPv4 addresses
      • Example: 0.0.0.0, 127.0.0.1,
    • Question 114: Which is the loopback address?
      • 127.0.0.1
    • Question 115: What is the packet scheduling method in a router?
      • First-In-First-Out (FIFO)
    • Question 116: What does a TTL value of 100 mean in an IP packet?
      • Packet can traverse a maximum of 100 hops
    • Question 117: What is the size of an IPv4 header?
      • 20 bytes
    • Question 118: Calculate the number of segments needed to send a 4000-byte datagram over a link with a 1500-byte MTU.
    • Question 119: What Boolean operator does a router use for network address calculations?
      • AND
    • Question 120: Given the subnet mask 255.255.255.192, calculate the number of subnets that can be created for a class C network
      • 4
    • Question 121: Identify private IP addresses
      • Example output: 10.10.10.1, 172.16.0.1, 192.168.1.2
    • Question 122: What server automatically assigns IP addresses?
      • DHCP
    • Question 123: Which router function translates IP addresses between networks?
      • NAT
    • Question 124: What is the size of an IPv6 address?
      • 128 bits
    • Question 125: State the correct statement about IPv6 datagram format
      • The IPv6 datagram format has a 40-byte fixed-length header
    • Question 126: Which statement is correct for fragmentation in IPv6?
      • Fragmentation is not allowed
    • Question 127: How many 8-bit octets are in an IPv6 address?
      • 16
    • Question 128: What does a routing algorithm seek when determining a path for forwarding?
      • The least-cost path between source and destination
    • Question 129: Categorize the Dijkstra routing algorithm
      • Link-state routing algorithm
    • Question 130: Categorize the Bellman-Ford Routing Algorithm
    • Distance vector routing protocol
    • Question 131: Which nodes are selected for routing table after the 2nd round with the Dijkstra algorithm on a specific network graph?
      • Example Output: u,w
    • Question 132: Which problem might occur in the Dijkstra routing algorithm?
      • Routing oscillation
    • Question 133: What is an appropriate statement for Bellman-Ford Routing?
      • Each node constructs its distance vector based on routing information from neighboring nodes
    • Question 134: What is a potential problem with the Bellman-Ford routing algorithm?
      • Count-to-infinity problem
    • Question 135: How many iterations are needed for Bellman-Ford Routing to reach stable state if a link cost changes (on a given graph)
    • Question 136: State suitable intra-AS routing protocols.
      • RIP, OSPF, IGRP
    • Question 137: Name a suitable inter-AS routing protocol
      • BGP
    • Question 138: Which protocol handles error reporting in a network?
      • ICMP
    • Question 139: Which statement accurately describes network management frameworks?
      • A managed device contains a database of managed objects with the data stored in the Management Information Base(MIB)
    • Question 140: Describe the use modes of the SNMP protocol that convey information to and from the Management Information Base (MIB).
      • Request and response, and trap modes
    • Question 141: Which layer receives aggregated data after the transport layer processing?
      • The network layer
    • Question 142: Which layer is responsible for receiving data from transport layer?
      • Network layer
    • Question 143: Which protocols are used in the transport layer?
      • TCP, UDP
    • Question 144: State a correct statement for the transmission control protocol (TCP).
      • TCP is a connection-oriented protocol, uses three-way handshake, and receives data from the application layer as a single stream.
    • Question 145: Define the term endpoint in the context of two-way network communications.
      • Socket
    • Question 146: Which one is a UDP version with congestion controls?
      • Datagram congestion control protocol
    • Question 147: What does transport layer communication deal with?
      • Application to application communication
    • Question 148: What are temporary/private port numbers in range 49,152 to 65,535 called
      • Registered ports
    • Question 149: Which protocol operates at the transport layer?
      • Stream control transmission protocol
    • Question 150: What field is used in UDP headers to find errors in user datagrams?
      • Checksum
    • Question 151: How many bits does a port address in a TCP/IP protocol take?
      • 16 bits
    • Question 152: Describe a protocol that only adds port address, checksum, length data from higher layers
      • UDP
    • Question 153: Which layer is responsible for message delivery between processes?
      • Transport Layer
    • Question 154: What needs to be considered for correct application delivery of a message
      • Port number
    • Question 155: Which service uses TCP?
      • SMTP
    • Question 156: Which layer is responsible for process-to-process delivery?
      • Transport layer
    • Question 157: Which transport layer protocols handle communications?
      • UDP and TCP
    • Question 158: What protocol in FTP transmits data to a server?
      • TCP
    • Question 159: What does the TCP protocol use that specifies communication between processes?
      • Connection oriented protocol, uses three-way handshake, and receives data from application
    • Question 160: What is the endpoint for inter-process communication called
      • Socket
    • Question 161: What is another name for socket API on Windows
      • Winsock
    • Question 162: What is the main advantage of UDP?
      • Low overhead
    • Question 163: Define the term used for a transport service access point in TCP
      • Port
    • Question 164: What is the primary use of the expanded address in frame relay networks?
      • The expanded address increases the range of data link connection identifiers
    • Question 165: What term describes an attempt to block access to a network resource?
      • Denial-of-service attack
    • Question 166: Which protocol offers reliable communication?
      • TCP
    • Question 167: What protocol provides connection-oriented service for sending messages?
      • TCP
    • Question 168: Which protocol is defined in the transport layer?
      • TCP, UDP
    • Question 169: What does the port number in a TCP connection specify?
      • The communication process on both ends of the connection
    • Question 170: Specify the usual range of ephemeral ports.
      • 1024 to 65535
    • Question 171: What is the function of the PUSH flag in a TCP header?
      • Indicates the end of a message or the need to transmit the entire message immediately
    • Question 172: Define an application layer protocol not defined within the context of previously given questions
      • TCP
    • Question 173: What is another name for a datagram at application layer
      • Message
    • Question 174: What are architectural paradigms for networks?
      • Client/server and Peer to Peer
    • Question 175: Describe the architecture of a file transfer protocol
      • Client server
    • Question 176: What Telnet port is commonly used to establish a connection?
      • TCP port 23
    • Question 177: Define an application that is described by its loss tolerance and less sensitivity to the bandwidth
      • Elastic application
    • Question 178: On which architecture is FTP built upon?
      • Client-server architecture
    • Question 179: Define FTP
      • File Transfer Protocol
    • Question 180: What is the standard unit for data transfer in telnet operations?
      • 8 bits
    • Question 181: Define a time-sensitive service in the context of networks
      • Internet telephony
    • Question 182: Describe the available services for applications within a network.
      • Reliable data transfer, timing, and security
    • Question 183: Which protocol is used by email services?
      • SMTP
    • Question 184: Define a service used in internet that translates domain names to IP addresses
      • Domain Name System (DNS)
    • Question 185: Define a protocol where a user on one site connects to another site for remote access
      • TELNET
    • Question 186: What does application layer protocols define?
      • Types of messages, their formats, process rules for sending and receiving messages
    • Question 187: What is a name for encoding of binary data in ASCII format?
      • Base 64 encoding
    • Question 188: Which protocol delivers mail to receiver servers?
      • SMTP (Simple Mail Transfer Protocol)
    • Question 189: Define a protocol that manages devices on IP networks
      • SNMP (Simple Network Management Protocol)
    • Question 190: State one Application layer protocol not present in previously generated questions
      • Resource Reservation Protocol (RSVP)
    • Question 191: What protocol is used for displaying webpages?
      • HTTP
    • Question 192: List what SMTP defines in its description.
      • Message transport
    • Question 193: What information does an email client need about its mail server
      • IP address
    • Question 194: What action does a mail server perform when sending mail to other mail servers?
      • Acts as an SMTP client
    • Question 195: What TCP port is associated with SMTP?
      • Port 25
    • Question 196: Give the full name of SMTP
      • Simple Mail Transfer Protocol
    • Question 197: Define an application service that encompasses network virtual terminal, file transfer, and mail services
      • All of the mentioned services
    • Question 198: What does SMTP not use for delivery?
      • User's word processor
    • Question 199: What encoding is required for multimedia data sent over SMTP?
      • ASCII encoding
    • Question 200: For FTP connections, what are the functions of port 21 and port 20?
      • Port 21: Control connection, Port 20: Data connection

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