Computer Network Fundamentals Exam 2021-2022
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Questions and Answers

What is a computer network?

  • A collection of software components only.
  • A standalone computer system.
  • Interconnected devices sharing information. (correct)
  • A group of computers without communication channels.

Which of the following networks is recognized as the first computer network?

  • ASAPNET
  • CNNET
  • ARPANET (correct)
  • NSFNET

How many layers are there in the OSI Model?

  • 4
  • 5
  • 7 (correct)
  • 6

Which layers of the OSI model are considered host-to-host layers?

<p>Transport, Session, Presentation, Application (C)</p> Signup and view all the answers

What is NOT a defining characteristic of a computer network?

<p>It consists only of hardware components. (A)</p> Signup and view all the answers

Which of the following is a purpose of computer networks?

<p>To facilitate remote access. (D)</p> Signup and view all the answers

What role does the Transport layer play in the OSI model?

<p>It manages end-to-end communication between devices. (B)</p> Signup and view all the answers

Which network protocol is associated with the OSI model's Application layer?

<p>HTTP (A)</p> Signup and view all the answers

What action does TDMA take when an assigned time slot has no data for transmission?

<p>Share it to other stations (C)</p> Signup and view all the answers

Which standard is recommended for a Wi-Fi network?

<p>IEEE 802.11 (B)</p> Signup and view all the answers

Which standard is recommended for an Ethernet network?

<p>IEEE 802.3 (B)</p> Signup and view all the answers

What is the purpose of the Preamble field in Ethernet frame format?

<p>To synchronize the receiver’s clock (B)</p> Signup and view all the answers

What are the network address and broadcast address for the IP address 172.25.114.250/24?

<p>172.25.114.0 &amp; 172.25.114.255 (B)</p> Signup and view all the answers

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

<p>port (C)</p> Signup and view all the answers

Extended address in frame relay networks is used to?

<p>to increase the range of data link connection identifiers (A)</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 (A)</p> Signup and view all the answers

Which protocol is known for providing reliable communication?

<p>TCP (D)</p> Signup and view all the answers

Which protocol provides a connection-oriented reliable service for sending messages?

<p>TCP (B)</p> Signup and view all the answers

Which of the following protocols is defined in the Transport layer?

<p>TCP and UDP (A)</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 (B)</p> Signup and view all the answers

Which layer of the OSI model does a Switch operate in?

<p>Data link layer (D)</p> Signup and view all the answers

What is the typical range of Ephemeral ports?

<p>1024 to 65535 (C)</p> Signup and view all the answers

What is the use of the Ping command?

<p>To test if a device on the network is reachable (D)</p> Signup and view all the answers

Which command is used to manage the IP address assigned to the machine running it?

<p>Ipconfig (D)</p> Signup and view all the answers

A data unit at the physical layer is known as what?

<p>Bit (A)</p> Signup and view all the answers

Which layer of the OSI model functions the same as the Internet layer of the TCP/IP model?

<p>Network (D)</p> Signup and view all the answers

UTP cable contains how many pairs of wires?

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

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

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

How many segments will the network layer receive for sending a 4000-byte datagram if the MTU is 1500 bytes?

<p>3 (C)</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 subnet mask?

<p>AND (A)</p> Signup and view all the answers

How many subnets can be organized with a class C subnet mask of 255.255.255.192?

<p>4 (D)</p> Signup and view all the answers

Which of the following IP addresses are considered private?

<p>10.10.10.1; 172.16.0.1; 192.168.1.2 (C)</p> Signup and view all the answers

Which server automatically assigns IP addresses to computers in the network?

<p>DHCP (D)</p> Signup and view all the answers

What is the function of NAT in networking?

<p>Translation of IP addresses (C)</p> Signup and view all the answers

What is the total size of an IPv6 address?

<p>128 bits (C)</p> Signup and view all the answers

What is the header size of an IPv6 datagram?

<p>40 bytes with optional header (C)</p> Signup and view all the answers

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

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

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

<p>16 (C)</p> Signup and view all the answers

Which statement is true regarding a routing algorithm?

<p>It finds the shortest-cost path for data forwarding. (B)</p> Signup and view all the answers

What type of routing algorithm is the Dijkstra algorithm classified as?

<p>A link-state routing algorithm (A)</p> Signup and view all the answers

The Bellman-Ford routing algorithm is categorized as which of the following?

<p>A distance vector routing protocol (B)</p> Signup and view all the answers

According to the Dijkstra algorithm, which node is selected after the second round when starting from node u?

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

Which of the following is a potential problem faced by the Dijkstra routing algorithm?

<p>It cannot handle negative path costs. (C)</p> Signup and view all the answers

Which of the following statements about fragmentation in IPv6 is accurate?

<p>Fragmentation is not allowed in IPv6. (D)</p> Signup and view all the answers

Flashcards

Computer Network

A collection of interconnected hardware components and computers that share resources and information.

First Computer Network

ARPANET was the first computer network.

OSI Model Layers

The OSI model has 7 layers that describes how network communication works.

Host-to-Host Layers (OSI)

Transport, Session, Presentation, and Application layers in the OSI model. These layers handle communication between applications in different machines.

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Computer Network Components

Hardware components and computers that form the computer network.

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Interconnected by Channels

Communication channels connect devices and computers within a network.

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Resource Sharing

Networks allow computers to share resources and information.

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Network Communication

The process of exchanging information and resources between computers on a network.

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Switch OSI layer

A switch operates at the Data Link layer (Layer 2) of the OSI model.

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Router OSI layer

A router functions at the Network layer (Layer 3) of the OSI model.

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Ping command use

Ping is used to check network connectivity by sending a message to a device and seeing if it responds.

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IP address management command

Ipconfig is used to display current TCP/IP network configuration.

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Physical layer data unit

A bit is the fundamental unit of data transmitted at the physical layer.

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OSI Network Layer Equivalent

The OSI Network layer performs the same function as the Internet layer in the TCP/IP model.

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UTP cable pairs

UTP cables contain 4 pairs of wires.

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Twisted pair cable function

Twisting wires in a twisted pair cable reduces crosstalk interference.

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TDMA time slot with no data

A TDMA (Time Division Multiple Access) time slot assigned but containing no data for transmission.

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Recommended Wi-Fi standard

IEEE 802.11 is the standard for Wi-Fi networks.

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Recommended Ethernet standard

IEEE 802.3 is the standard for Ethernet networks.

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Recommended WiMAX standard

IEEE 802.16 defines the WiMAX (Worldwide Interoperability for Microwave Access) standard.

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Ethernet preamble purpose

The preamble's 10101010 pattern synchronizes the receiver's clock with the sender's.

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IP network address (172.25.114.250/24)

The network address is 172.25.114.0, calculated from the IP address and subnet mask.

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IP broadcast address (172.25.114.250/24)

The broadcast address is 172.25.114.255.

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IP network address (172.25.114.250/16)

The network address is 172.25.0.0, calculated using the subnet mask.

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MTU

Maximum Transmission Unit (MTU) refers to the largest size of a data packet that can be transmitted over a specific network interface or link. It's like the payload capacity of a network highway.

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Datagram Fragmentation

When a data packet is larger than the MTU, it needs to be split into smaller fragments to fit the network's limitations. This process is called fragmentation.

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How many segments?

To determine the number of segments needed, divide the total data packet size by the MTU and round up to the nearest whole number.

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AND Operation for IP

A router uses the bitwise AND operation to calculate the network address of a computer from its IP address and subnet mask.

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Subnet Mask

A subnet mask is a 32-bit number that identifies the network portion of an IP address. It acts like a mask that distinguishes the network ID from the host ID.

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Subnets

Subnets are smaller divisions within a larger network. They allow for better management, security, and efficiency.

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Private IP Addresses

Private IP addresses are used within a private network and are not routable on the public internet.

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DHCP Server

A DHCP server automatically assigns IP addresses to devices connected to a network. It makes it easier to connect devices without manual configuration.

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What's a Port in TCP?

A TCP port number indicates the specific application or service a device is using to communicate.

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Extended Address in Frame Relay

An extended address in Frame Relay increases the range of possible data link connection identifiers, allowing more connections.

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Denial-of-service (DoS) Attack

A DoS attack attempts to overwhelm or disable a target system by flooding it with traffic, making it unavailable to legitimate users.

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Reliable Communication Protocol

A reliable communication protocol like TCP ensures data is delivered accurately and in order, with error checking and retransmission.

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TCP's Service

TCP provides a connection-oriented, reliable service, meaning it establishes a connection, guarantees data delivery, and handles errors.

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Transport Layer Protocols

TCP and UDP are the two main protocols operating at the Transport layer, managing data flow and communication between applications.

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TCP Port Number's Purpose

The port number in a TCP connection identifies the specific application or service on each communicating device.

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Ephemeral Port Range

Ephemeral ports are temporary ports used by applications for short-lived connections. Their range is typically 1024 to 65535.

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IP v6 Header Size

The fixed-length header of an IPv6 datagram is 40 bytes long.

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IP v6 Fragmentation

IP v6 does not allow fragmentation of packets. If a packet is too large for the network path, it is discarded.

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IPv6 Address Size

An IPv6 address consists of 16 octets, each containing 8 bits.

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Routing Algorithm Goal

A routing algorithm aims to find the path with the lowest cost (e.g., shortest distance, least hops) between a source and destination in a network.

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Dijkstra Routing Algorithm Type

The Dijkstra algorithm is a link-state routing algorithm.

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Bellman-Ford Routing Algorithm Type

The Bellman-Ford algorithm is a distance vector routing algorithm.

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Dijkstra Algorithm Second Round

In the second round of Dijkstra's algorithm, node 'w' would be selected for the routing table at node 'u'.

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Dijkstra Algorithm Challenge

The Dijkstra algorithm doesn't work well with negative edge weights.

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Study Notes

Exam Information

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

Exam Content

  • The exam consists of 7 papers
  • Each paper has 60 questions. 
  • Questions are multiple choice.
  • There is a database of 200 questions
  • The questions cover the fundamental concepts of computer networks

Topics and Questions

  • Computer Network: A collection of hardware components, computers interconnected by communication channels, and resources/information sharing.

  • First computer network: ARPANET. 

  • Layers of OSI Model: 7 layers. 

  • OSI model host-to-host layers: Layers 4, 5, 6, and 7 (Transport, Session, Presentation, and Application)

  • Layers in TCP/IP model: 4 layers. 

  • Computer network spanning across continents/world: WAN.

  • Computer network within a building/campus: LAN.

  • OSI layer responsible for syntax/semantics of data: Presentation layer,

  • OSI layer determining packet routing: Network layer. 

  • Speed of data transmission unit: bits per second. 

  • Network type classified by scale: PAN, LAN, MAN, WAN

  • Network type classified by function: Peer-to-peer, Client-Server

  • Data unit on physical layer: Bit

  • Data unit on data link layer: Frame

  • Data unit on network layer: Packet

  • Data unit on transport layer: Segment

  • What the Ping command does?: Tests if a device on a network is reachable

  • Command used to manage IP assigned to a machine: Ipconfig

  • Which layer does Hub work in?: Physical layer. 

  • Which layer does Switch work in?: Data link layer

  • Which layer does Router work in?: Network layer

  • Function of the Data link layer: Provides error detection and correction.

  • Category 5e UTP cable usage: Ethernet. 

  • Maximum length of a UTP cable: 100 meters

  • Maximum length of a coaxial cable: 500 meters.

  • Maximum length of a fiber optic cable: 2 kilometers

  • Cable not affected by electromagnetic interference: Fiber optic cable. 

  • Principle in optical fiber transmission: Total internal reflection.

  • Commonly used unit for measuring data transmission speed: bits per second (bps)

  • Omnidirectional wave types: Radio waves, Microwaves and Infrared waves

  • Directional properties of waves : Microwaves and Infrared waves

  • Characteristics of wire network vs Wifi?: Wifi network is portable, more secure, and faster while the wire network is more stable and easier to control.

  • Different types of wireless and wired networks: PAN (personal area network), LAN (local area network), MAN (metropolitan area network) and WAN (wide area network) along with Wired networks (ethernet cables).

  • Different network protocols and layers: HTTP, SMTP, FTP, IP, TCP, UDP are some network protocols of layers.

  • Difference between wired and wireless network : Network mobility, security, speed (Wired is faster than Wi-Fi)

  • Method to combine multiple signals into a single signal: Multiplexing

  • Method to reverse a combined signal into separate signals: Demultiplexing.

  • OSI model layer responsible for data error correction: Data link layer

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Computer Network Past Paper 2021-2022 PDF

Description

Test your knowledge on fundamental concepts of computer networks with this comprehensive exam covering OSI and TCP/IP models, network types, and key components. This multiple-choice quiz draws from a database of 200 questions to challenge your understanding. Perfect for students at the University of Information Technology and Communication.

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