Data Communication Course Quiz
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Questions and Answers

What percentage of the overall grade does the final exam contribute?

  • 25%
  • 40% (correct)
  • 15%
  • 30%

Data communication refers only to the exchange of data over wireless connections.

False (B)

Name one textbook used for the course.

Computer Networking: A Top-Down Approach (8th ed.)

The term telecommunication means communication at a ______.

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

Match the following weeks with their respective topics:

<p>Week 2 = Network flow control and congestion control Week 4 = Routing Algorithms Week 6 = Data link layer and MAC address Week 9 = Data Centre Networking</p> Signup and view all the answers

Which of the following is NOT a component of the course content?

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

Which of the following can be considered a node in a network?

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

Attendance for lectures and labs is optional.

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

What does the acronym ARP stand for?

<p>Address Resolution Protocol</p> Signup and view all the answers

A link in a network can only be a physical cable.

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

What are the three key criteria for evaluating a network?

<p>Performance, Reliability, Security</p> Signup and view all the answers

A geometric representation of how computers are connected to each other is known as _____ .

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

Which type of connection allows for multiple recipients of a single transmission?

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

Throughput is a measure of the reliability of a network.

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

Match the following network terminologies with their definitions:

<p>Node = A device capable of sending or receiving data Link = A medium for transporting signals Throughput = Rate of successful data transmission Topology = Arrangement of how devices are interconnected</p> Signup and view all the answers

Reliability in a network is measured in terms of availability and _____ .

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

Which of the following is a disadvantage of ring topology?

<p>Not scalable (A)</p> Signup and view all the answers

A link failure in a ring topology can impact the entire network.

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

What are the three key elements of a protocol?

<p>Syntax, semantics, and timing</p> Signup and view all the answers

The structure or format of the data in a protocol is known as _____ .

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

Match the types of networks with their characteristics:

<p>Local Area Network (LAN) = Short distances Wide Area Network (WAN) = Long distances Metropolitan Area Network (MAN) = City or campus connectivity</p> Signup and view all the answers

What does 'semantics' refer to in the context of a protocol?

<p>The meaning of the bits (D)</p> Signup and view all the answers

Ring topology allows data to travel in both directions between devices.

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

What is one advantage of using ring topology?

<p>Easy installation</p> Signup and view all the answers

Which topology connects each device to every other device in the network?

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

In star topology, devices can communicate directly with each other.

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

What is the main device called in star topology?

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

In bus topology, all devices are connected to a main cable through __________.

<p>drop lines</p> Signup and view all the answers

What is a disadvantage of mesh topology?

<p>Requires a large number of I/O ports (C)</p> Signup and view all the answers

Match the topology with its respective characteristic:

<p>Mesh = Reliable and secure Star = Centralized communication Bus = Main cable connection Ring = Data travels in one direction</p> Signup and view all the answers

Bus topology allows for easy fault detection.

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

What is a major drawback of star topology?

<p>If the hub fails, all communication stops.</p> Signup and view all the answers

Which protocol is known for providing a reliable network service?

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

Connectionless protocols guarantee the order of packet delivery.

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

What is a key characteristic of a reliable connection?

<p>Guaranteed data delivery</p> Signup and view all the answers

The __________ protocol is an example of a connectionless service.

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

Which of the following statements is true regarding connectionless services?

<p>They send data without establishing a connection. (D)</p> Signup and view all the answers

Reliable connections use a three-way handshake for data transmission.

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

What kind of service is provided by connectionless protocols?

<p>Unreliable service</p> Signup and view all the answers

Match the protocols with their characteristics:

<p>TCP = Reliable connection with guaranteed delivery UDP = Connectionless service without delivery guarantee IP = Network layer protocol used for routing HTTP = Protocol for transferring web pages</p> Signup and view all the answers

Which of the following protocols operate at the transport layer?

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

In a client-server architecture, clients can communicate directly with each other.

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

What is the primary purpose of the network layer in the Internet protocol stack?

<p>Routing datagrams from source to destination</p> Signup and view all the answers

The ______________ layer is responsible for the synchronization and recovery of data exchange.

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

Match the following components with their descriptions:

<p>Client = Communicates with the server Server = Always-on host with a permanent IP address Peer = Arbitrary end systems in P2P architecture Connection-oriented protocol = Establishes an end-to-end connection before data transfer</p> Signup and view all the answers

Which architecture is characterized by peers directly communicating with each other?

<p>P2P architecture (C)</p> Signup and view all the answers

The physical layer is responsible for data transfer between neighboring network elements using bits on the wire.

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

What is an example of a protocol that operates at the link layer?

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

In a connection-oriented protocol, a connection must be established between the sender and the __________ before data can be delivered.

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

Which layer of the OSI model would handle encryption and compression of data?

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

Flashcards

Telecommunication

A term that describes communications happening over a distance.

Data

Information in its raw form, ready to be processed or transmitted.

Data Communications

The process of exchanging data between two devices using a medium like a wire cable.

IP (Internet Protocol)

A network layer protocol responsible for forwarding data packets between networks.

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MAC (Media Access Control) Address

A network protocol that transmits data between two directly connected devices.

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What is a Network?

A collection of interconnected devices, like computers and printers, that can send and receive data.

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Network Performance

The speed and efficiency of data transfer within a network.

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Network Reliability

The reliability of the network components and their ability to function without errors.

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Network Security

The protection of data from unauthorized access, corruption, or loss.

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Point-to-Point Connection

A direct connection between two devices, like a phone call between two individuals.

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Multipoint Connection

A connection where one device transmits data to multiple receivers, like a radio broadcast.

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Network Topology

The physical arrangement of devices in a network, showing how they are connected.

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What is meant by geometric representation in Network Topology?

A visual representation of how devices are arranged in a network, illustrating the connections between them.

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Ring Topology

A network configuration where devices are connected in a closed loop, with data flowing in one direction.

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Not scalable

A network setup that is not suitable for handling large numbers of users or devices.

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Data Collision

A situation where two devices try to use the same data address, leading to conflicts and data loss.

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Local Area Network (LAN)

A method for connecting devices within a small geographical area, like an office or home.

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Wide Area Network (WAN)

A method for connecting devices across large geographical distances, connecting cities or continents.

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Metropolitan Area Network (MAN)

A method for connecting devices within a metropolitan area, like a city or campus.

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Protocol

A set of established rules that dictate how data is communicated, including the format, meaning, and timing of communication.

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Syntax (Protocol Element)

The specific arrangement of data bits within a message, determining how the data is read.

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Mesh Topology

Each device is connected to every other device with a dedicated point-to-point link. This means the link only carries data between those two devices.

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Number of Links in Mesh Topology

The number of links in a mesh topology with 'n' devices is calculated as n(n-1)/2. This means as the network grows, the number of links increases rapidly.

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Star Topology

A central device called a hub connects all devices. Data must pass through the hub for communication between any two devices.

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Bus Topology

A single main cable acts as the backbone, and devices connect to it using drop lines. Limited number of devices and distance due to data transmission over the main cable.

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Advantages of Mesh Topology

Data loss is minimal, it's reliable, secure, easy to troubleshoot, and allows fast communication due to dedicated connections.

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Disadvantages of Mesh Topology

Requires extensive wiring, large number of I/O ports per device, and scalability issues as the number of devices increases.

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Advantages of Star Topology

Cost-effective, easier to install, robust, reliable, and simple troubleshooting because of the centralized hub.

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Internet Protocol Stack

The Internet protocol stack arranges network communication into layers. Each layer handles a specific task, like sending bits or routing data packets.

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Transport Layer

The transport layer provides services for data transmission between processes running on different hosts.

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TCP and UDP

Two protocols within the transport layer: TCP and UDP. TCP ensures reliable, ordered data transmission, while UDP is faster but less reliable.

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Network Layer

The network layer is in charge of routing data packets from the source to the destination across networks.

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Link Layer

The link layer handles data transfer between physically connected devices, like a router and a computer.

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Physical Layer

The physical layer defines how bits are transmitted over the physical medium, like electrical signals on a wire.

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Client-Server Architecture

Client-server architecture has a central server that handles requests from multiple clients.

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Peer-to-Peer Architecture

P2P architecture allows peers (devices) to directly communicate with each other without a central server.

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Connection-Oriented Protocol

Connection-oriented protocols establish a dedicated connection between sender and receiver before data transmission.

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Connectionless Protocol

A connectionless protocol doesn't require a prior connection establishment before sending data.

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Handshake Approach

A connection-oriented protocol (like TCP) establishes a secure connection between sender and receiver before data transmission.

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Reliable Network Service

A connection-oriented protocol (like TCP) prioritizes reliable delivery over speed. It ensures data reaches the destination correctly and in the right order.

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Unreliable Network Service

A connectionless protocol (like UDP) prioritizes speed over guaranteed delivery. Data transfer is faster but not guaranteed, so some packets might get lost.

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TCP (Transmission Control Protocol)

This protocol establishes reliable connections, ensures data delivery, prioritizes order, and is used for most internet communication.

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UDP (User Datagram Protocol)

A common connectionless protocol that is faster but less reliable. It is often used for streaming media and online games where some data loss isn't critical.

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Study Notes

Course Information

  • Course Title: CSS313 Advanced Computer Networks
  • Week: 1
  • Topic: Overview of Data Communication Model
  • Semester: Fall 2024
  • Instructor: Eman Sanad
  • Textbooks:
    • Computer Networking: A Top-Down Approach (8th ed.) by J.F. Kurose, K.W. Ross, Pearson, 2020
    • DATA COMMUNICATIONS AND NETWORKING, Fourth Edition, Behrouz A. Forouzan 2007

Course Content

  • Week 1: Overview of data communication model
  • Week 2: Analysis of Network flow control and congestion control mechanisms
  • Week 3: Internet Multicasting, NAT, VPN
  • Week 4: Routing Algorithms – BGP, RIP, OSPF
  • Week 5: MPLS
  • Week 6: Data link layer and MAC address
  • Week 7: ARP protocol
  • Week 8: QoS: Differentiated and Integrated Services
  • Week 9: Data Centre Networking
  • Week 10: Network Function Virtualization -NFV Architecture, Use cases, NFV Orchestration and NFV for 5G
  • Week 11: Cloud Computing infrastructure and services
  • Week 12: IOT, Green Communication Networks

Course Evaluation

  • Midterm: 30%
  • Quizzes: 15% (3 quizzes, 5% each)
  • Lab exam and project: 15%
  • Final Exam: 40%
  • Attendance: Mandatory for lectures and labs

Data Communication

  • Telecommunication: Communication over a distance
  • Data: Information presented in an agreed-upon form
  • Data Communication: Exchange of data between devices via a transmission medium (e.g., wire cable).

Components of a Data Communication System

  • Sender: The entity initiating the transmission
  • Message: The data being transmitted
  • Medium: The channel for transmission (e.g., cable, air)
  • Receiver: The entity receiving the transmission
  • Protocol: Rules governing data communication (e.g., syntax, semantics, timing).

Data Flow Types

  • Simplex: Data flow in one direction only (e.g., mainframe to monitor)
  • Half-duplex: Data flow in both directions, but only one direction at a time (e.g., two stations communicating)
  • Full-duplex: Data flow in both directions simultaneously (e.g., two stations communicating simultaneously)

Networks

  • Network: Set of devices (nodes) connected by communication links
  • Node: A device in a network that can send or receive data
  • Link: A connection between two nodes that can transfer data
  • Network Criteria: Performance, Reliability, Security
    • Performance measured in terms of delay, throughput
    • Reliability Measured as the availability and robustness of the network components
    • Security protects against corruption or data loss from errors or malicious users
  • Physical Structures: Type of Connection (Point-to-Point or Multipoint) and Topology (Mesh, Star, Bus, Ring)

Network Topologies

  • Mesh Topology: Each device connected to every other device with dedicated point-to-point links.
    • Advantages: No data loss, reliable, secure, easy to troubleshoot, fast communication
    • Disadvantages: Complex Wiring, costly to install, high no of I/O ports
  • Star Topology: All devices connect to a central device (hub).
    • Advantages: Less expensive, Easier to install, Cost-effective, Robust, Easy troubleshooting, Reliable
    • Disadvantages: Hub failure impacts entire network, Hub needs resources and maintenance, not scalable
  • Bus Topology: Single main cable with all devices connected via drop lines.
    • Advantages: Easy installation, Less expensive, Limited failure
    • Disadvantages: Difficult fault detection, not scalable, difficult to troubleshoot, data collision
  • Ring Topology: Devices connected in a closed loop.
    • Advantages: Easy to install, less expensive, easy maintenance
    • Disadvantages: Link failure impacts the whole network, Data traffic issues

Networks Categories

  • Local Area Network (LAN): Designed for short distances and local interconnectivity
  • Wide Area Network (WAN): Designed for long distances and connectivity over large areas
  • Metropolitan Area Network (MAN): Designed for connectivity over areas like cities

Protocols

  • Protocol: Set of rules governing data communication (syntax, semantics, timing).
    • Syntax: Structure/format of data
    • Semantics: Meaning of the data
    • Timing: When data should be sent and speed

Internet Protocol Stack

  • Application Layer: Supporting network applications (FTP, SMTP, HTTP).
  • Transport Layer: Process-to-process data transfer (TCP, UDP).
  • Network Layer: Routing of data from source to destination (IP, routing protocols).
  • Link Layer: Data transfer between neighbouring network elements (Ethernet, 802.11, PPP).
  • Physical Layer: Transmission of bits (on the wire).

ISO/OSI Reference Model

  • OSI model describes the networking framework. It has layers.
    • Presentation Layer: Handles interpretation and conventions of data.
    • Session Layer: Handles synchronization and recovery of sessions
    • The internet stack lacks these layers (which must be implemented in the application if needed).

Application Architectures

  • Client-Server: A server provides service to clients
    • Server: Always-on host, permanent IP, data centers for scaling
    • Client: Communicates with server, may be intermittently connected, may have dynamic IPs
  • Peer-to-Peer (P2P): Arbitrary end systems communicate directly
    • No always-on server, peers request service from other peers
    • Self-scalable, new peers bring new service capacity and demands

TCP

  • Connection-oriented protocol used to send data reliably over a network.
  • Employs a handshake to establish a connection before transmitting the data.
  • Guarantees the data packets reach in the same order and are not lost.

UDP

  • Connectionless protocol used to send data quickly over a network.
  • No need for connection establishment
  • No guarantee is provided that the data packet will be reliably transmitted and delivered.
  • Data loss and wrong sequencing/order are possible.

Reliable and Unreliable Connections

  • Comparing TCP (reliable) and UDP (unreliable) transmission performance.
  • reliable connection with guarantees at a cost of higher latency

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CSS313 Advanced Computer Networks Course Notes PDF

Description

Test your knowledge on key concepts related to the Data Communication course. This quiz covers important topics including network components, telecommunications terminology, and evaluation criteria for networks. Perfect for students preparing for their final exam or those looking to brush up on their skills.

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