Computer Networks Lecture 1: Introduction and Application Layer
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Questions and Answers

What is the primary focus of the book 'Computer Networking: A Top Down Approach'?

  • Physical media
  • Network edge (correct)
  • Internet history
  • Service models

    • Which layer of the Internet is concerned with packet/circuit switching and Internet structure?

  • Network layer (correct)
  • Application layer
  • Transport layer
  • Link layer

    • What does the term 'protocol' refer to in the context of computer networks?

  • Network edge
  • Internet history
  • A set of rules governing the exchange of data between devices (correct)
  • Service models

    • What is the primary function of access networks in the context of computer networking?

    <p>Connecting end systems to the first router</p> Signup and view all the answers

    In computer networking, which aspect is associated with performance concerns such as loss, delay, and throughput?

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

    According to the provided text, what is the Internet described as?

    <p>A network of networks</p> Signup and view all the answers

    What are the components of the Internet?

    <p>Network edges, protocols, and applications</p> Signup and view all the answers

    Which devices are considered as non-traditional computing devices connected to the Internet?

    <p>Laptops and smartphones</p> Signup and view all the answers

    What is the transmission rate of a link measured in?

    <p>Megabits/second</p> Signup and view all the answers

    What happens when one end system has data to send to another end system?

    <p>The sending end system segments the data and adds packets</p> Signup and view all the answers

    Which devices are typically used for forwarding packets between different networks?

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

    What is a packet switch?

    <p>A device used to forward packets from one network to another</p> Signup and view all the answers

    Which physical media can be used for communication links?

    <p>Satellite and radio spectrum</p> Signup and view all the answers

    What are examples of network edges?

    <p>End-systems and applications</p> Signup and view all the answers

    What does WAN stand for in the context of the Internet?

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

    What is the typical transmission rate offered by the 802.11 (WiFi) protocol for wireless LANs?

    <p>450 Mbps</p> Signup and view all the answers

    Which technology is commonly used in Wide-area wireless or cellular networks to offer between 1 and 10 Mbps?

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

    What is the primary difference in network coverage between Wireless LANs and Wide-area wireless networks?

    <p>Wide-area wireless networks have a coverage of 1-5 km.</p> Signup and view all the answers

    What is the primary function of Global System for Mobile communication (GSM) in the context of wireless networks?

    <p>To provide network coverage within 1-5 km.</p> Signup and view all the answers

    Which type of network typically uses the 802.11 (WiFi) protocol for data transmission?

    <p>Wireless LANs</p> Signup and view all the answers

    What is the average transmission rate offered by Wide-area wireless networks using 3G, 4G, or 5G technologies?

    <p>1-10 Mbps</p> Signup and view all the answers

    Which type of physical media allows signals to propagate freely?

    <p>Electro-magnetic radio waves</p> Signup and view all the answers

    What is the primary characteristic of circuit switching?

    <p>Dedicated communication path</p> Signup and view all the answers

    Which method involves dividing data into smaller units called packets?

    <p>Packet switching</p> Signup and view all the answers

    What is the primary transmission format of data in coaxial cable?

    <p>Electricity (electron format)</p> Signup and view all the answers

    What is the transmission rate of Category 6 twisted pair copper?

    <p>$10 Gbps$</p> Signup and view all the answers

    What is the major disadvantage of electro-magnetic radio waves?

    <p>Obstruction by objects and interference</p> Signup and view all the answers

    In which type of physical media does signal transmission occur through glass fiber carrying light pulses?

    <p>Fiber optic cable</p> Signup and view all the answers

    Which method involves the establishment of a dedicated communication path between two devices before data transmission begins?

    <p>Circuit switching</p> Signup and view all the answers

    What is the primary characteristic of fiber optic cable?

    <p>$10-100 Gbps$ transmission rate</p> Signup and view all the answers

    Study Notes

    Book Overview

    • The primary focus of the book 'Computer Networking: A Top Down Approach' is on the Internet and its networks.

    Internet Architecture

    • The Network Layer is concerned with packet/circuit switching and Internet structure.
    • The Internet is described as a network of networks.

    Components of the Internet

    • The components of the Internet include Access Networks, Network Core, and Network Edges.

    Access Networks

    • The primary function of access networks is to connect devices to the Internet.

    Performance Concerns

    • The primary aspect associated with performance concerns such as loss, delay, and throughput is Network Core.

    Protocols

    • A protocol refers to a set of rules and standards that govern data communication between devices in a network.

    Data Transmission

    • When one end system has data to send to another end system, it breaks the data into packets and transmits them through the network.
    • Packet-switching devices, such as routers, are used for forwarding packets between different networks.

    Packet Switching

    • A packet switch is a device that forwards packets between different networks.
    • The transmission rate of a link is measured in bits per second (bps).
    • Physical media that can be used for communication links include Twisted Pair Copper, Coaxial Cable, Fiber Optic Cable, and Radio Waves.
    • Coaxial cable transmits data in analog format.

    Network Edges

    • Examples of network edges include homes, offices, and mobile devices.

    Non-Traditional Computing Devices

    • Non-traditional computing devices connected to the Internet include smartphones, tablets, and laptops.

    Wireless Networks

    • WAN stands for Wide Area Network.
    • The 802.11 (WiFi) protocol is commonly used in Wireless LANs, offering a typical transmission rate of up to 100 Mbps.
    • Wide-area wireless networks, such as cellular networks, use technologies like GSM and offer transmission rates between 1 and 10 Mbps.
    • The primary difference in network coverage between Wireless LANs and Wide-area wireless networks is the coverage area.
    • Wireless LANs use the 802.11 (WiFi) protocol for data transmission.

    Transmission Rates

    • The average transmission rate offered by Wide-area wireless networks using 3G, 4G, or 5G technologies is up to 100 Mbps.
    • The transmission rate of Category 6 twisted pair copper is up to 1 Gbps.

    Physical Media

    • Radio waves are a type of physical media that allow signals to propagate freely.
    • Fiber optic cable is a type of physical media that transmits data through glass fiber carrying light pulses.
    • The primary characteristic of fiber optic cable is that it is resistant to electromagnetic interference.

    Circuit Switching

    • The primary characteristic of circuit switching is the establishment of a dedicated communication path between two devices before data transmission begins.
    • Circuit switching is a method that involves the establishment of a dedicated communication path between two devices before data transmission begins.

    Packet Switching

    • Packet switching is a method that involves dividing data into smaller units called packets.
    • The primary characteristic of packet switching is the transmission of packets through the network without a dedicated communication path.

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    Description

    Test your understanding of the first lecture on computer networks, covering topics from the book 'Computer Networking: A Top Down Approach' by Jim Kurose and Keith Ross. This quiz focuses on Chapter 1: Introduction to computer networks and the Application Layer.

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