Computer Networks 1 Quiz
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Questions and Answers

What type of ISP provides internet services to a specific geographical area?

  • Local ISP (correct)
  • National ISP
  • Regional ISP
  • Global ISP
  • Which type of ISP provides internet services to a large geographical area, often spanning multiple cities or states?

  • Regional ISP (correct)
  • Local ISP
  • National ISP
  • Global ISP
  • What type of ISP provides internet services to a country or large region?

  • Regional ISP
  • National ISP (correct)
  • Global ISP
  • Local ISP
  • Which type of ISP provides internet services globally?

    <p>Global ISP</p> Signup and view all the answers

    What is the primary function of an ISP?

    <p>To provide internet access to customers</p> Signup and view all the answers

    What is an example of a type of network that an ISP might provide access to?

    <p>All of the above</p> Signup and view all the answers

    What is the Internet often viewed as?

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

    What type of network is often used to provide internet access to a specific geographical area?

    <p>Local network</p> Signup and view all the answers

    What is the primary function of a national ISP?

    <p>To provide internet access to a country or large region</p> Signup and view all the answers

    What type of ISP is often used to provide internet access to a large geographical area?

    <p>Regional ISP</p> Signup and view all the answers

    Study Notes

    Physical Layer Technologies

    • Fiber optic cable has the highest transmission rate and lowest bit error rate in practice.

    Jargon and Abbreviations

    • Nuts and bolts: the basic practical details.
    • HTTP: HyperText Transfer Protocol.
    • Wi-Fi: actually IEEE 802.11, but a marketing firm suggested the name Wi-Fi which resembles Hi-Fi.
    • There are many types of Wi-Fi: b, a, g, n, ac (wave 1,2), ax.
    • TCP: Transmission Control Protocol.
    • IP: Internet Protocol.
    • ISP: Internet Service Provider.
    • IETF: Internet Engineering Task Force.
    • RFC: Request for Comments.
    • IEEE: Institute of Electrical and Electronics Engineers.
    • IoT: Internet of Things.
    • DSL: Digital Subscriber Line.
    • ADSL: Asymmetric DSL.

    Access Networks

    • Residential access networks.
    • Institutional access networks (school, company).
    • Mobile access networks (Wi-Fi, 4G/5G).

    Digital Subscriber Line (DSL)

    • Uses existing telephone line to central office DSLAM.
    • Data over DSL phone line goes to the Internet.
    • Voice over DSL phone line goes to the telephone network.
    • 24-52 Mbps dedicated downstream transmission rate.
    • 3.5-16 Mbps dedicated upstream transmission rate.

    Home Networks

    • Wireless and wired devices.
    • Often combined in a single box.
    • Cable or DSL modem.
    • WiFi wireless access point (54, 450 Mbps).
    • Wired Ethernet (1 Gbps).
    • Router, firewall, NAT.

    Wireless Access Networks

    • Shared wireless access network connects end system to router.
    • Via base station aka “access point”.
    • Wireless local area networks (WLANs) typically within or around a building (~30 m).
    • 802.11b/g/n (WiFi): 11, 54, 450 Mbps transmission rate.
    • Wide-area cellular access networks provided by mobile, cellular network operator (10’s km).
    • 10’s Mbps transmission rate.

    Enterprise Networks

    • Companies, universities, etc.
    • Enterprise link to ISP (Internet).
    • Institutional router.
    • Ethernet switch.
    • Institutional mail, web servers.
    • IEEE: Institute of Electrical and Electronics Engineers.
    • WiFi.

    The Internet: A “Services” View

    • Infrastructure that provides services to applications.
    • Provides programming interface to distributed applications.
    • “Hooks” allowing sending/receiving apps to “connect” to, use Internet transport service.
    • Provides service options, analogous to the postal service.

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    Description

    A quiz on physical layer technologies in computer networks, comparing transmission rates and bit error rates of different technologies.

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