Computer Networking Chapter 1 Quiz
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Computer Networking Chapter 1 Quiz

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Questions and Answers

What are the end systems in a network?

  • Routers and switches
  • PCs and mobile devices (correct)
  • Applications and protocols
  • Fiber and copper links
  • Which of the following best describes packet switches?

  • Routers that store data packets indefinitely
  • Devices that forward packets of data within a network (correct)
  • End systems that generate consumer data traffic
  • Devices that connect to the internet via fiber optics
  • Which protocol is NOT typically used for controlling message sending and receiving?

  • IP
  • TCP
  • FTP (correct)
  • HTTP
  • What does the term 'bandwidth' refer to in the context of communication links?

    <p>The maximum rate at which data can be transmitted</p> Signup and view all the answers

    Which statement about Internet standards is accurate?

    <p>RFC documents guide technical standards for the Internet</p> Signup and view all the answers

    What is the primary function of protocols in a network?

    <p>To define the format and order of messages.</p> Signup and view all the answers

    What is an example of human protocols mentioned in the content?

    <p>Getting the time.</p> Signup and view all the answers

    Which component is NOT part of the network edge?

    <p>Interconnected routers.</p> Signup and view all the answers

    What does the term 'network core' refer to?

    <p>Interconnected routers and a network of networks.</p> Signup and view all the answers

    Which of the following describes access networks?

    <p>They connect end systems to edge routers.</p> Signup and view all the answers

    Study Notes

    Introduction to Computer Networking

    • The book is titled "Computer Networking: A Top-Down Approach" by Jim Kurose and Keith Ross.
    • It's the 6th edition, published by Addison-Wesley in March 2012.
    • The authors' intent was to share PowerPoint slides freely with educators, students, and readers.
    • Modifications, additions, and deletions are encouraged.
    • The ppt slides are adapted, and if they are used or posted online, the source must be credited.

    Chapter 1 Roadmap

    • 1.1 What is the Internet?
    • 1.2 Network Edge: Includes end systems, access networks, and links.
    • 1.3 Network Core: Focuses on packet switching, circuit switching, and network structure.
    • 1.4 Delay, Loss, Throughput in Networks: Discusses network performance issues.
    • 1.5 Protocol Layers, Service Models: Explores protocol layering and service models.
    • 1.6 Networks Under Attack: Security: Covers network security.
    • 1.7 History: Provides historical context.

    What's the Internet: "nuts and bolts" view

    • The Internet is a network of networks.
    • It consists of interconnected internet service providers (ISPs).
    • Communication protocols (e.g., TCP, IP, HTTP) dictate how messages are sent and received.
    • Internet standards are defined by RFCs and developed by the IETF.

    What's the Internet: "a service view"

    • The Internet infrastructure provides services to applications.
    • Applications like web, VoIP, email, games, and e-commerce utilize this infrastructure.
    • Applications communicate via a programming interface that connects them to the Internet, similar to a postal service.

    What's a Protocol?

    • Protocols define message formats, transmission order, and actions network entities take upon message transmission and receipt.
    • Human protocols (e.g., greetings, questions) are equivalent to computer network protocols.

    A Closer Look at Network Structure

    • Network Edge: Comprises hosts, clients, and servers.
    • Access Networks: Includes physical media such as wired and wireless communication links.
    • Network Core: Formed by interconnected routers that work as a network of networks.

    Access Networks and Physical Media

    • Access networks connect end systems to edge routers.
    • Types of access networks include residential, institutional, and mobile networks.
    • The relevant physical media include wired, wireless, fiber optic cables, and radio.

    Access Networks: DSL

    • Digital subscriber line (DSL) uses existing telephone lines.
    • Data and voice are sent over different frequencies over the phone line.
    • Typical downstream rates are 24 Mbps, while upstream rates are typically < 2.5 Mbps.

    Access Networks: Cable

    • Cable networks use frequency division multiplexing.
    • Cable modems transmit data and TV signals over shared cable lines.
    • HFC (Hybrid Fiber Coax) combines fiber and coaxial cable for high-speed transmission.

    Access Networks: Home Network

    • Home networks combine wireless and wired devices often in a single box.
    • Wireless access points, routers, firewalls, and NAT devices help connect to the Internet.
    • Wired Ethernet has a 100 Mbps transmission rate.

    Access Networks: Enterprise Ethernet

    • Ethernet is commonly used in companies and universities.
    • Transmission rates vary from 10 Mbps to 10 Gbps.
    • Various end systems often connect to Ethernet switches within enterprises.

    Wireless Access Networks

    • Wireless access networks connect end systems to routers via base stations or access points.
    • Wireless LANs often use 802.11 protocols (WiFi).
    • Wide-area wireless access uses technologies like 3G, 4G (LTE).

    Host: Sends Packets of Data

    • A host breaking an application message into smaller packets of data.
    • Packet length (L) and link bandwidth (R) determine transmission delay.

    Physical Media

    • Physical media include twisted-pair, coaxial cable, fiber optic cable, and radio.
    • Guided media involves signals traveling along a physical path, while unguided media allows signals to propagate freely in the air.
    • Characteristics of each physical medium include speed or capacity and the environment in which they use.

    Packet Loss

    • Packet loss occurs when buffers in a router are full.
    • Packets arrive at a rate exceeding the output link's capacity, leading to dropping packets.

    Throughput

    • Throughput is the rate at which bits are transferred between a sender and receiver.
    • Instantaneous throughput is the rate at a specific point in time, while average throughput is over a longer time period.

    Throughput: Internet Scenario

    • End-to-end throughput depends on the bottleneck link's capacity and other factors, which are shown in an illustrative diagram.

    "Real" Internet Delays and Routes

    • Traceroute is a program that measures delays and shows the path packets take through the Internet.
    • Traceroute traces a path from source to destination, showing delays at each router.

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    Description

    Test your knowledge on the key concepts from Chapter 1 of 'Computer Networking: A Top-Down Approach'. This chapter covers the Internet's structure, network edge and core, performance issues, protocol layers, security concerns, and a brief history. Perfect for students wanting to solidify their understanding of introductory networking topics.

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