Computer Networks Lecture 1: Introduction and Application Layer

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30 Questions

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

Network edge

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

Network layer

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

A set of rules governing the exchange of data between devices

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

Connecting end systems to the first router

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

Link layer

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

A network of networks

What are the components of the Internet?

Network edges, protocols, and applications

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

Laptops and smartphones

What is the transmission rate of a link measured in?

Megabits/second

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

The sending end system segments the data and adds packets

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

Routers

What is a packet switch?

A device used to forward packets from one network to another

Which physical media can be used for communication links?

Satellite and radio spectrum

What are examples of network edges?

End-systems and applications

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

Wide Area Network

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

450 Mbps

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

3G

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

Wide-area wireless networks have a coverage of 1-5 km.

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

To provide network coverage within 1-5 km.

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

Wireless LANs

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

1-10 Mbps

Which type of physical media allows signals to propagate freely?

Electro-magnetic radio waves

What is the primary characteristic of circuit switching?

Dedicated communication path

Which method involves dividing data into smaller units called packets?

Packet switching

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

Electricity (electron format)

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

$10 Gbps$

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

Obstruction by objects and interference

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

Fiber optic cable

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

Circuit switching

What is the primary characteristic of fiber optic cable?

$10-100 Gbps$ transmission rate

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.

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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