Communication Systems Overview
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Questions and Answers

What is a characteristic of twisted pair cable?

  • Consists of pairs of copper wires twisted together (correct)
  • Contains a solid copper core
  • Transmits data as pulses of light
  • Can only be used for wireless connections

Which of the following uses radio waves for communication?

  • Coaxial cable
  • Fiber-optic cable
  • Cellular technology (correct)
  • Infrared technology

What is the primary function of a modem?

  • To convert digital signals to analog and vice versa. (correct)
  • To establish a wireless network.
  • To amplify microwave signals.
  • To enhance the speed of internet connections.

Which type of signal is used by computers to send and receive information?

<p>Digital signals (C)</p> Signup and view all the answers

What distinguishes fiber-optic cable from coaxial cable?

<p>Fiber-optic cable offers faster and more reliable data transmission (D)</p> Signup and view all the answers

Which technology can transmit data over short distances without requiring a direct line of sight?

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

Which statement best describes WiFi technology?

<p>Employs high frequency radio signals to transmit data. (B)</p> Signup and view all the answers

What is a limitation of infrared communication?

<p>Obstructions can block the signal (B)</p> Signup and view all the answers

What is the purpose of modulation in the context of a modem?

<p>To convert digital signals to analog. (A)</p> Signup and view all the answers

Which of the following types of modems uses standard phone lines?

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

What type of cable would be most suitable for high-frequency transmissions such as cable TV?

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

What is the term for the speed at which data is transferred in a network?

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

Which of the following devices is likely to use Bluetooth technology?

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

How far can Bluetooth communication typically transmit data?

<p>Approximately 33 feet (C)</p> Signup and view all the answers

Which technology would primarily utilize satellite connections?

<p>Global Positioning System (GPS) (B)</p> Signup and view all the answers

What is required for computers to communicate across different media?

<p>A modem device (D)</p> Signup and view all the answers

What does bandwidth measure in communication networks?

<p>The amount of information that can be transmitted over a channel (A)</p> Signup and view all the answers

Which category of bandwidth is used for standard telephone communication?

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

What is the primary function of DNS (Domain Name Server)?

<p>To convert text-based addresses into IP addresses (D)</p> Signup and view all the answers

What is one of the essential features of the TCP/IP protocol?

<p>Identifying sending and receiving devices (A)</p> Signup and view all the answers

What does packetization refer to in the context of internet communication?

<p>The process of breaking information into small packets (C)</p> Signup and view all the answers

Which type of bandwidth is typically used for DSL and cable connections?

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

What role does an IP address play in internet communication?

<p>It provides a unique identifier for each device on the network (C)</p> Signup and view all the answers

Which of the following best describes baseband communication?

<p>It carries one signal at a time between closely located devices (B)</p> Signup and view all the answers

What type of modem uses the same coaxial cable as television?

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

Which technology represents the second generation of mobile telephony?

<p>2G (C)</p> Signup and view all the answers

What does 4G indicate about a mobile connection?

<p>It offers fast mobile internet connection. (D)</p> Signup and view all the answers

Which type of modem is almost universally built into computers today?

<p>Wireless modem (C)</p> Signup and view all the answers

Which of the following represents the fastest mobile internet connection currently available?

<p>5G (C)</p> Signup and view all the answers

What does the 'E' stand for in cellular services terminology?

<p>Enhanced Data Rates for GSM Evolution (B)</p> Signup and view all the answers

Which type of modem connects to the system unit using USB or Ethernet port?

<p>Both A and B (D)</p> Signup and view all the answers

What does GPRS stand for?

<p>General Packet Radio Service (B)</p> Signup and view all the answers

Which network topology connects devices to a common cable known as a bus?

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

What is a primary disadvantage of using a Bus Network?

<p>Cable damage can disrupt the entire network (D)</p> Signup and view all the answers

Which network topology uses a direct connection between devices forming a loop?

<p>Ring Network (C)</p> Signup and view all the answers

Which of the following is true regarding the efficiency of a Ring Network?

<p>It offers fast data transfer (A)</p> Signup and view all the answers

What describes the physical arrangement of a network?

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

Which of the following is a common network strategy for sharing information?

<p>Peer-to-Peer Network (B)</p> Signup and view all the answers

What is one advantage of a Bus Network?

<p>Simplicity and low cost (C)</p> Signup and view all the answers

Which network strategy features a centralized server that manages resources?

<p>Client Server Network (B)</p> Signup and view all the answers

What is the primary function of a firewall in a network?

<p>To control access to the network (B)</p> Signup and view all the answers

How does a proxy server contribute to network security?

<p>It evaluates and filters communications (C)</p> Signup and view all the answers

What role does an Intrusion Detection System (IDS) play in network security?

<p>It analyzes network traffic for signs of attack (C)</p> Signup and view all the answers

What is a key characteristic of a Virtual Private Network (VPN)?

<p>It creates a secure connection over the internet (B)</p> Signup and view all the answers

What action does a proxy server take with unknown or restricted traffic?

<p>Denies access or restricts it (B)</p> Signup and view all the answers

In the context of network security, what happens when an IDS identifies a potential attack?

<p>It disables access to prevent damage (B)</p> Signup and view all the answers

What characteristic makes VPN connections appear secure to users?

<p>They resemble connections to the corporate network (A)</p> Signup and view all the answers

When implementing network security, which component works alongside the firewall?

<p>Intrusion Detection System (IDS) (C)</p> Signup and view all the answers

Flashcards

WIFI

A wireless network technology that uses high-frequency radio signals to transmit data.

Satellite Connection

A communication method that amplifies and relays microwave signals between ground transmitters.

Analog Signal

A continuous signal that varies over time, like a sound wave.

Digital Signal

A signal that uses discrete values, like 1s and 0s, to represent information.

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Modem

A device that converts digital signals to analog signals (modulation) and vice versa (demodulation).

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Twisted Pair Cable

Consists of pairs of copper wires twisted together, used in telephone lines and Ethernet cables.

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Transfer Rate

The speed at which data is sent and received, usually measured in Mbps (Megabits per second).

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DSL Modem

A type of modem that uses standard phone lines for high-speed internet connections.

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Coaxial Cable

A high-frequency cable with a single copper core, offering higher transmission capacity than twisted pair.

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Fiber-optic Cable

Transmits data as light pulses through glass tubes, offering better speed and reliability.

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Cable Modem

A modem that uses cable lines for connecting to the internet.

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External Modem Types

Modems that connect to a computer system using USB or Ethernet ports.

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Wireless Connection

A connection that uses air rather than a physical cable to transmit data, commonly using radio waves.

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Cellular Connection

A wireless connection using antennas to cover a small geographic area, such as in cell phones.

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Bluetooth

A short-range wireless communication technology (up to about 33 feet).

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Wireless Modem (WMAN)

A wireless modem, also known as WMAN, almost all modern computers have built-in wireless modems.

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Infrared Connection

A short-range wireless connection that uses infrared light waves; devices must be in a direct line of sight.

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GPRS (General Packet Radio Service)

The slowest cellular internet speed, identified by 'G' on signal strength indicators.

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EDGE (Enhanced Data Rates for GSM Evolution)

Faster cellular internet speed than GPRS, but still not ideal for web browsing.

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3G Cellular Technology

Third-generation mobile technology providing a faster internet speed for web browsing and streaming.

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4G Cellular Technology

Fourth-generation mobile technology offering a fast mobile internet connection.

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5G Cellular Technology

Fifth-generation mobile technology, offering the fastest mobile internet connection available.

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Bandwidth

The capacity of a communication channel to transmit information.

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Voice band

Low bandwidth used for standard phone calls.

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Broadband

High bandwidth used for faster data transfer, e.g., DSL, cable.

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HTTPS

Secure protocol for transferring sensitive data.

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TCP/IP

Internet standard for communication rules between computers.

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IP address

Unique numerical address that identifies each computer on the internet.

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DNS

Converts human-readable domain names (like google.com) to IP addresses.

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Packetization

Breaking down information into smaller parts (packets) to transmit over the internet.

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Network Architecture

Describes how a network is structured, including how resources are organized and shared.

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Network Topology

The physical arrangement of devices on a network.

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Bus Network

A network where all devices share a single cable, like a bus.

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Ring Network

Devices are connected in a circle, with data traveling in one direction.

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Star Network

All devices connect to a central hub, like spokes on a wheel.

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Network Strategy

The methods used to share resources and information on a network.

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Client-Server Network

A network where clients request services from a central server.

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Peer-to-Peer Network

Devices can directly communicate with each other without a central server.

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Firewall

A security system (hardware or software) that controls access to a network. It acts like a gatekeeper, filtering incoming and outgoing traffic to block unauthorized access.

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Proxy Server

A server that acts as an intermediary between a client (e.g., your computer) and other servers on the internet. It allows you to connect through a safe and secure channel.

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Intrusion Detection System (IDS)

A security system that analyzes network traffic for suspicious activity, like attacks. It detects potential threats and alerts administrators.

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Virtual Private Network (VPN)

A secure encrypted connection that creates a private channel between a user's device and a network. It allows you to access a network remotely as if you were physically connected.

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What does a firewall do?

A firewall controls network access by filtering incoming and outgoing traffic. It protects a network from unauthorized access and malicious activities.

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How does a proxy server work?

A proxy server acts as an intermediary between a client and other servers. It forwards requests and receives responses, often providing security and privacy.

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What is the purpose of an intrusion detection system?

An IDS monitors network traffic for signs of attacks. It analyzes network activity to identify suspicious patterns and alerts administrators.

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What is a VPN and what does it do?

A VPN creates a secure encrypted connection between a remote device and a network. It allows users to access a network remotely as if they were connected directly.

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Study Notes

Communication Systems

  • Communication systems are electronic systems that transmit data from one location to another.
  • They include sending and receiving devices, connection devices, communication channels, and data transmission specifications.

Communication Channels

  • Communication channels carry data from one computer to another.
  • Channels are categorized as physical connections and wireless connections.

Physical Connections

  • Use a solid medium to connect devices.
  • Examples include twisted-pair cable, coaxial cable, and fiber-optic cable.
  • Twisted-pair cables consist of pairs of copper wire twisted together.
  • Coaxial cables have a solid copper core with a high frequency transmission capacity.
  • Fiber-optic cables transmit data as light pulses through glass tubes and are faster and more reliable.

Wireless Connections

  • Do not use physical media; instead, they use the air.
  • Examples include cell phones, Bluetooth, Infrared, and Wi-Fi.
  • Wireless technology allows communication between nearby devices without physical connection.
  • Cellular networks use multiple antennae to send and receive data in a geographic area.
  • Bluetooth transmits data over short distances (approximately 33 feet).
  • Infrared uses infrared light waves to communicate in a straight line between devices that are in view.
  • Wi-Fi connects devices to a home or business wireless network using high frequency radio signals.
  • Satellite connections use microwave signals to transmit data across long distances.

Connection Devices

  • Modems are modulator-demodulator devices.
  • Modulation converts digital to analog signals.
  • Demodulation converts analog to digital signals.
  • Modems allow digital devices to communicate via different media such as telephone wire, cable lines, and radio waves.
  • Types of modems include DSL (digital subscriber line), cable modems, and wireless modems.
  • DSL uses standard phone lines.
  • Cable modems use coaxial cables.
  • Wireless modems use wireless technologies (like Wi-Fi).

Connection Services

  • Common cellular technologies include GPRS(General Packet Radio Service), EDGE (Enhanced Data Rates for GSM Evolution), 3G, 4G, and 5G.
  • GPRS provides the slowest internet speed.
  • EDGE offers faster speed compared to GPRS.
  • 3G is the third generation of mobile technology that enables browsing and streaming.
  • 4G is the fourth generation that allows faster internet access in mobile phones.
  • 5G is the fifth generation that is the fastest currently.

Bandwidth

  • Bandwidth measures the capacity of a communication channel; how much information can move across the channel in a given time.
  • Categories of bandwidth include voice band (or low bandwidth), medium band, broadband, and baseband.
  • Voice band is used for standard telephone connections.
  • Broadband is widely used for high-speed data transfer via DSL, cable, and satellite connections.
  • Baseband connections link personal computers in close proximity.

Protocols

  • Protocols are communication rules for exchanging data between computers.
  • Examples include HTTPS (Hypertext Transfer Protocol secure), TCP/IP (Transmission Control Protocol/Internet Protocol).
  • HTTPS protects sensitive data.
  • TCP/IP identifies sending and receiving devices and breaks information into packets for internet transmission.

Network Types

  • Network types are formed through wired or wireless technologies and can be sized to suit geographic areas.
  • Types of networks include Personal Area Network (PAN), Local Area Network (LAN), Metropolitan Area Network (MAN), and Wide Area Network (WAN).
  • PAN is within a small area; commonly used for Bluetooth.
  • LAN connects devices in a limited geographic area (e.g. office buildings, colleges).
  • MAN covers a larger area than a LAN and is used to connect office buildings throughout a city
  • WAN connects devices across a large geographic area, commonly used across countries.

Network Architecture

  • Network architecture describes how a network is arranged and how resources are shared.
  • Network topologies include Bus, Ring, Star, Tree, Mesh and Hybrid.
  • Bus network uses a single cable to transmit signals.
  • Ring network connects devices in a circular pattern.
  • Star network connects devices to a central switch.
  • Tree network expands on the star setup with added connections.
  • Mesh network connects devices with multiple paths for data transfer between nodes.
  • Hybrid network combines different network topologies.
  • Network strategies include Client-Server and Peer-to-Peer.
  • Client-Server uses central computers to coordinate and supply services.
  • Peer-to-Peer networks involve equal authority between devices.

Network Security and Technologies

  • Technologies like firewalls, intrusion detection systems (IDS), and virtual private networks (VPNs) provide network security.
  • Firewalls control and filter communication in and out of the network.
  • Intrusion detection systems (IDS) monitor network traffic and look for signs of attacks.
  • VPNs create secure connections between a remote computer and an organization's network.

Organizational Networks

  • Intranet and Extranet networks are supported by internet technologies for organization communication.
  • Intranet is a private network within an organization similar to the internet used for internal communication.
  • Extranet is a private network that connects more than one organization and is used for communication outside of an organization by authorized users.

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Chapter 6 Communication and Networks PDF

Description

Explore the essentials of communication systems, including various transmission methods, devices, and channels. This quiz covers both physical and wireless connections, detailing examples like twisted-pair cables and Wi-Fi technology.

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