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Questions and Answers
What is a characteristic of twisted pair cable?
What is a characteristic of twisted pair cable?
Which of the following uses radio waves for communication?
Which of the following uses radio waves for communication?
What is the primary function of a modem?
What is the primary function of a modem?
Which type of signal is used by computers to send and receive information?
Which type of signal is used by computers to send and receive information?
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What distinguishes fiber-optic cable from coaxial cable?
What distinguishes fiber-optic cable from coaxial cable?
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Which technology can transmit data over short distances without requiring a direct line of sight?
Which technology can transmit data over short distances without requiring a direct line of sight?
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Which statement best describes WiFi technology?
Which statement best describes WiFi technology?
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What is a limitation of infrared communication?
What is a limitation of infrared communication?
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What is the purpose of modulation in the context of a modem?
What is the purpose of modulation in the context of a modem?
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Which of the following types of modems uses standard phone lines?
Which of the following types of modems uses standard phone lines?
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What type of cable would be most suitable for high-frequency transmissions such as cable TV?
What type of cable would be most suitable for high-frequency transmissions such as cable TV?
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What is the term for the speed at which data is transferred in a network?
What is the term for the speed at which data is transferred in a network?
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Which of the following devices is likely to use Bluetooth technology?
Which of the following devices is likely to use Bluetooth technology?
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How far can Bluetooth communication typically transmit data?
How far can Bluetooth communication typically transmit data?
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Which technology would primarily utilize satellite connections?
Which technology would primarily utilize satellite connections?
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What is required for computers to communicate across different media?
What is required for computers to communicate across different media?
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What does bandwidth measure in communication networks?
What does bandwidth measure in communication networks?
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Which category of bandwidth is used for standard telephone communication?
Which category of bandwidth is used for standard telephone communication?
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What is the primary function of DNS (Domain Name Server)?
What is the primary function of DNS (Domain Name Server)?
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What is one of the essential features of the TCP/IP protocol?
What is one of the essential features of the TCP/IP protocol?
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What does packetization refer to in the context of internet communication?
What does packetization refer to in the context of internet communication?
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Which type of bandwidth is typically used for DSL and cable connections?
Which type of bandwidth is typically used for DSL and cable connections?
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What role does an IP address play in internet communication?
What role does an IP address play in internet communication?
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Which of the following best describes baseband communication?
Which of the following best describes baseband communication?
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What type of modem uses the same coaxial cable as television?
What type of modem uses the same coaxial cable as television?
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Which technology represents the second generation of mobile telephony?
Which technology represents the second generation of mobile telephony?
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What does 4G indicate about a mobile connection?
What does 4G indicate about a mobile connection?
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Which type of modem is almost universally built into computers today?
Which type of modem is almost universally built into computers today?
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Which of the following represents the fastest mobile internet connection currently available?
Which of the following represents the fastest mobile internet connection currently available?
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What does the 'E' stand for in cellular services terminology?
What does the 'E' stand for in cellular services terminology?
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Which type of modem connects to the system unit using USB or Ethernet port?
Which type of modem connects to the system unit using USB or Ethernet port?
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What does GPRS stand for?
What does GPRS stand for?
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Which network topology connects devices to a common cable known as a bus?
Which network topology connects devices to a common cable known as a bus?
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What is a primary disadvantage of using a Bus Network?
What is a primary disadvantage of using a Bus Network?
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Which network topology uses a direct connection between devices forming a loop?
Which network topology uses a direct connection between devices forming a loop?
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Which of the following is true regarding the efficiency of a Ring Network?
Which of the following is true regarding the efficiency of a Ring Network?
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What describes the physical arrangement of a network?
What describes the physical arrangement of a network?
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Which of the following is a common network strategy for sharing information?
Which of the following is a common network strategy for sharing information?
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What is one advantage of a Bus Network?
What is one advantage of a Bus Network?
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Which network strategy features a centralized server that manages resources?
Which network strategy features a centralized server that manages resources?
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What is the primary function of a firewall in a network?
What is the primary function of a firewall in a network?
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How does a proxy server contribute to network security?
How does a proxy server contribute to network security?
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What role does an Intrusion Detection System (IDS) play in network security?
What role does an Intrusion Detection System (IDS) play in network security?
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What is a key characteristic of a Virtual Private Network (VPN)?
What is a key characteristic of a Virtual Private Network (VPN)?
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What action does a proxy server take with unknown or restricted traffic?
What action does a proxy server take with unknown or restricted traffic?
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In the context of network security, what happens when an IDS identifies a potential attack?
In the context of network security, what happens when an IDS identifies a potential attack?
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What characteristic makes VPN connections appear secure to users?
What characteristic makes VPN connections appear secure to users?
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When implementing network security, which component works alongside the firewall?
When implementing network security, which component works alongside the firewall?
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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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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.
