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Questions and Answers
What is a key advantage of wireless computing systems?
What is a key advantage of wireless computing systems?
Which technology is not mentioned in the context of wireless computing systems?
Which technology is not mentioned in the context of wireless computing systems?
What is a characteristic of distributed computing systems?
What is a characteristic of distributed computing systems?
Which feature is not an advantage of distributed computing systems?
Which feature is not an advantage of distributed computing systems?
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What aspect does a wireless application protocol (WAP) relate to within the context of wireless technologies?
What aspect does a wireless application protocol (WAP) relate to within the context of wireless technologies?
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Which technology is associated with a radio-router in the context of wireless networks?
Which technology is associated with a radio-router in the context of wireless networks?
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What does a multihop wireless network involve?
What does a multihop wireless network involve?
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What type of communication technologies do wireless computing systems use for interconnecting computer systems?
What type of communication technologies do wireless computing systems use for interconnecting computer systems?
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Which technology is NOT mentioned in the context of wireless computing systems in the provided text?
Which technology is NOT mentioned in the context of wireless computing systems in the provided text?
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What configuration enables the sharing of hardware and software resources among several users sitting far away from each other?
What configuration enables the sharing of hardware and software resources among several users sitting far away from each other?
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What is a key advantage of multihop wireless networks mentioned in the text?
What is a key advantage of multihop wireless networks mentioned in the text?
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What technology is associated with Wireless Local Loop (WLL) in the context of wireless technologies?
What technology is associated with Wireless Local Loop (WLL) in the context of wireless technologies?
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In distributed computing systems, what does the term 'extensibility' refer to?
In distributed computing systems, what does the term 'extensibility' refer to?
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What characteristic of wireless computing systems leads to higher reliability as mentioned in the text?
What characteristic of wireless computing systems leads to higher reliability as mentioned in the text?
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Which technology is NOT listed as one of the advantages of distributed computing systems?
Which technology is NOT listed as one of the advantages of distributed computing systems?
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Study Notes
Basic Elements of a Communication System
- A communication system consists of a sender (source), medium, and receiver (sink)
- The sender creates and sends a message
- The medium carries the message
- The receiver receives the message
Data Transmission Modes
- Simplex: Sender sends, receiver receives
- Half-duplex: Sender sends, receiver receives, and vice versa
- Full-duplex: Sender and receiver send and receive simultaneously
Data Transmission Speed
- Bandwidth: range of frequencies available for data transmission, affecting data transmission rate
- Baud: unit of measurement of data transfer, measured in bits per second (bps)
- Transmission speed categories:
- Narrowband: sub-voice grade channels, 45-300 baud, used for telegraph lines and low-speed terminals
- Voiceband: voice grade channels, up to 9600 baud, used for ordinary telephone voice communication and slow I/O devices
- Broadband: high-speed channels, up to 1 million baud or more, used for high-speed computer-to-computer communication and simultaneous data transmission
Data Transmission Media
- Commonly used media:
- Twisted-pair wire (UTP cable)
- Coaxial cable
- Microwave system
- Communications satellite
- Optical fibers
Network Topologies
- Term network topology refers to the way nodes are linked together
- Four major topologies:
- Star network
- Ring network
- Completely connected network
- Multi-access bus network
Star Network
- Consists of a host node connected to multiple nodes
Ring Network
- Nodes are connected in a circular configuration
Completely Connected Network
- Each node is connected to every other node
Multi-Access Bus Network
- Computers (nodes) share a single communication line
Hybrid Network
- Combines two or more network topologies
- Examples: ring-star and star-bus topologies
Network Types
- Local Area Network (LAN):
- Limited geographic coverage
- Higher data transmission rate
- Fewer data transmission errors
- Lower data communication cost
- Typically owned by a single organization
- Wide Area Network (WAN):
- Covers a larger geographic area
- Slower data transmission rate
- More data transmission errors
- Higher data communication cost
- Can be owned by multiple organizations
- Metropolitan Area Network (MAN):
- Shares characteristics of LANs and WANs
Network Interface Card (NIC)
- Hardware device that connects a computer to a network
- Provides a port for network cable attachment
Internetworking
- Interconnecting two or more networks to form a single network
- Goal: to hide details of different physical networks, creating a single coordinated unit
- Tools: bridges, routers, brouters, and gateways
- The Internet is the best example of an internetwork
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Description
Explore the differences between Local Area Networks (LAN) and Wide Area Networks (WAN) in terms of geographic coverage, transmission rate, data errors, and communication cost.
