The correct option is
D. WAN (Wide Area Network).
Explanation of the Correct Answer
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Definition of WAN: A Wide Area Network (WAN) is a telecommunications network that extends over a large geographical area. It can cover cities, countries, or even continents. WANs are used to connect multiple Local Area Networks (LANs) and can span vast distances, often using leased telecommunication lines.
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Characteristics of WAN:
- Geographical Coverage: WANs can connect networks that are far apart, making them suitable for organizations with multiple locations.
- Technology: WANs often use technologies such as MPLS (Multiprotocol Label Switching), satellite links, and leased lines to transmit data over long distances.
- Speed and Bandwidth: While WANs can provide high-speed connections, the speed may vary based on the technology used and the distance between the connected networks.
Why the Other Options Are Incorrect
- A. LAN (Local Area Network):
- Definition: A LAN is a network that connects computers and devices in a limited geographical area, such as a single building or a campus.
- Range: LANs typically cover a small area, usually within a few hundred meters. They are not designed for long-distance communication.
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Conclusion: Since LANs are limited to small areas, they cannot cover the wide range that WANs do.
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B. MAN (Metropolitan Area Network):
- Definition: A MAN is a network that covers a larger area than a LAN but is smaller than a WAN, typically spanning a city or a large campus.
- Range: MANs can cover several kilometers, making them suitable for connecting multiple LANs within a metropolitan area.
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Conclusion: While MANs cover more area than LANs, they still do not reach the extensive range of WANs.
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C. PAN (Personal Area Network):
- Definition: A PAN is a small network, usually within a range of a few meters, designed for personal devices such as smartphones, tablets, and laptops.
- Range: PANs typically cover a very limited area, often just a few meters around an individual.
- Conclusion: PANs are the smallest type of network and are not capable of covering the wide range that WANs can.
Summary of Key Points
- WANs cover the widest geographical area, connecting multiple LANs over long distances.
- LANs are limited to small areas, typically within a single building or campus.
- MANs cover larger areas than LANs but are still confined to metropolitan regions.
- PANs are the smallest networks, designed for personal devices within a very short range.
Revision Summary
- WANs (Wide Area Networks) cover the largest geographical area.
- LANs (Local Area Networks) are limited to small areas, typically within a building.
- MANs (Metropolitan Area Networks) connect networks within a city.
- PANs (Personal Area Networks) are the smallest, covering only a few meters.