Network Types and Characteristics

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Networks are categorized by their geographical reach and purpose, such as Personal Area Network (PAN) and Local Area Network (LAN).

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Types of networks based on geographical reach and purpose.

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A PAN is a computer network used for data transmission among devices, such as computers, smartphones, and personal digital assistants (PDAs), located close to a single user.

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Definition of Personal Area Network (PAN).

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A LAN connects computers and other devices within a limited geographical area, such as a school, office building, or a home.

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Definition of Local Area Network (LAN).

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A PAN typically covers a range of a few meters.

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Typical range of a Personal Area Network (PAN).

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A LAN can be wired (e.g., Ethernet) or wireless (WLAN, Wi-Fi).

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Connectivity options for a Local Area Network (LAN).

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Construction of Copper Cables

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Typically consist of multiple twisted pairs of copper wires, often shielded.

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Security comparison between wired and wireless networks

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Wired networks are more secure as they are harder to intercept physically, while wireless networks are less secure due to easier signal interception.

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Noise in data transmission refers to unwanted electrical or electromagnetic signals that interfere with the transmitted data signal. These can be caused by electronic devices, power lines, or atmospheric conditions.

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Noise can disrupt the accuracy of data transmission, making it harder for the receiver to interpret the signal correctly.

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Distortion occurs when the shape or form of the signal changes during transmission, making it difficult for the receiver to interpret the data correctly.

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Distortion can lead to errors in data interpretation, affecting communication accuracy.

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Steps in echo check error detection: 1. The sender transmits a block of data. 2. The receiver sends an identical copy of the data back to the sender. 3. The sender compares the returned data with the original data.

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If the two copies match, the data is assumed to be transmitted correctly. If they do not match, an error is detected, and the sender retransmits the data.