十二月 14, 2018

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Chapter 1 : LANs, and WANs (Page 1.2.2.1~1.2.2.3)


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    Mr.PC

    [Types of Networks]

    Network infrastructures can vary greatly in terms of:

     

    • Size of the area covered
    • Number of users connected
    • Number and types of services available
    • Area of responsibility

    The figure illustrates the two most common types of network infrastructures:

    • Local Area Network (LAN) – A network infrastructure that provides access to users and end devices in a small geographical area, which is typically an enterprise, home, or small business network owned and managed by an individual or IT department.
    • Wide Area Network (WAN) – A network infrastructure that provides access to other networks over a wide geographical area, which is typically owned and managed by a telecommunications service provider.

    Other types of networks include:

    • Metropolitan Area Network (MAN) – A network infrastructure that spans a physical area larger than a LAN but smaller than a WAN (e.g., a city). MANs are typically operated by a single entity such as a large organization.
    • Wireless LAN (WLAN) – Similar to a LAN but wirelessly interconnects users and end points in a small geographical area.
    • Storage Area Network (SAN) – A network infrastructure designed to support file servers and provide data storage, retrieval, and replication.

    [Local Area Networks]

    LANs are a network infrastructure that spans a small geographical area. Specific features of LANs include:

    • LANs interconnect end devices in a limited area such as a home, school, office building, or campus.
    • A LAN is usually administered by a single organization or individual. The administrative control that governs the security and access control policies are enforced on the network level.
    • LANs provide high speed bandwidth to internal end devices and intermediary devices.

    [Wide Area Networks]

    WANs are a network infrastructure that spans a wide geographical area. WANs are typically managed by service providers (SP) or Internet Service Providers (ISP).

    Specific features of WANs include:

    • WANs interconnect LANs over wide geographical areas such as between cities, states, provinces, countries, or continents.
    • WANs are usually administered by multiple service providers.
    • WANs typically provide slower speed links between LANs.

     

     

     

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