五月 22, 2018

Main 討論群 電腦技術專區 CCNA CCNA 教材 English Chapter 1 : Explore the Network Section 1.2 : LANs, WANs, and the Internet Chapter 1 : Internet Connections (Page 1.2.4.1~1.2.4.5)

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Chapter 1 : Internet Connections (Page 1.2.4.1~1.2.4.5)


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    [Internet Access Technologies]

    There are many different ways to connect users and organizations to the Internet.

    Home users, teleworkers (remote workers), and small offices typically require a connection to an Internet Service Provider (ISP) to access the Internet. Connection options vary greatly between ISP and geographical location. However, popular choices include broadband cable, broadband digital subscriber line (DSL), wireless WANs, and mobile services.

    Organizations typically require access to other corporate sites and the Internet. Fast connections are required to support business services including IP phones, video conferencing, and data center storage.

    Business-class interconnections are usually provided by service providers (SP). Popular business-class services include business DSL, leased lines, and Metro Ethernet.

    [Home and Small Office Internet Connections]

    The figure illustrates common connection options for small office and home office users:

    • Cable – Typically offered by cable television service providers, the Internet data signal is carried on the same cable that delivers cable television. It provides a high bandwidth, always on, connection to the Internet.
    • DSL – Digital Subscriber Lines provide a high bandwidth, always on, connection to the Internet. DSL runs over a telephone line. In general, small office and home office users connect using Asymmetrical DSL (ADSL), which means that the download speed is faster than the upload speed.
    • Cellular – Cellular Internet access uses a cell phone network to connect. Wherever you can get a cellular signal, you can get cellular Internet access. Performance will be limited by the capabilities of the phone and the cell tower to which it is connected.
    • Satellite – The availability of satellite Internet access is a real benefit in those areas that would otherwise have no Internet connectivity at all. Satellite dishes require a clear line of sight to the satellite.
    • Dial-up Telephone – An inexpensive option that uses any phone line and a modem. The low bandwidth provided by a dial-up modem connection is usually not sufficient for large data transfer, although it is useful for mobile access while traveling.

    Many homes and small offices are more commonly being connected directly with fiber optic cables. This enables an ISP to provide higher bandwidth speeds and support more services such as Internet, phone, and TV.

    The choice of connection varies depending on geographical location and service provider availability.

    [Businesses Internet Connections]

    Corporate connection options differ from home user options. Businesses may require higher bandwidth, dedicated bandwidth, and managed services. Connection options available differ depending on the type of service providers located nearby.

    The figure illustrates common connection options for businesses:

    • Dedicated Leased Line – Leased lines are actually reserved circuits within the service provider’s network that connect geographically separated offices for private voice and/or data networking. The circuits are typically rented at a monthly or yearly rate. They can be expensive.
    • Ethernet WAN – Ethernet WANs extend LAN access technology into the WAN. Ethernet is a LAN technology you will learn about in a later chapter. The benefits of Ethernet are now being extended into the WAN.
    • DSL – Business DSL is available in various formats. A popular choice is Symmetric Digital Subscriber Lines (SDSL) which is similar to the consumer version of DSL, but provides uploads and downloads at the same speeds.
    • Satellite – Similar to small office and home office users, satellite service can provide a connection when a wired solution is not available.

    The choice of connection varies depending on geographical location and service provider availability.

    [Packet Tracer – Help and Navigation Tips]

    Packet Tracer is a fun, take-home, flexible software program which will help you with your Cisco Certified Network Associate (CCNA) studies. Packet Tracer allows you to experiment with network behavior, build network models, and ask “what if” questions. In this activity, you will explore a relatively complex network that highlights a few of Packet Tracer’s features. While doing so, you will learn how to access Help and the tutorials. You will also learn how to switch between various modes and workspaces.

    • Packet Tracer – Help and Navigation Tips Instructions
    • Packet Tracer – Help and Navigation Tips – PKA

    [Packet Tracer – Network Representation]

    • Packet Tracer – Network Representation Instructions
    • Packet Tracer – Network Representation – PKA
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