網路原理(一) Section 1.2

broadband cable
寬頻傳輸電纜
broadband is wide bandwidth data transmission which transports multiple signals and traffic types. The medium can be coaxial cable, optical fiber, radio or twisted pair.(wikipedia)

broadband DSL
寬頻傳輸數位用戶迴路，Digital Subscriber Line，是通過銅線或者本地電話網提供數位連接的一種技術。

business 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.

cable
電纜
 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.

cellular
Cellular Internet access uses a cell phone network to connect.

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.
(dedicated : 專用, leased : 租用) 

dial-up telephone
電話撥號連線
 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.

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.

 end devices
終端設備。例如我們常使用的手機、電腦。

extranet 
組織在Internet上架構好WWW系統後，凡在防火牆(firewall)內的就是Intranet，在外的就是Extranet。
An organization may use an extranet to provide secure and safe access to individuals who work for a different organization, but require access to the organization’s data.

hardware
硬體

intermediary devices
中繼媒體設備建立連線並確保資料能夠傳輸。
Intermediary devices connect the individual end devices to the network and can connect multiple individual networks to form an internetwork.

internetworking devices
互聯網連線設備
跟intermediary device很像

Internet Service Provider (ISP)
網際網路服務供應商，例如HiNet。

Intranet
內部網路，例如公司網路

leased lines
租用線

Local Area Network (LAN)
局域網，家裡的電腦通常就是在一個LAN底下

logical topology diagrams
Identify devices, ports, and addressing scheme.

medium
中介
Communication across a network is carried on a medium. The medium provides the channel over which the message travels from source to destination.

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.

metro Ethernet
A metropolitan-area Ethernet, Ethernet MAN, or metro Ethernet network is a metropolitan area network (MAN) that is based on Ethernet standards.

network access devices
網路存取設備

network interface card (NIC)
網路介面卡 (網卡)

network media
Modern networks primarily use three types of media to interconnect devices and to provide the pathway over which data can be transmitted. 例如:光纖

physical port, interface
physical port :
      A connector or outlet on a networking device where the media is connected to an end device or another networking device.
interface :
      Specialized ports on a networking device that connect to individual networks. Because routers are used to interconnect networks, the ports on a router are referred to as network interfaces.

physical topology diagrams
A connector or outlet on a networking device where the media is connected to an end device or another networking device.

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.

security devices
安全設備

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

software
軟體

Storage Area Network
A network infrastructure designed to support file servers and provide data storage, retrieval, and replication.

TelePresence endpoint
視訊終端設備

teleworkers
意思就是remote workers

topology diagram
拓樸圖

VoIP phones
IP電話通過把語音信號經過數字化處理、壓縮編碼打包、透過網路傳輸、然後解壓、把數字信號還原成聲音，讓通話對方聽到。

Wide Area Network (WAN)
廣域網，用以連結各個LAN。

Wireless LAN (WLAN)
Similar to a LAN but wirelessly interconnects users and end points in a small geographical area.