廣域網介面是不是wan_什麼是WAN（廣域網）？
廣域網介面是不是wan
A Wide Area Network or WAN is a computer network which ranges over different cities, countries eve continents simply large geographical area. WAN is very popular for different reasons but the internet is a WAN which is the most popular computer network in the world where billions of people use this WAN type network.
Wide Area Network或WAN是一種計算機網路，其範圍跨越不同的城市，國家，甚至從大陸到大洲。 WAN出於各種原因而非常受歡迎，但是Internet是WAN，它是世界上最流行的計算機網路，數十億人使用此WAN型別的網路。
According to size WAN is the largest computer network topology and the comparison against other computer network topologies can be shown below. As we can see WAN is larger than MAN and LAN topologies.
根據大小，WAN是最大的計算機網路拓撲，下面顯示與其他計算機網路拓撲的比較。 我們可以看到，WAN大於MAN和LAN拓撲。
WAN歷史(WAN History)
WAN networks are created in the early days of the computers. In those days WAN networks were used by the academics or scientiests in order to collobration and sharing.
WAN網路是在計算機早期建立的。 當時，學者或科學家使用WAN網路進行協作和共享。
In the old days about 1960’s the WAN networks was consist of circuit-switched telephone lines where the speed was very low about 2400 bps. This means 2400 bits in a second for transmission.
在大約1960年代的過去，WAN網路由電路交換電話線組成，其速度非常低，約為2400 bps。 這意味著每秒2400位用於傳輸。
Then the fiber optic technology and protocols emerged which provided more reliable and more faster connection by using protocols like ATM and Frame Relay.
然後出現了光纖技術和協議，它們通過使用諸如ATM和幀中繼之類的協議提供了更可靠，更快速的連線。
Today WAN uses advanced technologies and protocols like Metro Ethernet and MPLS which provides speed about 40 – 100 Gbps. Also today WAN coverage is very high according to historical WAN.
如今，WAN使用了諸如城域乙太網和MPLS之類的先進技術和協議，它們提供了大約40 – 100 Gbps的速度。 同樣，根據歷史WAN，今天的WAN覆蓋範圍也很高。
WAN連線技術和型別 (WAN Connection Technologies and Types)
WAN is a very generic description of a network type where different technologies and protocols can be used to create WAN networks. Below we will list some technologies which are used to create WAN networks with different speeds, costs, etc.
WAN是對網路型別的非常籠統的描述，其中可以使用不同的技術和協議來建立WAN網路。 下面我們將列出一些用於建立具有不同速度，成本等的WAN網路的技術。
- ATM (Asynchronous Transfer Mode) ATM(非同步傳輸模式)
- Cable Modem 電纜調變解調器
- Dial-up Modem撥號調變解調器
- Digital Subscriber Line數字使用者線
- Fiber-optic Communication光纖通訊
- Frame Relay幀中繼
- ISDN綜合業務數字網
- Leased Line專線
- SD-WAN廣域網
- X.25X.25
- Metro Ethernet 城域乙太網
- MPLSMPLS協議
無線廣域網 (Wireless WAN)
WAN can be created by using different technologies, protocols and as well as transmission mediums to transmit network signals. Wireless WAN is a WAN which consist of wireless devices to transmit data between different points. Wireless WAN can be easily used to transmit data related,, call, web page, streaming video. There are different wireless technologies like 4G, LTE, 5G to form Wireless WAN.
可以使用不同的技術，協議以及傳輸網路訊號的傳輸介質來建立WAN。 無線廣域網是由無線裝置組成的廣域網，用於在不同點之間傳輸資料。 無線廣域網可以輕鬆地用於傳輸與資料相關的資料，例如呼叫，網頁，流視訊。 有多種無線技術(例如4G，LTE，5G)組成無線WAN。
廣域網 (SD-WAN)
SD-WAN is a technology emerged in the recent years which provides easier deployment, operations, manage for the WAN topology. SD-WAN mainly uses the virtualization technology with applications-level policies, overlay networks and onsite SD-WAN devices and software platforms.
SD-WAN是近年來出現的一項技術，可簡化WAN拓撲的部署，操作和管理。 SD-WAN主要將虛擬化技術與應用程式級策略，覆蓋網路以及現場SD-WAN裝置和軟體平臺一起使用。
區域網與廣域網 (LAN vs WAN)
WAN and LAN network topologies generally compared with each other for differencies and similarities. Below we will compere these two network topologies for their different aspects.
WAN和LAN網路拓撲通常相互比較，以區別和相似之處。 下面，我們將針對這兩個網路拓撲的不同方面進行比較。
Even WAN provides more bandwidth than LAN as the bandwidth is used by a lot of users the LAN provides faster connections especially LAN to LAN.
甚至WAN提供的頻寬也比LAN多，因為頻寬被許多使用者使用，LAN提供了更快的連線，尤其是LAN到LAN的連線。
WAN and LAN may use same devices and technologies but WAN generally uses more specific network devices for long range data transmission.
WAN和LAN可能使用相同的裝置和技術，但WAN通常使用更特定的網路裝置進行遠端資料傳輸。
WAN is main road to connect multiple LAN and MAN networks together but LAN only used to connect different hosts in small range.
WAN是將多個LAN和MAN網路連線在一起的主要途徑，但LAN僅用於連線較小範圍內的不同主機。
廣域網介面是不是wan