從網路的組成元件來談網際網路. 資管系 梁德昭. 今日的 Internet 是如何形成的？. 通訊技術 區域網路( Local Area Network, LAN) 都會網路( Metropolitan Area Network, MAN) 廣域網路( Wide Area Network, WAN) 通訊協定 TCP/IP. Internet 的構成. 簡單的 Internet 模型. 區域網路( LAN).
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A local area network (LAN) is a data communication system that allows a number of independent devices to communicate directly with each other in a limited geographic area such as a single department, a single building, or a campus. A large organization may need several connected LANs.The most popular LANs are Ethernet and wireless LANs. We briefly review these technologies in this section.
Wired LANs: Ethernet
Wireless LANs: IEEE 802.11
A repeater connects segments of a LAN. It forwards every bit but has no filtering capability.
A bridge has a table used in filtering decisions. It does not change the physical (MAC) addresses in a frame.
A router is a three-layer (physical, data link, and network) device. It connects independent LANs or WANs to create an internetwork (internet)