Metadata
Author: WikiMatrix
Data
English[en]
From a physical standpoint, overlay networks are quite complex (see Figure 1) as they combine various logical layers that are operated and built by various entities (businesses, universities, government etc.) but they allow separation of concerns that over time permitted the buildup of a broad set of services that could not have been proposed by a single telecommunication operator (ranging from broadband Internet access, voice over IP or IPTV, competitive telecom operators etc.).
Chinese[zh]
从物理的角度看,覆盖网络相当复杂(参见图1),因为其中组合了多种多样、由不同实体(商业公司、大学、政府等)负责操作和建立的逻辑层,同时这类网络鼓励关注点分离,从而随着时间的推移,可以逐渐累积范围更广的服务(从宽带互联网接入,IP语音或 IPTV以及有竞争力的电信维等),而这些服务不太可能由某个单一的电信运营商来提供。