处于下一代网络核心的是一类新的交换机,它们可使未来网络比路由或共享介质网络更高效地设计和运行。这些交换机的发展过程充满了喧嚣,厂商们对这些交换机优点的宣传令人难以置信。但不可否认,每种产品在当今更加智能化的网络中均占有一席之地。第二层的局限为理解第二层、第三层和第四层交换机间的区别,首先应对“交换”应用于联网时的真正含 At the heart of NGNs is a new class of switches that enable future networks to be designed and run more efficiently than routing or sharing media networks. The development of these switches is full of noise, and the hype of vendors on these switches is unbelievable. But it is undeniable that each product has a place in today’s smarter networks. The second layer of the limitations To understand the second layer, third layer and fourth layer switches between the difference, first of all should deal with “exchange” when applied to the real network