正确答案:
题目：An internet is a combination of networks connected by (1). When a datagram goes from a source to a (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet? The decision is based on optimization: Which of the available (5) is the optimum pathway?
解析：互联网是由不同的网络通过路由器互联起来的。当数据包从源地发往目的地时，在到达目的地网络之前它可能经过多个路由器。路由器从一个网络接收到数据包之后就转发到另外一个网络。然而，一个路由器往往与几个网络连接，当路由器接收到一个数据时，它应该将数据包传向哪个网络呢？这将基于路径最优化决策。
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- An internet is a combination of networks connected by (1). W
- An internet is a combination of networks connected by (1). W
- An internet is a combination of networks connected by (1). W
- An internet is a combination of networks connected by (1). W
- An internet is a combination of networks connected by (1). W
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- For (1) service, we need a virtual-circuit subnet. Let us s
- For (1) service, we need a virtual-circuit subnet. Let us s
- For (1) service, we need a virtual-circuit subnet. Let us s
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