题目内容
Traditional network layer packet forwarding relies on the information provided by network layer （1） protocols, or static routing, to make an independent（2） decisions at each hop within thenetwork. The forwarding （3）is based solely on the destination （4） IP address. All packets for thesame destination follow the same path across the network if no other equal-cost paths exist.Whenever a router has two equal-cost （5）toward a destination, the packets toward the destinationmight take one or both of them, resulting in some degree of load sharing. （4）是（）
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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 routerattached to the destination network. A router receives a （4）from a network and passes it toanother network. A router is usually attached to several networks. When it receives a packet, towhich network should it pass the packet The decision is based on optimization: Which of theavailable（5） is the optimum pathway （4）是（）
Traditional network layer packet forwarding relies on the information provided by network layer （1） protocols, or static routing, to make an independent（2） decisions at each hop within thenetwork. The forwarding （3）is based solely on the destination （4） IP address. All packets for thesame destination follow the same path across the network if no other equal-cost paths exist.Whenever a router has two equal-cost （5）toward a destination, the packets toward the destinationmight take one or both of them, resulting in some degree of load sharing. （5）是（）
Both bus and tree topologies are characterized by the use of multipoint （1）. For the bus, all stations attach, through appropriate hardware （2）known as a tap, directly to alinear transmission medium, or bus. Full-duplex operation between the station and the tap allowsdata to be transmitted onto the bus and received from the （3）. A transmission from anystation propagates the length of the medium in both directions and can be received by all other（4）. At each end of the bus is a （5）, which absorbs any signal, removing it from thebus. （4）是（）
One of the main responsibilities of ICMP is to report （1）. Although technology has produced increasingly reliable transmission media, errors still exist and must be handled. IP is an （2）protocol. This means that error checking and error control are not a concem ofIP JCMP wasdesigned, in part, to compensate for this shortcoming. Howerver, ICMP does not （3）errors, itsimply reports them. Error correction is left to the higher-level protocols. Error messages arealways sent to the original（4） because the only information available in the datagram aboutthe route is the source and destination 1P addresses. ICMP uses the source IP address to send theerror massage to the source of the （5） （3）是（）
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