题目内容
A management domain typically contains a large amount of management information. Each individual item of（1）information is an instance of a managed object type. The definition of arelated set of managed （2）types is contained in a Management Information Base(MIB) module. Many such MIB modules are defined. For each managed object type it describes, a MIB（3）defines not only the semantics and syntax of that managed object type, but also the method ofidentifying an individual instance so that multiple（4） of the same managed object type can bedistinguished. Typically, there are instances of each managed object（5） within a managementdomain. （1）是（）
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请用不超过400字的篇幅，提出解决给定材料所反映问题的方案。 要求：条理清晰，体现针对性和可操作性。
We have already covered the topic of network addresses. The first （1） in a block (in class A, B, and C) defines the network address. In classes A, B, and C, if the hosted is all 1 s, the addressis called a direct broadcast address. It is used by a （2）to send a packet to all hosts in a specificnetwork. All hosts will accept a packet having this type of destination address. Note that thisaddress can be used only as a （3） address in an IP packet. Note also that this special addressalso reduces the number if available hosted for each netid in classes A, B, and C.In classes A, B, and C, an address with all 1 s for the netid and hosted (32 bits) define a （4） address in the current network. A host that wants to send a message to every other hosts can use this address as destinationaddress in an IP packet. However, a router will block a packet having this type of address to confine thebroadcasting to the （5） network. Note that this address belongs to class E. （3）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. （2）是（）
Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What’s the main idea of the passage
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