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  3. We have already covered the topic of net

We have already covered the topic of net

最全题库2022-08-02  23
问题 We have already covered the topic of network addresses. The first （  ） in a block (in classes A，B，and C) defines the network address. In classes A，B，and C，if the hostid is all ls， the address is called a direct broadcast address. It is used by a.（  ） to send a packet to all hosts in a specific network. All hosts will accept a packet having this type of destination address. Note that this address can be used only as a （  ） address in an IP packet. Note also that this special address also reduces the number of available hostid for each netid in classes A，B，and C.In classes A，B，and C，an address with all is for the netid and hostid (32 bits) defines a（  ） address in the current network.A host that wants to send a message to every other host can use this address as a destination address in an IP packet. However，a router will block a packet having this type ofaddress to confine the broadcasting to the （  ） network. Note that this address belongs to class E.A.datagramB.functionC.addressD.service
选项 A.datagram
B.function
C.address
D.service
答案 C
解析 我们已经讨论过这个网络地址的话题了。第一个地址在一个地址区域内(在类a、B和C)定义了网络地址。在A、B和C类地址中，如果主机ID都是1，地址叫做直接广播地址。它被用与从一台路由器发送数据包至所有的主机，而这些主机都在一个特定的网络中。所有的主机都将接受一个拥有这类的目标地址的数据包。注意，这个地址可以仅作为一个目的地地址lP包。还请注意，这个特殊的地址也降低了在A、B、C类地址中每个网路ID下的主机ID数量
在A、B和C类地址中，一个地址均是 作为 netid和hostid((32位) 被定义在当前的网络一个广播地址。一个主机，希望将消息发送到所有其他主机可以在IP数据包使用这个地址作为目的地地址。然而，路由器将阻止一个拥有这种类型的地址的数据包来限制广播到本地的网络。注意，这个地址属于E类。
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初级网络管理员

软件水平考试初中高级

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