2. 计算机
  3. We have already covered the topic of network addresses．The first (1) in a block(in class A，B，and C) defines the network addres

We have already covered the topic of network addresses．The first (1) in a block(in class A，B，and C) defines the network addres

admin2019-05-15  35
问题 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 1s，the address is called a direct broadcast address．It is used by a  (2)  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  (3)  address in an IP packet．Note also that this special address also reduces the number if available hosted for eachnetid in classes A，B，and C．
    In classes A，B，and C，an address with all 1s 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 destination address in an IP packet．However，a router will block a packet having this type of address to confine the broadcasting to the  (5)  network．Note that this address belongs to class E．
(2)
选项 A、router
B、switch
C、hub
D、firewall
答案A
解析
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