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  第72题      
  章/节:   专业英语       

 
We have already covered the topic of network addresses. The first (71) in a block (in classes A, B, and C) defines the network address. In classes A, B, and C, if the hostid is all Is, the address is called a direct broadcast address. It is used by a (72) 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 (73) 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) define a (74) 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 of address to confine the broadcasting to the (75) network. Note that this address belongs to class E.
 
 
  A.  router
 
  B.  switch
 
  C.  hub
 
  D.  firewa
 
 
 

 
  第72题    2013年上半年  
   61%
Traditional network layer packet forwarding relies on the information provided by network layer(71)protocols, or static ..
  第71题    2019年上半年  
   80%
Simple Network Management Protocol(SNMP)is an Internet Standard protocol for collecting and organizing information abo..
  第71题    2014年上半年  
   75%
Together with the network layer,the transport layer is the heart of the protocol ( 71).The network layer provides end-t..
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