The network administrator needs to address seven LANs． RIP version 1 is the only routing protocol in use on the network and subnet 0 is not being used． What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?
  • 1、
【正确答案】 1、C    
【答案解析】需要7个网段，加上不可用的0网段一共8个网段，每个网段有32个IP地址，去掉两个不可用的，答案30。