穿旧的鞋子扔掉有讲究:CCNA模拟卷中的题,大家帮我解释一下,谢谢

来源：百度文库编辑：神马品牌网时间：2024/04/29 08:53:35

Given the choices below, which address represents a unicast address?
A. 224.1.5.2
B. FFFF. FFFF. FFFF.
C. 192.168.24.59/30
D. 255.255.255.255
E. 172.31.128.255/18
Answer: E
Explanation:
172.31.128.255 is the only unicast address. It seems to be a broadcast address, because of
255 in the last octet, the broadcast address for this network is 172.31.131.255.
Incorrect Answers:
A: 224.1.5.2 is a multicast(多点传送) address.
B: This is a broadcast layer 2 (data link) address.
C: Using a /30 for the subnet mask, this IP address becomes the broadcast address.
D. This is a broadcast IP address.
其中题目中的unicast是什么意思?谢谢
还有关于错误的B 的解释,192.168.24.59/30应该不是广播地址啊,192.168.24.63才是啊,谢谢
谢谢doyouwannasee,现在不明白的是E 中172.31.191.25才是广播地址啊,172.31.131.255似乎不是啊?谢谢

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