參數(shù)資料
型號(hào): 20-101-0494
廠商: Rabbit Semiconductor
文件頁數(shù): 42/90頁
文件大?。?/td> 0K
描述: MODULE RABBITCORE RCM2250
標(biāo)準(zhǔn)包裝: 1
系列: RabbitCore®
模塊/板類型: MPU 核心模塊
適用于相關(guān)產(chǎn)品: RCM2250
產(chǎn)品目錄頁面: 620 (CN2011-ZH PDF)
其它名稱: 316-1092
User’s Manual
41
6.3 IP Addresses Explained
IP (Internet Protocol) addresses are expressed as 4 decimal numbers separated by periods,
for example:
216.103.126.155
10.1.1.6
Each decimal number must be between 0 and 255. The total IP address is a 32-bit number
consisting of the 4 bytes expressed as shown above. A local network uses a group of adja-
cent IP addresses. There are always 2N IP addresses in a local network. The netmask (also
called subnet mask) determines how many IP addresses belong to the local network. The
netmask is also a 32-bit address expressed in the same form as the IP address. An example
netmask is:
255.255.255.0
This netmask has 8 zero bits in the least significant portion, and this means that 28
addresses are a part of the local network. Applied to the IP address above
(216.103.126.155), this netmask would indicate that the following IP addresses belong to
the local network:
216.103.126.0
216.103.126.1
216.103.126.2
etc.
216.103.126.254
216.103.126.255
The lowest and highest address are reserved for special purposes. The lowest address
(216.103.126.0) is used to identify the local network. The highest address
(216.103.126.255) is used as a broadcast address. Usually one other address is used for the
address of the gateway out of the network. This leaves 256 - 3 = 253 available IP
addresses for the example given.
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