internetandnetworkingterms(編輯修改稿)
2024-11-29 17:40 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 dress A 32bit address assigned to a puter that uses the TCP/IP protocols. The sender must know the IP address of the destination puter before sending a packet. This is like a phone number for the puter. A program on one puter municates with a program on another puter, by connecting to its IP address. The 32bit address is usually represented as four 8bit decimal numbers separated by periods. Example: ’s IP address is Intro to Computer Networks IPv4 (Inter Protocol Version 4) The version of IP currently used in the Inter. IPv4 uses 32bit addresses Intro to Computer Networks Dotted Decimal Notation The syntactic notation used to express a 32bit IPv4 address. Each octet is written in decimal with a period separating octets. Example: ’s IP address is ’s IP address is ’s IP addresses are , , , , , , , , Intro to Computer Networks IP Numbers Four groups of 8 bit numbers. Each 8 bit range has 256 possibilities: 00000000 = 0 11111111 = 255 Therefore IP’s range from to There are about 4 billion possible addresses. However, there are several reserved ranges. Intro to Computer Networks DNS (Domain Name System) The automated system used to translate puter names into equivalent IP addresses. A DNS server responds to a query by looking up the name and returning the address. DNS is a global distributed database. Central authority for top level domain names. Local authority for your own names. If you tell your web browser to connect to , the web browser will use the DNS system to convert the host name () into an IP address () Intro to Computer Networks Packet A small, selfcontained parcel of data sent across a puter work. Each packet contains a header that identifies the sender and recipient, and a payload area that contains the data being sent. All messages sent on a work such as t
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