Download Network World - 24 January 2011 by John Dix (Editor) PDF

By John Dix (Editor)

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An HTML coded document, which we normally refer to as a Web page, consists of a head and body, similar to a letter. However, instead of using English, French or another language in a letter, we use HTML code to develop the manner by which a Web page will be displayed. The head The head of an HTML document represents an unordered collection of information about the document. In HTML coding information to be displayed in some manner is commonly contained within a pair of tags which in turn are encased in brackets.

38 illustrates gateway connectivity obtained via the use of an IBM 3278/9 adapter. A gateway using an IBM 3278/9 adapter is limited to supporting up to five concurrent network workstation communications sessions to the mainframe. 4 INTERNETWORKING 685 function terminal (DFT) port, which is limited to supporting five concurrent sessions. Thus, seven gateways using 3278/9 adapter cards would be required to provide an equivalent level of concurrent sessions obtained through the use of a SDLC adapter card.

In comparison, through the use of a multicast address one video stream would be routed to the private network. 670 NETWORK ARCHITECTURE Class E The fifth address class defined by the IP address specification is a reserved address class known as Class E. A Class E address is defined by the first 4 bits in the 32-bit IP address having the value of 1111. 4 million addresses. Class E addresses are restricted for experimentation. Dotted-decimal notation Recognizing that the direct use of 32-bit binary addresses is both cumbersome and unwieldy, a technique more acceptable for human use was developed.

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