TAILIEUCHUNG - The Illustrated Network- P59

The Illustrated Network- P59:In this chapter, you will learn about the protocol stack used on the global public Internet and how these protocols have been evolving in today’s world. We’ll review some key basic defi nitions and see the network used to illustrate all of the examples in this book, as well as the packet content, the role that hosts and routers play on the network, and how graphic user and command line interfaces (GUI and CLI, respectively) both are used to interact with devices. | CHAPTER 21 SMTP and Email 549 Table MIME Content Types and Subtypes Type Subtypes text plain richtext tab-separated-values html sgml image jpeg gif ief tiff g3fax png video mpeg quicktime audio basic 32kadpcm application octet-stream postscript rtf pdf zip macwriteii msword remote-printing EDI-X12 EDIFACT dec-dx dca-rft activemessage applefile mac-binhex40 news-message-id mews-transmission mathematica pgp-encrypted pgp-signature pgp-keys andrew-inset slate set-payment set-registration sgml wita lotus-wordpro lotus-1-2-3 lotus-organizer ms-excel powerbuilder-6 multipart mixed alternative digest parallel appledouble header-set form-data report voice-message signed encrypted message rfc822 partial external-body news http delivery-status Table MIME Encoding Methods and Meanings Method Meaning 7bit Ordinary ASCII as used in the United States. quoted-printable Adds a few special characters and coding to ASCII text. base64 Content is mapped into a text package very common . 8bit Similar to 7bit but can include 8-bit characters. binary True binary data. x- name Experimental encodings must have a name starting with x . and even as executable code much to the chagrin of network administrators . Base64 encoding converts a binary data stream to a sequence of text characters. This usually results in the size of the binary file growing by about 33 in terms of bytes. This is because 6 bits can indicate the numbers 0 through 63. But bytes are 8 bits of course at least where the Internet and TCP IP are concerned. An Example of a MIME Message Consider a writer delivering a short story to an editor as an email attachment been there done that . What would the MIME headers that form the overall body of the email message look like Well they would resemble the following Content-Type multipart mixed boundary --- This is a message in MIME format. --- _NextPart Content-Type text plain 550 PART IV

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