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Chapter20 - CHAPTER 20 SMTP Exercises 1 MIME-version 1.1...

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1 CHAPTER 20 SMTP Exercises 1. MIME-version : 1.1 Content-Type : Text/Plain Content-Transfer-Encoding : 7bit 3. 1000 × 8 /24 = 333.3 ====> 334 blocks of 24 bits. Each block becomes 32 bits. There are 334 × 32 / 8 = 1336 bytes in the encoded message. There are 336 redundant bytes. The ratio of redundant bytes to the entire message length is 336 /1336 = 0.25. 5. The efficiency in Exercise 3 is 1,000/1,336 = 75%. The efficiency in Exercise 4 is 1,000/1,200 = 83%. The efficiency is improved 8%. 7. a. Original: b. Encoded: 01010111 00001111 11110000 10101111 01110001 01010100 01010111 00001111 =F0 =AF 01110001 01010100
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SECTION 2 c. Bit Pattern: 9. a. Original: b. Encoded: c. Bit Pattern: 11. The MAIL FROM: in the envelope contains the source e-mail address while the FROM in the header contains the name of the sender. 13. See Figure 20.1. 15. See Figure 20.2. 01010111 00001111 00111101 01000110 00110000 00111101 01000001 01000110 01110001 01010100 01010111 00001111 11110000 10101111 01110001 01010111 00001111 =F0 =AF 01110001 01010111 00001111 00111101 01000110 00110000 00111101 01000001 01000110 01110001 Figure 20.1 Exercise 13 Client Server 220 (Service ready) HELO xxx.com 250 (Request completed)
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