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Chapter17 - CHAPTER 17 Domain Name System(DNS Exercises 1 a...

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1 CHAPTER 17 Domain Name System (DNS) Exercises 1. a. PQDN b. FQDN c. PQDN d. FQDN 3. 0000000100000000 = 0x0100 5. 1000111110000000 = 0x8F80 This is a response message from an authoritative server. The request was an inverse request with recursion desired and recursion was available. The message is truncated. 7. The size of a question record is not fixed because query name field is variable in length. 9. Query name = 3 a t c 4 f h d a 3 e d u 0 = 14 bytes Query type = 2 bytes Query class = 2 bytes Question Record = 14 + 2 + 2 = 18 bytes 11. Assuming that the domain name field is a pointer, the record is 22 bytes in length.
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SECTION 2 13. Query name = 10 c h a l l e n g e r 3 a t c 4 f h d a 3 e d u 0 = 25 bytes Header = 12 bytes Query type = 2 bytes Query class = 2 bytes Query Message = 25 + 12 + 2 +2 = 41 bytes 15. The size of the response message depends on the number of digits in the requested IP address. 17. See Figure 17.1. 19. See Figure 17.2. Figure 17.1 Exercise 17 Figure 17.2 Exercise 19 0x8580 11 0 1 4 "c" "h" "a" "l" 4 "f" "h" "d" "a" 3 "e" "d" "u" 0 0 44 "f" "h" "d" "a" 3 "e" "d" "u" 0 0x1333 0xC0 1 0 0 0x0C 12000
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Chapter17 - CHAPTER 17 Domain Name System(DNS Exercises 1 a...

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