Chapter05 - Chapter05.fm Page 1 Thursday, December 30, 2004...

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1 CHAPTER 5 Classless Addressing Exercises 1. With the information given, the first address is found by ANDing the host address with the mask 255.255.0.0 (/16). The last address can be found by ORing the host address with the mask comple- ment 0.0.255.255. However, we need to mention that this is the largest possible block with 2 16 addresses. We can have many small blocks as long as the number of addresses divides this number. 3. See below. The number of created subnets are equal to or greater than required. Host Address: 25 . 34 . 12 . 56 Mask (ANDed): 255 . 255 . 0 . 0 Network Address (First): 25 . 34 . 0 . 0 Host Address: 25 . 34 . 12 . 56 Mask Complement (ORed): 0 . 0 . 255 . 255 Last Address: 25 . 34 . 255 . 255 a. log 2 2 = 1 Number of 1’s = 1 Number of created subnets: 2 b. log 2 62 = 5.95 Number of 1’s = 6 Number of created subnets: 64 c. log 2 122 = 6.93 Number of 1’s = 7 Number of created subnets: 128 d. log 2 250 = 7.96 Number of 1’s = 8 Number of created subnets: 256
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SECTION 2 5. a.
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Chapter05 - Chapter05.fm Page 1 Thursday, December 30, 2004...

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