# Chapter23 - Chapter23.fm Page 1 Friday 11:56 AM CHAPTER 23...

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1 CHAPTER 23 IP Over ATM Exercises 1. The minimum size of an IP datagram is 20 bytes. Therefore, only 1 cell is needed for this datagram. The maximum size of an IP datagram is 65536 bytes. Therefore 65536 + 8 bytes of trailer = 65544 bytes. 65544/48 = 1365 with a remainder. So 1366 cells are needed. 3. a. 40 bytes of data ; (40 + 0 + 8) mod 48 = 0 b. 48 bytes of data ; (48 + 40 + 8) mod 48 = 0 c. 41 bytes of data : (41 + 47 + 8) mod 48 = 0 5. 42 bytes of data + 8 bytes of trailer = 50 bytes. 2 cells are needed: Cell 1 : 42 bytes of data, 6 bytes of pad Cell 2 : 40 bytes of pad, 8 bytes of trailer 7. See Figure 23.1 9. See Figure 23.2.

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SECTION 2 11. The trailer carries length information so that the receiver knows if any data is miss- ing. Figure 23.1 Exercise 7 Figure 23.2 Exercise 9 0x0800 0x04 0x04 0x14 0x0013 0x2222222222222222222222222222222222222222 a. Inverse request 172.14.20.16/16 0x14 Reserved Reserved 0x0008 20 bytes of zeros 180.25.23.14/24 0x0800 0x04 0x04 0x14 0x0013 b. Inverse replied 0x14 Reserved Reserved 0x0009 0x2222222222222222222222222222222222222222 0x3333333333333333333333333333333333333333 180.25.23.14/24 172.14.20.16/16 A B C D E H G F III III III 2.2.2.6

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