Question: In Figure 19.4, a. Show how wrapped sum can be calculated from the sum using modular arithmetic. b. Show how checksum can be calculated from

In Figure 19.4,

Figure 19.4 Example of checksum calculation in IPV4 4 28 49.153 4 17 10.12.14.5 12.6.7.9 4, 5, and 0 0 0 I C 4 28 1 C O and 0 4 and 17 4 1 Replaces 0 O A 0 C E O 0 C 7 10.12 14.5 12.6 6

a. Show how wrapped sum can be calculated from the sum using modular arithmetic.

b. Show how checksum can be calculated from the wrapped sum using modular arithmetic.

Figure 19.4 Example of checksum calculation in IPV4 4 28 49.153 4 17 10.12.14.5 12.6.7.9 4, 5, and 0 0 0 I C 4 28 1 C O and 0 4 and 17 4 1 Replaces 0 O A 0 C E O 0 C 7 10.12 14.5 12.6 6 7.9 0 9 Sum 13 4 4 E Wrapped sum 3 4 4 F Checksum CB B 0

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