FALLSEM2017-18_CSE1004_ETH_SJT801_VL2017181001225_Reference Material I_Chap-04 IP Addresses Classful

FALLSEM2017-18_CSE1004_ETH_SJT801_VL2017181001225_Reference Material I_Chap-04 IP Addresses Classful

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Objectives Upon completion you will be able to: IP Addresses: IP Addresses: Classful Addressing Classful Addressing Understand IPv4 addresses and classes Identify the class of an IP address Find the network address given an IP address Understand masks and how to use them Understand subnets and supernets
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An IP address is a 32-bit address. Note: Note:
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The IP addresses are unique. Note: Note:
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The address space of IPv4 is 2 32 or 4,294,967,296. Note: Note:
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Figure 4.1 Dotted-decimal notation
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Change the following IP addresses from binary notation to dotted-decimal notation. a. 10000001 00001011 00001011 11101111 b . 11000001 10000011 00011011 11111111 c. 11100111 11011011 10001011 01101111 d. 11111001 10011011 11111011 00001111 Example 1 Solution We replace each group of 8 bits with its equivalent decimal number (see Appendix B) and add dots for separation: a. 129.11.11.239 b. 193.131.27.255 c. 231.219.139.111 d. 249.155.251.15
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Change the following IP addresses from dotted-decimal notation to binary notation. a. 111.56.45.78 b. 221.34.7.82 c. 241.8.56.12 d. 75.45.34.78 Example 2 Solution We replace each decimal number with its binary equivalent: a. 01101111 00111000 00101101 01001110 b. 11011101 00100010 00000111 01010010 c. 11110001 00001000 00111000 00001100 d. 01001011 00101101 00100010 01001110
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Find the error, if any, in the following IP addresses: a. 111.56.045.78 b. 221.34.7.8.20 c. 75.45.301.14 d. 11100010.23.14.67 Example 3 Solution a. There are no leading zeroes in dotted-decimal notation (045). b. We may not have more than four numbers in an IP address. c. In dotted-decimal notation, each number is less than or equal to 255; 301 is outside this range. d. A mixture of binary notation and dotted-decimal notation is not allowed.
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Change the following IP addresses from binary notation to hexadecimal notation. a. 10000001 00001011 00001011 11101111 b. 11000001 10000011 00011011 11111111 Example 4 Solution We replace each group of 4 bits with its hexadecimal equivalent (see Appendix B). Note that hexadecimal notation normally has no added spaces or dots; however, 0X (or 0x) is added at the beginning or the subscript 16 at the end to show that the number is in hexadecimal. a. 0X810B0BEF or 810B0BEF 16 b. 0XC1831BFF or C1831BFF 16
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4.2 CLASSFUL ADDRESSING IP addresses, when started a few decades ago, used the concept of IP addresses, when started a few decades ago, used the concept of classes. This architecture is called classes. This architecture is called classful addressing classful addressing . In the mid-1990s, . In the mid-1990s, a new architecture, called classless addressing, was introduced and will a new architecture, called classless addressing, was introduced and will eventually supersede the original architecture. However, part of the eventually supersede the original architecture. However, part of the Internet is still using classful addressing, but the migration is very fast.
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