Chapter 4. IP Addresses: Classful Addressing
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1 Chapter 4 IP Addresses: Classful Addressing The McGraw-Hill Companies, Inc.,
2 CONTENTS INTRODUCTION CLASSFUL ADDRESSING OTHER ISSUES A SAMPLE INTERNET The McGraw-Hill Companies, Inc.,
3 4.1 Introduction An IP address is a 32-bit address that identifies a connection to the Internet. The IP addresses are universally unique. The address space of IPv4 is 2 32 or 4,294,967,296. IP address is written as a Binary (hexadecimal) or a Dotted- Decimal (w/out leading zeros) notation. See examples in the textbook. The McGraw-Hill Companies, Inc.,
4 4.2 CLASSFUL ADDRESSING The IP address space (all possible IP values) is divided into five classes: A, B, C, D, and E The McGraw-Hill Companies, Inc.,
5 Finding the class of an IP address 1 st Byte decimal values The McGraw-Hill Companies, Inc.,
6 Example 5 How can we prove that we have 2,147,483,648 addresses in class A? Solution In class A, only 1 bit defines the class. The remaining 31 bits are available for the address. With 31 bits, we can have 2 31 or 2,147,483,648 addresses. The McGraw-Hill Companies, Inc.,
7 Example 6 (Continued) Find the class of the address: Solution The first 2 bits are 1; the third bit is 0. This is a class C address. The McGraw-Hill Companies, Inc.,
8 Example 7 Find the class of the address: Solution The first byte is 227 (between 224 and 239); the class is D. The McGraw-Hill Companies, Inc.,
9 Example 7 (Continued) Find the class of the address: Solution The first byte is 193 (between 192 and 223); the class is C. The McGraw-Hill Companies, Inc.,
10 Netid and hostid Only classes A, B, and C addresses are subdivided. Exercise: How many different Netid s and Host s in each of the classes A, B, C? Netid s 2^(8-1) = 128 2^(16-2) = 16,384 2^(24-3) = 2,097,152 Hostid s 2^24 = 16,777,216 2^16 = 65,536 2^8 = 256 The McGraw-Hill Companies, Inc.,
11 Blocks in class A Millions of class A addresses are wasted. One Block (Netid( 10) is for Private Addresses. The McGraw-Hill Companies, Inc.,
12 Blocks in class B Many class B addresses are wasted. 16 Blocks are reserved for Private Addresses. The McGraw-Hill Companies, Inc.,
13 Blocks in class C The number of addresses in a class C block is smaller than the needs of most organizations. 256 Blocks are reserved for Private Addresses. The McGraw-Hill Companies, Inc.,
14 Class D addresses (ONE block) are used for multicasting; Each address define one group. Each group member has a multicast and a unicast IP address Class E addresses (ONE block) are reserved for special purposes (limited broadcast) ; most of the block is wasted. The McGraw-Hill Companies, Inc.,
15 Network Addresses 1. The network address is the first address in the block. 2. The network address defines the network to the rest of the Internet. 3. Given the network address, we can find the class of the address, the block, and the range of the addresses in the block The McGraw-Hill Companies, Inc.,
16 Example 9 Given the network address , find the class, the block, and the range of the addresses. Solution The class is A because the first byte is between 0 and 127. The block has a netid of 17. The addresses range from to The McGraw-Hill Companies, Inc.,
17 Example 10 Given the network address , find the class, the block, and the range of the addresses. Solution The class is B because the first byte is between 128 and 191. The block has a netid of The addresses range from to The McGraw-Hill Companies, Inc.,
18 Example 11 Given the network address , find the class, the block, and the range of the addresses. Solution The class is C because the first byte is between 192 and 223. The block has a netid of The addresses range from to The McGraw-Hill Companies, Inc.,
19 IP address Network Address 1. Find the class, then the Netid, then set Hostid = 0 Example: IP= is a class B ( ) with Netid=134.45, so its network address is Use a Mask which is a 32-bit binary number that gives the first address in the block (the network address) when bitwise ANDed with an address in the block. The McGraw-Hill Companies, Inc.,
20 Default Masks Class A Mask in dotted-decimal B C The McGraw-Hill Companies, Inc.,
21 The network address is the beginning address of each block. It can be found by applying the default mask to any of the addresses in the block (including itself). It retains the netid of the block and sets the hostid to zero. The McGraw-Hill Companies, Inc.,
22 Example 12 Given the address and the default class A mask, find the beginning address (network address). Solution The default mask is , which means that only the first byte is preserved and the other 3 bytes are set to 0s. The network address is The McGraw-Hill Companies, Inc.,
23 Example 13 Given the address and the default class B mask, find the beginning address (network address). Solution The default mask is , which means that the first 2 bytes are preserved and the other 2 bytes are set to 0s. The network address is The McGraw-Hill Companies, Inc.,
24 We must not apply the default mask of one class to an address belonging to another class. The McGraw-Hill Companies, Inc.,
25 IP addresses are almost depleted even though the number of devices on the Internet is much less than 2^32. Remedies to this problem are discussed in Chapter 5 The McGraw-Hill Companies, Inc.,
26 4.13 OTHER ISSUES The McGraw-Hill Companies, Inc.,
27 Multihomed devices The McGraw-Hill Companies, Inc.,
28 Special Addresses 1. Network Address 2. Direct Broadcast Address 3. Limited Broadcast Address 4. This Host on This Network 5. Specific Host on This Network 6. Loopback Address The McGraw-Hill Companies, Inc.,
29 Network addresses The McGraw-Hill Companies, Inc.,
30 Example of direct broadcast address The McGraw-Hill Companies, Inc.,
31 Example of limited broadcast address The McGraw-Hill Companies, Inc.,
32 Example of this host on this address The McGraw-Hill Companies, Inc.,
33 Example of specific host on this network The McGraw-Hill Companies, Inc.,
34 Example of loopback address The McGraw-Hill Companies, Inc.,
35 Private Addresses A number of blocks in each class are assigned for private use. They are not recognized globally. The McGraw-Hill Companies, Inc.,
36 Unicast,, Multicast, and Broadcast Addresses Unicast communication is one-to-one. Multicast communication is one-to-many. (Class D address defining the Groupid) Broadcast communication is one-to-all. The McGraw-Hill Companies, Inc.,
37 4.4 A SAMPLE INTERNET WITH CLASSFUL ADDRESSES The McGraw-Hill Companies, Inc.,
38 Sample internet The McGraw-Hill Companies, Inc.,
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