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Be sure to do Exercise 4-1 found in the LabBookpdf on the CD-ROM
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tabLe 4-1
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IP address Subnet mask Address portion 192 255 N
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15 0 H
Identifying the Network ID and Host ID Portions of an IP Address
tabLe 4-2
octet 1
IP address 1 Subnet mask IP address 2 192 255 192
octet 2
168 255 198
octet 3
1 255 45
octet 4
15 0 10
Identifying Two Systems on Different Networks Using the Subnet Masks
4:
TCP/IP Fundamentals
Default gateway
When your system wants to send data to another system on the network, it looks at its own network ID and compares that to the destination system s IP address If it appears that they both have the same network ID, the data is sent directly from your system to the destination system If the two systems are on different networks, your system must pass the data to the router so that the router can send the data to the destination system s router The question is now, how does your system know who the router is The answer is that is what the default gateway is The default gateway is the IP address of the router that can send data from your network In order to communicate on the Internet, your system will need to be configured with an IP address, a subnet mask, and a default gateway If you need to communicate only with other systems on your network, you will need only an IP address and a subnet mask To view your TCP/IP settings, you can go to a command prompt and type ipconfig you should see output similar to that shown in Figure 4-3 You will learn more about TCP/IP-related commands later in this chapter and in 6
figure 4-3
Viewing your TCP/IP settings
CertifiCation objeCtive 403
tCP/iP addressing
This section will introduce you to the binary representation of an IP address and ensure that before you move onto the next chapter (on subnetting) you feel comfortable with converting binary values to decimal and address classes
TCP/IP Addressing
understanding binary
You know from the previous discussion that the IP address is a 32-bit address divided into four 8-bit blocks (called octets) The four octets are normally displayed as decimal values but also have a binary representation that looks like
11000000 10101000 00000001 00001111
Notice that there are four sets of 8 bits (1 or 0), which makes up the 32 bits (8 4 sets) of an IP address Let s take a look at how you can determine the binary representation of an octet The values of the 8 bits within the octet are shown in Table 4-3 Looking at Table 4-3, you can see that the first bit in an octet (far right) has a decimal value of 1, the second bit has a decimal value of 2, the third bit has a decimal value of 4, and the values keep doubling with each additional bit You can also see that the eighth bit has a decimal value of 128 The first bit is known as the least significant bit or low-order bit, while the eighth bit is known as the most significant bit or high-order bit To calculate the binary value of an octet with a decimal number such as 192, you need to enable, or turn on, the bits that will add up to the number of 192, as shown in Table 4-4 Notice that the foregoing table has bit eight and bit seven turned on to give you a value of 128 + 64, which equals 192 The remaining bits will take an off state, which means they are not included in the calculation A bit that has an on state takes a 1, and an off state takes a 0 So the combination of 8 bits to make the number 192 would be 11000000 Now that you know how to convert a decimal value to binary and a binary value to decimal, try out Exercise 4-2 before moving on to the section on address classes
tabLe 4-3
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