IP Addressing - Subnetting
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1 IP Addressing - Subnetting
2 The Two Parts of an IP Address 32 Bits Prefix Host Prefix Length
3 IP Address Classes Classes are now considered obsolete But you have to learn them because Everyone in the industry still talks about them! You may run into a device whose configuration is affected by the classful system
4 Classful IP Addressing Class First First Byte Prefix Intent Few Bits Length A * 8 Very large networks B Large networks C Small networks D NA IP multicast E NA Experimental *Addresses starting with 127 are reserved for IP traffic local to a host.
5 Division of the Classful Address Space Class Prefix Number of Addresses Length per Network A = 16,777,214 B = 65,534 C = 254
6 Classful IP is Wasteful Class A uses 50% of address space Class B uses 25% of address space Class C uses 12.5% of address space Class D and E use 12.5% of address space
7 Prefix Length An IP address is accompanied by an indication of the prefix length Subnet mask /Length Examples /24
8 Subnet Mask 32 bits long Specifies which part of an IP address is the network/subnet field and which part is the host field The network/subnet portion of the mask is all 1s in binary. The host portion of the mask is all 0s in binary. Convert the binary expression back to dotted-decimal notation for entering into configurations. Alternative Use slash notation (for example /24) Specifies the number of 1s
9 Subnet Mask Example What is this in slash notation? What is this in dotted-decimal notation?
10 Another Subnet Mask Example What is this in slash notation? What is this in dotted-decimal notation?
11 One More Subnet Mask Example What is this in slash notation? What is this in dotted-decimal notation?
12 Designing Networks with Subnets Determining subnet size Computing subnet mask Computing IP addresses
13 Addresses to Avoid When Subnetting A node address of all ones (broadcast) A node address of all zeros (network) The next ones are allowed by the subnet standard A subnet address of all ones (all subnets) A subnet address of all zeros (confusing)
14 Practice Network is You want to divide the network into subnets. You will allow 600 nodes per subnet. What subnet mask should you use? What is the address of the first node on the first subnet? What address would this node use to send to all devices on its subnet?
15 More Practice Network is You have eight LANs, each of which will be its own subnet. What subnet mask should you use? What is the address of the first node on the first subnet? What address would this node use to send to all devices on its subnet?
16 One More Network is You want to divide the network into subnets. You will have approximately 25 nodes per subnet. What subnet mask should you use? What is the address of the last node on the last subnet? What address would this node use to send to all devices on its subnet?
17 Addressing example
18 Addressing example Step One. Count hosts on each subnet, and refer back to the chart showing how many addresses can be assigned for each prefix length. Two of the branch offices have 20 hosts (21 including the router), and the other has 25 hosts (26 including the router). Each of these subnets will require a /27 prefix, since these can handle up to 30 addresses. Of the headquarters subnets, the one with 30 hosts will require another /27, the one with 50 hosts will require a /26, and the two 10 host subnets each require a /28. The three WAN links, each requiring a /30, and the Ethernet connecting the two routers together, which also requires a /30. However, since more hosts might later be added to the Ethernet, we'll assign it a /29 for expansion purposes. Step Two. Assign largest subnets first. The largest subnet is the headquarters subnet with 50 hosts, requiring a /26 prefix. We'll assign to it /26, using numbers from 0 to 63 in the fourth byte. Next we need four /27s (one in the headquarters, and one for each of the branch offices). We'll assign /27, /27, /27, and /27. We've now used numbers from 0 to 191 in the fourth byte. The two /28s will be /28 and /28. That leaves /29 for the Ethernet between the two headquarters routers, and the remaining address space for the three WAN links: /30, /30 and /30.
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