I Figure 10-1: Network Simulation 6. Run the simulation for some simulated period of time Examine the output to determine implications Validate the simulation if possible(compare with actual data to see if it is correct)
11 Figure 10-1: Network Simulation • 6. Run the simulation for some simulated period of time – Examine the output to determine implications – Validate the simulation if possible (compare with actual data to see if it is correct)
Figure 10-5: What-If Analysis [办 uery Response Time (sec) FtpDownload Response Time (sec) PCa wth OA 64l H PCa wth OR 64l Ps wth OR 128k ■PCwD16k DB Quey Response Tme lsec Ftp CoNrad Respcnse Tine Isec Response Time for Response Time for Database Applicato Little Effect Major Effect 150 64 kbps ,, 64 kbps 12娜平 .128kbps.a.t-. 40m Do what-if analyses, trying different alternatives 12
12 Figure 10-5: What-If Analysis 7. Do what-if analyses, trying different alternatives
1 IP Subnetting
IP Subnetting
)IP Subnetting IP Addresses always are 32 bits long The firm is assigned a network part Usually with 8 to 24 bits The firm can assign the remaining bits to the subnet part and the host part Different choices give different numbers of subnets and hosts per subnet, as in the following examples Firms must trade-off the number of subnets and the number of hosts per subnet in a way that makes sense for their organizational situation 14
14 IP Subnetting • IP Addresses always are 32 bits long • The firm is assigned a network part – Usually with 8 to 24 bits • The firm can assign the remaining bits to the subnet part and the host part – Different choices give different numbers of subnets and hosts per subnet, as in the following examples – Firms must trade-off the number of subnets and the number of hosts per subnet in a way that makes sense for their organizational situation
)IP Subnetting If a part has n bits, it can represent 2 -2 subnets or hosts per subnet 2N because if you have N bits, you can represent 2N possibilities Part Size 2 2N2 Minus 2 is because (bits you cannot have a 4 24=16 16-2=14 part that is all 8 ? zeros or all ones 10 ? 12 4.096 4.094 16 65536 65534 15
15 IP Subnetting • If a part has N bits, it can represent 2N-2 subnets or hosts per subnet – 2 N because if you have N bits, you can represent 2N possibilities – Minus 2 is because you cannot have a part that is all zeros or all ones Part Size (bits) 2 N 2 N-2 4 2 4 = 16 16-2 = 14 8 ? ? 12 4,096 4,094 16 65,536 65,534 10 ? ?