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Chapter 3: IP Subnetting and Variable Length Subnet Masks(VLSM)

How to Creat Subnets 如何划分子网?首先要熟记 2 的幂:2 的 0 次方到 9 次方的值分别为:1,2,4,8,16,32,64,128,256 和 512.还有要明白的是:子网划分是借助于取走主机位,把这个取走的部分作为子网位.因此 这个意味划分越多的子网,主机将越少 | Chapter3 IP Subnetting and Variable Length Subnet Masks VLSM Subnetting Basics AI V subnetting Wftft 1.MAI ftS 2 ftlWftf 3.mws afr a How to Creat Subnets WWI tMÜ 2 W 2 W 0 9 ftftWWJJft 1 2 4 8 16 32 64 128 256 ft 512.mæiW T MWfmHft miR WM wms Mw Subnet Masks ftI ÆftWJ IP fWWWAIMft Wftft ftM 1 ft 0 ft 32 ft ftft 1 Wftft I ft.ftftWWHO ftI H 3IA 1 WWItëft default subnet mask .A IP MftWMAAI ftft 255.0.0.0 B Wft 255.255.0.0 C Wft 255.255.255.0 Classless Inter-Domain Routing CIDR CIDR Wft lWÉ ISP OMWWffiÄJSP fêftft ft 1 ftft block size ftftW 192.168.10.32 28 ftft ftftftftftWftI ftft ft 28 ftft ftftft 1 ft 32ÆftftftftftftW 1 âM W A ftft B ftftSft Mft ftftÆWft ft 30 A-- 2 ftftftftft CIDR ft 1. ftft 255.0.0.0 8 A ftftMA ft 2. ftft 255.128.0.0 9 3. ftft 255.192.0.0 10 4. ftft 255.224.0.0 11 5. ftft 255.240.0.0 12 6. ftft 255.248.0.0 13 7. ftft 255.252.0.0 14 8. ftft 255.254.0.0 15 9. ftft 255.255.0.0 16 B ftftMA ft 10. ftft 255.255.128.0 17 11. ftft 255.255.192.0 18 12. 255.255.224.0 19 13. 255.255.240.0 20 14. 255.255.248.0 21 15. 255.255.252.0 22 16. 255.255.254.0 23 17. 255.255.255.0 24 C t O 18. 255.255.255.128 25 19. 255.255.255.192 26 20. 255.255.255.224 27 21. 255.255.255.240 28 22. 255.255.255.248 29 23. 255.255.255.252 30 Subnetting Class A B C Address W l ft Ai fe 1 Wft l WA A l 2 ft x -2 x W BP 2 A 1 ft A 2. W M 2 ft y -2 y ftft W 2 MA 0 ftW 3. A A A A 256-10 Mft block size base number 4. iftrmtftM rmtft T i -1 5. l ftW WJA l ft A 0 A 1 ftftWmmm w 1 A m TA i -2 BPrmtft-1 W O AlftM AM C W l IlW 192.168.10.0 255.255.255.192 26 1. l 2 2-2 2 2. 2 ft 6 -2 62 3. A block size 256-192 64 A 192.168.10.64 A - A 192.168.10.128 4. rWW TA l -1 IA 2 AI ftr tW lJM 192.168.10.127 192.168.10.191 5. MHM M-fTlft tM 192.168.10.65 lj 192.168.10.126 A- A 192.168.10.129 IJ 192.168.10.190 B M 1 HW 172.16.0.0 l fiB 255.255.192.0 18 1. l 2 2-2 2 2. 2 ft 14 -2 16382 3. A block size 256-192 64 WA TI A 172.16.64.0 1 A 172.16.128.0 4. r Mtt T TI -1.W 2 AAllftAWWA lJA 172.16.127.255 .