ネットワークドメイン分割
2870 ワード
:
Class A : 0.xx.xx.xx ~ 127.xx.xx.xx
Class B : 128.xx.xx.xx ~ 191.xx.xx.xx
Class C : 192.xx.xx.xx ~ 223.xx.xx.xx
Class D : 224.xx.xx.xx ~ 239.xx.xx.xx
Class D (multicast) ( )
Class E : 240.xx.xx.xx ~ 255.xx.xx.xx
Class E
IP
Class A:10.0.0.0 - 10.255.255.255
Class B:172.16.0.0 - 172.31.255.255
Class C:192.168.0.0 - 192.168.255.255
2 :2 0 9 :1,2,4,8,16,32,64,128,256 512. : , . , .
Subnet Masks
IP , , 1 0 , 32 , 1 . , 1 : (default subnet mask).A IP 255.0.0.0;B 255.255.0.0;C 255.255.255.0
Classless Inter-Domain Routing(CIDR)
CIDR ,ISP ,ISP 1 (block size), :192.168.10.32/28, ,/28 1, /32. 1 : A B , 30/, 2
CIDR :
1. 255.0.0.0:/8(A )
2. 255.128.0.0:/9
3. 255.192.0.0:/10
4. 255.224.0.0:/11
5. 255.240.0.0:/12
6. 255.248.0.0:/13
7. 255.252.0.0:/14
8. 255.254.0.0:/15
9. 255.255.0.0:/16(B )
10. 255.255.128.0:/17
11. 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 )
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
1.
2 x -2(x , 2 1 , , -2, , , CISCO ip subnet zero 。)
2.
2 y -2(y , 2 0 )
3.
=256-10 ( block size base number)
4.
= -1
5.
0 1 . 1 = -2( -1)
C : 192.168.10.0; 255.255.255.192(/26)
1. =2*2=4(ip subnet zero )
2. =2 6 -2=62
3. :block size=256-192=64; 192.168.10.0, 192.168.10.64, 192.168.10.128, 192.168.10.192。
4. : -1. 192.168.10.63 192.168.10.127
5. : 192.168.10.1 192.168.10.62; 192.168.10.65 192.168.10.126
B 1: :172.16.0.0; 255.255.192.0(/18)
1. =2*2=4(ip subnet zero )
2. =2 14 -2=16382
3. :block size=256-192=64; 172.16.0.0, 172.16.64.0, 172.16.128.0, 1 172.16.192.0
4. : -1. 2 172.16.63.255 172.16.127.255。
5. : 172.16.0.1 172.16.63.254; 172.16.64.1 172.16.127.254
B 2: :172.16.0.0; 255.255.255.224(/27)
1. =2 11 =2048( B 255.255.0.0, 8+3=11)(ip subnet zero )
2. =2 5 -2=30
3. :block size=256-224=32; 172.16.0.0, 1 172.16.255.224
4. : -1. 1 172.16.0.31 172.16.255.255
5. : 172.16.0.1 172.16.0.30; 1 172.16.255.225 172.16.255.254 Variable Length Subnet Masks(VLSM)