Écrit par CCNA
|
26-05-2008 |
- Subnet 172.160.0.0/18
-
Step 1 : IP class
172.160.0.0/18 (classless) --> 172.160.0.0/16 (B- class)
-
Step 2 : host part
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
1 |
1 |
0
|
0 |
0 |
0 |
0 |
0 |
--> 27+26 = 128+64 = 192
-
Step 3 : number of subnets
22-2 = 2 subnets available
-
Step 4 : number of hosts per subnet
214-2 = 16382 hosts per subnet
-
Step 5 : block size
Block size = 256-192= 64
-
Step 6 : subnet mask
Subnet mask = 255.255.192.0
-
Step 7 : subnets and their characteristics
N° |
NetID
|
IP range |
Broadcast
|
1 |
172.160.64.0 |
64.1-->127.254 |
172.160.127.255 |
2 |
172.160.128.0 |
128.1-->191.254 |
172.160.191.255 |
- Subnet 172.160.0.0/20
-
Step 1 : IP class
172.160.0.0/20 (classless) --> 172.160.0.0/16 (B- class)
-
Step 2 : host part
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
1 |
1 |
1
|
1
|
0 |
0 |
0 |
0 |
--> 27+26+25+24 = 128+64+32+16 = 240
-
Step 3 : number of subnets
24-2 = 14 subnets available
-
Step 4 : number of hosts per subnet
212-2 = 4094 hosts per subnet
-
Step 5 : block size
Block size = 256-240= 16
-
Step 6 : subnet mask
Subnet mask = 255.255.255.240
-
Step 7 : subnets and their characteristics
N° |
NetID
|
IP range |
Broadcast
|
1 |
172.160.16.0 |
16.1-->31.254 |
172.160.31.255 |
2 |
172.160.32.0 |
32.1-->63.254 |
172.160.63.255 |
|
|
|
|
14 |
172.160.224.0
|
224.1-->239.254
|
172.160.239.255
|
- Subnet 172.160.0.0/21
-
Step 1 : IP class
172.160.0.0/21 (classless) --> 172.160.0.0/16 (B- class)
-
Step 2 : host part
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
1 |
1 |
1
|
1
|
1
|
0 |
0 |
0 |
--> 27+26+25+24+23 = 128+64 = 248
-
Step 3 : number of subnets
25-2 = 30 subnets available
-
Step 4 : number of hosts per subnet
211-2 = 2046 hosts per subnet
-
Step 5 : block size
Block size = 256-248= 8
-
Step 6 : subnet mask
Subnet mask = 255.255.248.0
-
Step 7 : subnets and their characteristics
N° |
NetID
|
IP range |
Broadcast
|
1 |
172.160.8.0 |
8.1-->15.254 |
172.160.15.255 |
2 |
172.160.16.0 |
16.1-->23.254 |
172.160.23.255 |
|
|
|
|
30 |
172.160.240.0 |
240.1-->247.254 |
172.160.247.255
|
- Subnet 172.160.0.0/26
-
Step 1 : IP class
172.160.0.0/26 (classless) --> 172.160.0.0/16 (B- class)
-
Step 2 : host part
27 |
26 |
25 |
24 |
23 |
22 |
21 |
20 |
1 |
1 |
0
|
0 |
0 |
0 |
0 |
0 |
--> 27+26 = 128+64 = 192
-
Step 3 : number of subnets
210-2 = 1022 subnets available
-
Step 4 : number of hosts per subnet
26-2 = 62 hosts per subnet
-
Step 5 : block size
Block size = 256-192= 64
-
Step 6 : subnet mask
Subnet mask = 255.255.255.192
-
Step 7 : subnets and their characteristics
N° |
NetID
|
IP range |
Broadcast
|
1 |
172.160.0.64 |
65-->126 |
172.160.0.127 |
2 |
172.160.0.128 |
129-->190 |
172.160.0.191 |
|
|
|
|
1021 |
? |
? |
? |
1022 |
? |
? |
? |
|
Dernière mise à jour : ( 06-06-2008 )
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