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IP Addresses
CCNA
|
2^7 |
2^6 |
2^5 |
2^4 |
2^3 |
2^2 |
2^1 |
2^0 |
|
128 |
64 |
32 |
16 |
8 |
4 |
2 |
1 |
2^8 256
2^9 512
2^10 1024
2^11 2048
2^12 4096
2^13 8192
2^14 16384
2^15 32768
Number of usable hosts 2^N-2 (N=mask bits)
Number of usable networks 2N-2 (N=mask bits) cant use 0 or 1 per RFC
can't use 0, (ip subnet 0)
CCNA
2^N-2 128 64 32 16 8 4 2 1
| Bit Pattern |
Masked Bits |
2^5 | 2^4 | 2^3 | 2^2 | 2^1 |
|
11000000 |
2 | 32 | 16 | 8 | 4 | 2 |
| 11100000 | 3 | |||||
| 11110000 |
4 |
|||||
| 11111000 | 5 | |||||
| 11111100 |
6 |
|||||
|
11111110 |
7 |
|||||
| 11111111 |
8 |
Provided Subnets
2
6
14
30
62
126
254
Subnet Mask
192
224
240
248
252
254
255
Class A Hosts
Class B Hosts
16382
8190
4094
2046
1022
510
254
Class C Hosts
62
30
14
6
2
0
0
Default Subnet Masks
Class
A 255.0.0.0 1-127
B 255.255.0.0 128-191
C 255.255.255.0 192-223
Where do you draw the line? (Mask)
11111111 11111111 11111111 11111111
End of CCNA
Decimal/Binary/Hex conversion
Binary 128 64 32 16 8 4 2 1
Hex (0x--) 8 4 2 1 8 4 2 1
|
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
A (10) |
B (11) |
C (12) |
D (13) |
E (14) |
F (15) |
|
0000 |
0001 |
0010 |
0011 |
0100 |
0101 |
0110 |
0111 |
1000 |
1001 |
1010 |
1011 |
1100 |
1101 |
1110 |
1111 |
|
subnet mask bits have to be contiguous |
/24 bit = 0 = 0000 0000 |
128 = 1000 0000 |
192 = 1100 0000 |
224 = 1110 0000 |
|
/28 bit = 240 = 1111 0000 |
248 = 1111 1000 |
/30 bit = 252 = 1111 1100 |
254 = 1111 1110 |
/32 bit = 255 = 1111 1111 |
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