Subnet Mask Review Page 2
ADVERTISEMENT
1
2
3TCP/IP Subnet Mask Review
Thomas Jerry Scott
Page 2 of 3
Subnet Mask Table
Decimal
Binary
# of 1’s
# of 0’s
value
255
1111 1111
8
0
254
1111 1110
7
1
252
1111 1100
6
2
248
1111 1000
5
3
240
1111 0000
4
4
224
1110 0000
3
5
192
1100 0000
2
6
128
1000 0000
1
7
0
0000 0000
0
8
Some Example Masks
Mask Value
#1’s in
#0’s in
Dotted Decimal
/n
Mask
Mask
/11
11
21
255.224.0.0
/18
18
14
255.255.192.0
/20
20
12
255.255.240.0
Quiz 2. Determine the following subnet masks
/12
12
20
255.
. 0 . 0
/21
21
255. 255.
. 0
/29
29
255. 255. 255.
/30
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education