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IP Addressing and Subnetting 253
Address (Step 1)
130.4.101.129
Mask (Step 2)
255.255.252.0
Interesting octet (Step 3)
3
Multiplier (Step 4)
256 ­ 252 = 4
Subnet (boring octets to the left) (Step 5)
130.4.____._____
Subnet (boring octets to the right) (Step 6)
130.4._____.0
Subnet (Step 7)
130.4.100.0
Address (Step 1)
199.1.1.4
Mask (Step 2)
255.255.255.224
Interesting octet (Step 3)
4
Multiplier (Step 4)
256 ­ 224 = 32
Subnet (boring octets to the left) (Step 5)
199.1.1.____
Subnet (boring octets to the right) (Step 6)
199.1.1._____
Subnet (Step 7)
199.1.1.0
Address (Step 1)
172.100.201.2
Mask (Step 2)
255.255.254.0
Interesting octet (Step 3)
3
Multiplier (Step 4)
256 ­ 254 = 2
Subnet (boring octets to the left) (Step 5)
172.100.____.____
Subnet (boring octets to the right) (Step 6)
172.100.____.0
Subnet (Step 7)
172.100.200.0
Address (Step 1)
17.9.44.70
Mask (Step 2)
255.255.255.192
Interesting octet (Step 3)
4
Multiplier (Step 4)
256 ­ 192 = 64
Subnet (boring octets to the left) (Step 5)
17.9.44.____
Subnet (boring octets to the right) (Step 6)
17.9.44.____
Subnet (Step 7)
17.9.44.64
ch05.fm Page 253 Monday, March 20, 2000 5:06 PM