|
|
发表于 2009-3-13 11:07:24
|
显示全部楼层
The RFCs say that you can’t have only 1 bit for subnetting, since that would mean that the
subnet bit would always be either off or on, which is illegal.
Binary Decimal Shorthand
---------------------------------------------------------
10000000 = 128 /25 (Not valid on the Cisco exams!)
11000000 = 192 /26
In production, you can use 1 bit for assigning subnets. This is called subnet-
zero. But know that Cisco doesn’t consider subnet-zero valid on any of their cer-
tification exams!
呵呵，是我记错了 |
|
