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Subnet Mask

CIDR Value

255.248.0.0

/13

255.252.0.0

/14

255.254.0.0

/15

255.255.0.0

/16

255.255.128.0

/17

255.255.192.0

/18

255.255.224.0

/19

255.255.240.0

/20

255.255.248.0

/21

255.255.252.0

/22

255.255.254.0

/23

255.255.255.0

/24

255.255.255.128

/25

255.255.255.192

/26

255.255.255.224

/27

255.255.255.240

/28

255.255.255.248

/29

255.255.255.252

/30

TABLE 3.2

CIDR Values (continued)

Subnetting Basics

111

No, you cannot configure a Cisco router using this slash format. But wouldn’t that be nice? Nevertheless, it’s really important for you to know subnet masks in the slash notation (CIDR).

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