Wild cards

[Abhilash MP]

Friends,

Could any one will give clear idea what exactly means Widlcards (Route and translation patterns) and wildcard mask (Subnettings).

Thanks for your advance responce

Regards,

Abhilash

penchala.abhilash02@gmail.com

[Chris Deren · Accepted solution]

Wildcard is any digits, which on Cisco CUCM is indicated by X chanracterm and on voice GW is . (dot).  This matches any digit 0-9, #,*.

HTH,

Chris

[Abhilash MP]

We appreciate you for immediate response; if it possible could you please give explanation about Wild card mask in the network subnetting.

[Leo Salcie Tejeda · Accepted solution]

Hi Abhilash,

This wildcard is deducted by inversing a subnet mask.

On Cisco router, wildcard subnet mask is used in the following occasion

* Defining subnet in ACL

* Defining subnet member in OSPF area

For those who just learn networking, wildcard subnet mask is new and probably looks confusing. Don't worry, there is easier way to understand it.

Background Theory

For example, let's say you have the following subnet.

192.168.24.0/24

or 192.168.24.0 with 255.255.255.0 subnet mask

The binary format of the subnet mask is the following

11111111.11111111.11111111.00000000

In binary arithmetics, inverse a number means "flipping" one state to the other (i.e. from "on" to "off", from "0" to "1").

The inverse of the subnet mask in binary format is then the following

00000000.00000000.00000000.11111111

In decimal format, the inverse subnet mask looks like this

0.0.0.255

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[Abhilash MP]

Leosalcie,

A very good explanation witha perfect example and an apt explanation. so Wild card mask tells the number host in a subnet can we tell like this. Please try to modify if my understanding is wrong.

Thank you,

Abhilash