The IOS is intelligent in this respect. The correct syntax is to use the wildcard mask as you indicated in your example. However, if you use the subnet mask, the parser will automatically convert it to a wildcard mask.
For example, if you configure 'network 172.19.0.0 255.255.0.0', the parse will convert it to 'network 172.19.0.0 0.0.255.255'.
To sum up, either form is acceptable.
Hope that helps - pls do rate the post if it does.
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