where do we use wild card bits ? as far as i know we use it in ospf and ACL . where else do we use it ?
Yo can find those answers here: http://www.ciscopress.com/store/ccna-routing-and-switching-200-125-official-cert-guide-9781587205811
Also in EIGRP, EIGRP and OSPF accept the subnet mask but once it was submitted the protocol convert the subnet mask to wildcard.