Unicast Reverse Path Forwarding (uRPF) can be used to help limit malicious traffic on a network. This feature works by enabling a firewall to verify the reachability of the source address in packets being forwarded. This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded.
ciscoasa(config)#ip verify reverse-path interface <interface_name>
For CCNP Security preparation CSPFA (Cisco Secure PIX Firewall Advanced) is the excellent book and it is must have book if you are studying Cisco ASA/PIx firewalls