How to enable the antispoofing on the Cisco ASA firewalls?

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