A.By perfornubg a show ip interface to see the type and source of the attack based upon the access-listmatches
B.By performing a show interface to see the transmitted load "txload" and receive load "rxload" ;if the interface utilization is not maxed out ,there is no attack underway
C.By setting up an access-list to permit all ICMP,TCP,and UDP traffic with the log or log-input commands,then use the show access-list and show log commands to determine the type and sourceof attack
D.By applying an access-list to all incoming and outgoing interfaces,turning off route-cache on all interfaces,then,when telnetting into the router perform a debug IP packet detail