多项选择题
A. rate limiting of ICMP
B. RADIUS authorizations
C. source address validation
D. stateful firewall on the router
单项选择题 Which configuration command allows the ERX Edge Router to perform Unicast Reverse Path Forwarding lookups on all packets received on an IP interface?（）
单项选择题 What are the maximum number of classifiers per policy group?（）
多项选择题 Which two statements are true about precedence values in policy?（） (Choose two.)