多项选择题

Which two features protect the ERX Edge Router from denial-of-service attacks? （）(Choose two.)

A. rate limiting of ICMP
B. RADIUS authorizations
C. source address validation
D. stateful firewall on the router

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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?（）

A. ip sa-validate
B. ip split-horizon
C. ip access-routes
D. ip filter-options
单项选择题
What are the maximum number of classifiers per policy group?（）

A. 100
B. 128
C. 256
D. 512
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