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

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

多项选择题Which two statements are true about precedence values in policy?（） (Choose two.)

A. 1 is the default precedence.
B. A lower number is preferred.
C. A higher number is preferred.
D. 100 is the default precedence.

多项选择题Which three statements are correct about Rate Limiters? （）(Choose three.)

A. one-rate rate limiters
B. two-rate rate limiters
C. two-rate rate limiters is the default
D. one-rate rate limiters is the default
E. there is no default it must be configured

单项选择题Which utility is used to assign a flow of data to a traffic class?（）

A. ip profile
B. policy-list
C. classifier-list
D. rate-limit-profile