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

A. ip sa-validate
B. ip split-horizon
C. ip access-routes
D. ip filter-options

单项选择题

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

多项选择题

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