多项选择题
What are three functions associated with JUNOS software class of service?（）
A. Log incoming traffic. B. Classify incoming packets. C. Manage outbound bandwidth. D. Manage congestion by intelligently dropping traffic. E. Classify ATM QoS packets into an equivalent IP CoS environment.
单项选择题 In BGP graceful restart, how does a peer router indicate the end of a route exchange?（）
多项选择题 Firewall filters can perform which two actions?（）
单项选择题 What is the function of the helper router during a restart event in OSPF?（）
