[多选] The OSPF hello protocol performs which of the following tasks?（）

A . It provides dynamic neighbor discovery
B . It detects unreachable neighbors in 90 second intervals
C . It maintains neighbor relationships
D . It negotiates correctness parameters between neighboring interfaces
E . It uses timers to elect the router witch the fastest links as the designated router
F . It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF

进行因素分析最常用的方法有两种，即（）。比率分析法。连环代替法。差额计算法。比较分析法。 You have two NTP servers 10.1.1.1 & 10.1.1.2 and want to configure a router to use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which command will you use？简述离子交换纤维素的特点有哪些？ What are three features of the Cisco IOS Firewall feature set？（） network-based application recognition （NBAR）。 authentication proxy。 stateful packet filtering。 AAA services。 proxy server。 IPS。车用气瓶分为气体燃料、（）燃料的车用气瓶。汽油。柴油。液化气体。 The OSPF hello protocol performs which of the following tasks?（）

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[多选] The OSPF hello protocol performs which of the following tasks?（）

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