单项选择题 An IS-IS router is adjacent to and passing traffic with a neighbor. You perform a show isis interface detail command and notice that for some interfaces you have a circuit type of 3. Which IS-IS level(s) is enabled on these interfaces?（）

单项选择题 Which method should be used to dynamically elect an RP when your network is using PIM version1?（）

单项选择题 By default, what does a Juniper Networks router set the BGP origin code to when originating theroute?（）