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單項選擇題

In PIM-SM operations，to which device does the first router that connects with the multicast source sendthe register message？（）

A.RP
B.multicast source
C.IGMP router
D.multicast receiver
E.PIM designated router

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單項選擇題

What are the default values for GRE tunnel keeplive time and number of retries？（）

A.5 seconds and 3 retries
B.10 seconds and 5 retries
C.10 seconds and 3 retries
D.20 seconds and 5 retries
E.5 seconds and 5 retries

單項選擇題

How many messages does Internet Key Exchange use to negotiate SA characteristic when it runs inaggressive mode？（）

A.3
B.4
C.5
D.2
E.6

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