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單項(xiàng)選擇題

Refer to the exhibit.After a RIP route is marked invalid on Router_1， how much time will elapse before that route is removed from the routing table？（）

A.30 seconds
B.60 seconds
C.90 seconds
D.180 seconds
E.240 seconds

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單項(xiàng)選擇題

In which integration method is an IPV6 packet encapsulated within an IPV4 protocol?（）

A.proxy
B.dual-stack
C.tunneling
D.dot1q

單項(xiàng)選擇題

The enable secret command is used to secure access to which CLI mode?（）

A.user EXEC mode
B.global configuration mode
C.privileged EXEC mode
D.auxiliary setup mode