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單項選擇題

A layer 3 switch can move packets between subnets based on which of the following criteria?（）

A. 802.1q tag
B. Port
C. Application
D. IP address

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單項選擇題

Which of the following is an invalid IPv4 address?（）

A.225.0.0.1
B.254.254.0.0
C.256.0.0.4
D.224.2.1.4

單項選擇題

An administrator needs to update a router configuration for a router that does not support SSH.Which of the following can be used to securely update the router configuration?（）

A.FTP
B.SNMPv2
C.TFTP
D.KTTPS

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