单项选择题

Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）

A. Layer 2 TTL
B. Layer 3 TTL
C. Layer 3 source address
D. Layer 3 destination address

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单项选择题

On a Cisco Catalyst 4500 Series, the fail LED is lit for one if its two power supplies. Which command would you use to check on this problem ?（）

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单项选择题

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