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单选题
Which OSI layer header contains the address of a destination host that is another network?（）
A
application
B
presentation
C
session
D
transport
E
network
F
data link
G
physical
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单选题During the IPv6 address resolution， a node sends a neighbor solicitation message in order to discover which of these？（）A
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单选题At which layer of the OSI model is the optimal path to a network destination determined at?（）A
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The Layer 2 multicast address of the destination nodeB
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单选题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 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 destination address
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