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单选题
Which of the following address formats uses 32-bit addressing?（）
A
IPv4
B
MAC address
C
IPv6
D
Host address
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单选题Which of one the following fields is contained within an IEEE Ethernet frame header?（）A
source and destination MAC addressB
source MAC address and destination network address onlyC
source and destination network address onlyD
source network address and destination MAC addressE
source and destination MAC address and source and destination network address
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单选题R1 forwards a packet from Host 1 to remote Server 1. Which statement describes the use of a MAC as the frame carrying this packet leaves the s0/0/0 interface of R1（）。A
The frame does not have MAC addresses.B
The source MAC address in the frame is the MAC address of the NIC of Host 1.C
The source MAC address in the frame is the MAC address of the s0/0/0 interface of R1.D
The destination MAC address in the frame is the MAC address of the NICof server 1.E
The destination MAC address in the frame is the MAC address of the s0/0/0 interface of R2
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单选题Host 1 receives a file from remote server 1. Which MAC address appears as the source address in the header of the frames received by Host 1（）。A
The MAC address of the NIC in Host 1B
The MAC address of the NIC in server 1C
The MAC address of the Fa0/0 interface of router R1D
The MAC address of the s0/0/0 interface of the router R2
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