单项选择题
Which of one the following fields is contained within an IEEE Ethernet frame header?（）
A. source and destination MAC address
B. source MAC address and destination network address only
C. source and destination network address only
D. source network address and destination MAC address
E. source and destination MAC address and source and destination network address
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A.NT2
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C.TE
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E.TE1 -
多项选择题
What functions do routers perform in a network?（）
A. Packet Switching
B. Access Layer Security
C. Path Selection.
D. VLAN Membership Assignment.
E. Bridging between LAN segments.
F. Micro-segmentation of Broadcast Domains. -
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If NVRAM lacks boot system commands, where does the router look for the Cisco IOS by default?（）
A.ROM
B.RAM
C.Flash
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