What is stored in the ARP table of the Internet host? ( )
A. IP addresses
B. MAC addressses
C. the mapping of domain names to IP addressses
D. the mapping of IP addresses to MAC addressses
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Which size of frames are treated as invalid frames? ( )
A. frames smaller than 64
B. frames smaller than 128
C. frames smaller than 100
D. frames smaller than 512
Which of the following MAC addresses is correct?（ ）
A. 00-45-6B-3A-34-2H
B. 192.168.1.55
C. 65-10-96-58-16D
D. 00-06-5B-4F-45-BA
The mask of a subnet is 255.255.255.248. So the subnet at most can connect ( ) hosts.
A. 8
B. 6
C. 248
D. 246
Network core does not include () .
A. routers
B. packet switches
C. links
D. smart phones
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