单项选择题

What refers to the protocols used to determine who goes next on a multi—access channel（）.

A．MAC (medium access contro）
B．ARP (address resolution protoco）
C．NAT (network address translatio）
D．CIDR (classless interdomain routin）

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单项选择题
When a large packet wants m travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into（）.

A．messages
B．frames
C．fragments
D．bits
单项选择题
The operation of the Internet is closely monitored by the routers. When something unexpected occurs, the event will be reported by the protocol（）.

A．IGMP
B．ICMP
C．IP
D．OSPF
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