单项选择题

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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）
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
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