数据链路层在局域网参考模型中被分成了两个层：MAC层与【6】层。_爱下问搜题

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问题填空题

数据链路层在局域网参考模型中被分成了两个层：MAC层与【6】层。

答案

参考答案：LLC

解析：数据链路层在局域网参考模型中被分成了MAC层与LLC层。LLC层完成通常意义下的数据链路层功能，如差错控制和流量控制等。

阅读理解

阅读上面的材料, 完成下列句子。( 每空一词)

Here are reports of three attacks (攻击). Three swimmers were attacked by sharks (鲨鱼) because
they didn't obey (遵守) the safety rules for swimmers.

Rules for swimmers:
1. Don't swim at night.
2. You are more likely to be attacked in warm water.
3. Sharks are attacking by blood (血). Don't swim with an open cut(划口).
4. It's best to wear a swimming suit to match (与……相配) your skin colour. Sharks can see colours.
5. If you see a shark, don't be nervous. Try to swim quietly, with even (平稳的) strokes (划水动作).

     Report 1: Colin was swimming with two friends very late at night. He was attacked by a shark and
died.
     Report 2: Ann was a very good swimmer. She bought a new bright red swimming suit. She was
swimming with some friends when a shark attacked her.
     Report 3: Jack was on holiday in Australia. He cut his foot on the beach. He went swimming the
same day and got attacked.

1. Colin was attacked by a shark and died because he was swimming with two friends very
late at ________.
2. It's not a good idea to wear a ________ red swimming suit like Ann, because sharks can see colours.
3. You mustn't go swimming with an open _________.
4. If you see a shark, try to swim ________, with even strokes.
5. You can be _________ only if (只要) you obey the safety rules for swimmers.

填空题

若方案现值指数小于1，说明（），故方案不可行。