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网络设备在什么情况下发送ARP Request?

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网络设备在什么时候会产生免费ARP？

Lesson 4 Listen to the ATIS and fill in the blanks-2 This is Frankfurt Terminal Information 1 at time 2Runway 3 for arrivals ,Runway 25 and Runway 4 for departuresWind 5 degrees, 6 knots,crosswind Runway 18 , 7 knotsRunway wet with wet 8 ,braking action 9QNH 10 millibars or 11 inchesTemperature minus 12Cloud 13 at14feet ,broken 15 feetVisibility reduced in passing snow storsRVR Runway 25 left 16 meters touchdown （接地点）, 17 mid-point （中间区）, 18 stop end （端头）RVR Runway 18 ,600 meters all zonesTransition level 过度高度层 19

Lesson 4 Listen and Copy ATIS-5[音频]Athen1. information : ___2. Time: hours3. wind: _degrees; 4. __ ktsCAVOK5. Temperature: 6. QNH: _millibars = 7. __inches8. transition level : _9. runway in use : other operation information : Taxiway10. _between runway 11. and taxiway 12. is closed.It is reminded to follow strictly noise abatement procedures (降噪程序）

Lesson 4 short exchange listening-1

A. 121.9
B. loud and clear
C. 5
D. 129.0