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OSPF uses which metric to select the best route?

A live video conferencing application sends 12 numbered video frames from Host A to Host B: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Host B receives the frames in this order: 1, 2, 3, 6, 5, 7, 10, 12, 11. Frames 4, 8, and 9 do not arrive. The transport service used by the application does not automatically guarantee ordering, acknowledgments, or retransmission.    a) In what order are the received frames delivered to the application? b) Does the transport service automatically reorder or retransmit the missing frames? c) If the video application needs better reliability, what could it add at the application level? d) Does UDP have built-in congestion control? If No, why can this be a problem?

A network has many devices with unpredictable traffic. Most of the time, only a few devices have data to send. The designer wants to avoid fixed time slots that may go unused. a) Which MAC class could work well when traffic is light and unpredictable? b) Why can this class be efficient under light load? c) What problem can occur when many nodes transmit at the same time? d) What general technique is used after this problem occurs?

A worker at a chemical manufacturing facility was exposed to three solvents: Toluene at 180 ppm (limit 200 ppm), Acetone at 850 ppm (limit 1000 ppm), and Xylene at 95 (limit 100 ppm). What is the employees’ exposure mixture? Em=(C_1∕L_1 )+(C_2∕L_2 )+…+(C_n∕L_n )

Sorbent tubes are often used to sample airborne particulates. 

Inhalable particles are the same size as respirable particles  

The hierarchy of controls prioritizes which of the following? 

A local exhaust ventilation system has an air velocity of 16.25 m/s at the hood face. The hood opening area is 1.50 m². Calculate the volumetric flow rate (Q) in m³/s (Q=V×A)

A toxic effect is: 

Which WBGT formula is used for outdoor environments with a solar load?