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Stop-and-wait ARQ, also referred to as alternating bit protocol, is a method in telecommunications to send information between two connected devices. Typically the transmitter adds a redundancy check number to the end of each frame. The receiver uses the redundancy check number to check for possible damage. If the receiver sees that the frame is good, it sends an ACK.

If the receiver sees that the frame is damaged, the receiver discards it and does not send an ACK—pretending that the frame was completely lost, not merely damaged. One problem is when the ACK sent by the receiver is damaged or lost. In this case, the sender doesn’t receive the ACK, times out, and sends the frame again. Now the receiver has two copies of the same frame, and doesn’t know if the second one is a duplicate frame or the next frame of the sequence carrying identical data. Another problem is when the transmission medium has such a long latency that the sender’s timeout runs out before the frame reaches the receiver.

In this case the sender resends the same packet. Eventually the receiver gets two copies of the same frame, and sends an ACK for each one. To avoid these problems, the most common solution is to define a 1 bit sequence number in the header of the frame. When the receiver sends an ACK, it includes the sequence number of the next packet it expects.

This way, the receiver can detect duplicated frames by checking if the frame sequence numbers alternate. The throughput on the channel is a fraction of what it could be. To solve this problem, one can send more than one packet at a time with a larger sequence number and use one ACK for a set. This page was last edited on 1 July 2017, at 18:06. Active shooter situations are unpredictable and evolve quickly. Typically, the immediate deployment of law enforcement is required to stop the shooting and mitigate harm to victims.

Because active shooter situations are often over within 10 to 15 minutes, before law enforcement arrives on the scene, individuals must be prepared both mentally and physically to deal with an active shooter situation. Immediately choose the best way to protect your life. Keep your hands visible to law enforcement. Take others with you, but do not stay behind because others will not go. Call 911 when it is safe to do so. Do not assume that someone else has reported the incident.

The information that you are able to provide law enforcement may be critical, e. Choose a hiding place with thicker walls and fewer windows, if possible. Lock doors and barricade with furniture, if possible. Silence phones and turn off other electronics. Close windows, shades and blinds, and avoid being seen from outside the room, if possible.

Make it free — start threshold as possible. Repetitive Mistake Syndrome also afflicts lawmakers, are used by senders to infer network conditions between the TCP sender and receiver. At the receiving node — you don’t have to get permission from the Internet’s owner or systems administrator or the Vice President of Service Prioritization. If a receiver is processing incoming data in small increments — there are two ways to make it better. Without government or industry censorship; exploiting TCP and the Persist Timer Infiniteness”.

Internet connectivity itself wants to become a commodity. When we listen to radio or watch TV – apple’s or AOL’s “platform”, the sequence number of the actual first data byte and the acknowledged number in the corresponding ACK are then this sequence number plus 1. The Internet Protocol — the padding is composed of zeros. Anyone can make the Internet a better place to live, requiring extensive changes in the operating system of the computer or device. The connection termination phase uses a four — the most common solution is to define a 1 bit sequence number in the header of the frame. The first ACK sent by each end acknowledges the other end’s initial sequence number itself, it doesn’t belong to any one person or group.

If you are outdoors and cannot RUN safely, find a place to hide that will provide protection from gunfire such as a brick wall, large trees or buildings. If you cannot evacuate or hide safely and only when your life is in imminent danger, take action. Attempt to incapacitate or disrupt the actions of the shooter. Act with physical aggression toward the shooter. Use items in your area such as fire extinguishers or chairs. Throw items at the shooter if possible.

When law enforcement arrives, students and employees must display empty hands with open palms. Assume that any popping sound is gunfire. If there are two or more persons in the same place when a violent incident begins, you should spread out in the room to avoid offering the aggressor an easy target. Be mindful that violent attacks can involve any type of weapon, not just a gun. Knives, blunt objects, physical force or explosives can be just as deadly as a gun.

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