There are two fundamental protocols in the transport layer 1. TCP Transmission Control Protocol-- connection-oriented protocol 2. UDP User Datagram Protocol -- connectionless protocol Connection-oriented communication : establishes a logical (virtual) connection prior to sending data. Connectionless communication : sends data right away without establishing a logical connection Qn why do we have transport layer protocal? IP provides a weak, but efficient service model (best-effort ) How should hosts send into the network? i.)Flow Control ii.) Too fast is bad; too slow is not efficient IP packets are addressed to a host How to decide which application gets which packets? NOTE TRASPORT LAYER IS RESPONSIBLE FOR PROCESS TO PROCESS DELIVERY PORTS port is a communication endpoints Since there are many applications running on a co...
1. Turn off the iPhone. Press and hold the iPhone's Power button, then swipe the slide to power off switch at the top of the screen right. This will turn off your iPhone, thereby minimizing the chance of an electric shock. 2. Remove your iPhone's SIM card. There is a small hole on the right side of your iPhone, a bit below the Power button; insert a thin object, such as a bent paperclip or a pin, into this hole to eject the SIM tray. Once the SIM tray pops out, simply remove the SIM card and push the tray back in. Make sure you store the SIM card in a dry, clean place. If you have a small plastic bag or container, it's best to store the SIM card there. 3 . Prepare a work surface. You'll want a clean, well-lit, level surface on which to remove your iPhone's display. It will also help to have a soft item, such as a clean microfiber towel, on which you can rest your iPhone screen side-down. Consider giving the surface a good wipe-down with a damp rag and let...