Please read these instructions to find a satellite photo image of your home town: Put your mouse cursor near your location, click down and drag to the middle. Alternatively, type the name of your location here: Centre the map around. Now enlarge the map scale by using the + sign on the upper left side of the map. Click on this and the map will enlarge. Repeat the process of mouse dragging to centre the map as necessary. Choose the Map, Satellite or Terrain photo image as you get closer and hopefully you will find your town.
The protocol to which the rule will apply must be specified. Most often, this is TCP, UDP, or ICMP, but other protocols such as ESP, AH, and GRE are regularly encountered when dealing with VPNs. Some confusion arises when a person is really unsure of what protocol to use.
TCP is a reliable stream delivery service which guarantees that all bytes received will be identical with bytes sent and in the correct order. Since packet transfer by many networks is not reliable, a technique known as 'positive acknowledgement with re-transmission' is used to guarantee reliability.