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Bob, a stable and handsome young man, comes to the company for the execution of wishes and delivery of all things in Brooklyn's Russian quarter, lays his legs on the table and demands that some Alys from St Petersburg send a message that he immediately dictates to the company manager. The message is available on two hundred pages A4 and the manager swears that everything will be delivered and goes to the next room to send a message.This is the level of application on which the user uses the interface to transfer data to service. In addition to direct contact with the manager, Bob could have called the company or prepared two hundred sheets A4.The manager then sends an application to the processing unit. In this department, specialists take the manuscript, reprint it, complying with all the formatting rules, and the extra piece of paper on which the address is written by the translite so that, on the way from America to Russia, any postman can at least speak it out loud. After that, the responsible leader staggers the blank sheets and brings it together with others to the delivery office.This is a presentation layer that spans the user ' s diverse data into clear structures operated by the service.The Delivery Division receives a veil of sheets, including a letter from Bob. Since Alice is living in another country, the letter must be in line with the documents governing the transfer of shipments from the United States branch to the Russian branch. If no such document is available, the heads of the delivery division shall begin to rewrite by using the following protocols in order to reach consensus prior to the transfer of real shipments.This is a sessional level that is responsible for establishing a link between different copies of the services of the annex. Once a delivery contract has been concluded, the Delivery Division decides how best to deliver the leaves of which the departure is. In order not to send the entire Bob letter in case of loss, it is divided into several separate slates of leaflets, a further sheet is placed at the beginning of each writing to a person (a/a 9042) from whom (a/a 65535) the serial number and the number of sheets in the stack, so the receiving party can receive the sheets arbitrarily and still collect them.It's a transport level. For what he's responsible, I'm not writing to be embarrassed; I think the comments will be more accurate.By dividing the letter into separate stacks, the Delivery Division sends them to the mail, ordering them to St Petersburg. The mail adds to the top another leaf on which it says "Iz Brooklyn, B: St. Petersburg, Leaf: N." The mail would be happy to travel all the way by one mocha, but the delivery addresses share the ocean, and there is no direct message.That's why the mail delivers to the next office towards St Petersburg. The post knows that this office will transfer the shipments to another location at the earliest possible opportunity, and sooner or later the departure will reach the ocean, then cross it, and in St. Petersburg will see the match of the final address, and will be transferred from the warehouse to the customer delivery office, which will be cleared by a/i.This is a network level that is responsible for the interaction of nodes as a single organism. The network level doesn't know anything about the nodes, but it can arrange a shipment from one knot to the other, so the knot can figure out who was sent.Delivery between individual offices is provided by truck drivers. The truck drivers don't know the exact addresses of the offices in other countries, but they know the exact addresses of the neighbouring offices: for example, office No. 1 is on Stremian Street. In addition, truck drivers know the reception protocol and what forms are to be filled.It's a canal level that connects separate nodes.Only physical level remains: when the driver delivers the sheets from point A to point B, they physically move from one place to another.When the floods get physically to Russia, they'll be taken by the truck driver.The truck driver will take them from the port to St Petersburg.The St Petersburg ACC will figure out what the address is for.The address will begin with a set of sheets that make up the letters.Once the letter is complete, it's going to be in the office.The processing department broadcasts the address and sends a letter to the responsible reader.The responsible reader with the expression and the company ' s scheme will read the letter received from Alice.The following pattern is followed:Arbitrary user dataFor transmission, data are converted into clearly defined structuresIn order to transfer the structures, a connection of the services of the annex shall be arrangedInternally transmitted data are placed in transport level packages to ensure data transmission requirementsTransport level packages are transmitted online with final addressEach network hub passes over packages to a comrade closer to the final address.At the physical level, this is converted into a change of voltage at conjectors, radio waves or other data transmission formatI'm most likely to lie, I'm sorry. Don't be embarrassed to edit, if you see the phase.