The task of each layer is to provide service to a higher (higher) layer. Two computers
in the communication between the layers respectively; At the same time, layers at the same level do not directly communicate, but a virtual communication occurs between them.
Figure: Between Two Computers; The relationship between layers real (vertical) and virtual (horizontal)

The data is divided into packets before data is transmitted from one layer to another. The packet is a volume of data used to transfer data from one device to another. Additional information (formatting or addressing) is added to the package in each layer.
The transmission of the data is from the upper layer to the lower layer. Data transmission via cable
by layer. On the other computer, the data that is met by the physical layer first moves to the upper layers.

OSI Model
OSI (Open Systems Interconnection) model ISO (International Standards Organization)
and the way I work between the two computers. First
This standard, which was introduced in 1978, was revised in 1984 and
(Open System Interconnect) as a reference model. Model widely
and has been a guideline for networking.
The OSI Model is specific to any hardware or network. The aim of the OSI network
it provides the use of architects and protocols as a network product business.
ISO standards follow a complex path while maintaining business on the network. ISO standard
the new layer (subroutine). The following seven layers as OSI models are:

MODUL 1: Network Basics

• Basic knowledge.
• To explain the layered model.
• Describe the OSI reference model.
• Describe the network specificity of the layers.
• Explain the Cisco Three-Layer Model.
• Connect Cisco devices.

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Cisco © produces network devices such as Hub, Router, Switch.
The first computer networks were realized among the companies’ own products. for example
IBM operating systems using IBM network devices
they could.
The OSI model allowed manufacturers to produce interoperable network devices. She
model on a computer, other over network media (media)
the transfer to the application on the computer.

Ubiquiti NetworksUBNT is a US brand that manufactures wireless network devices. UBNT, also called Ubiquiti Networks, was founded in 2011 in Silicon Valley. The founder of the UBNT brand is Robert J. Pera. Pera is an electrical engineer who grew up in Silicon Valley and specialized in digital communications and circuit design. Apple Inc. Pera started her first business with her firm and has worked under the FCC to facilitate access to and increase the communication network of devices, in areas without telephone and Wi-Fi access. The experience with Steve Jobs has opened a new horizon to Pera and decided to develop low-cost, high-performance WiFi modules. Foundations of UBNT were laid in 2005 with this idea. The aim was to deliver Wi-Fi technology to rural areas through wireless access infrastructure.

RouterOS supports many applications used by Internet service providers, for example, OSPF, BGP, Multiprotocol Label Switching (VPLS/MPLS), OpenFlow. The product is supported by Mikrotik through a forum and a wiki, providing assorted and thematic examples of configurations. RouterOS supports Internet Protocol Version 4 (IPv4) as well as Internet Protocol Version 6 (IPv6).

The software provides support for virtually all network interfaces that the Linux kernel 3.3.5 supports, except wireless, where the Atheros chipsets are the only supported hardware, as of RouterOS version 6.3