Briefly Describes the Difference Between Storage Area Networks (Sans) and Network Attached Storage (Nas) System?

Briefly describes the difference between Storage Area Networks (SANs) and Network Attached Storage (NAS) system? Storage Area Networks (SANs) | Network Attached Storage (NAS) system | A SAN is a dedicated network that provides access to various types of storage devices including type libraries, optical juke boxes and disk arrays. | Network Attached storage system are networked appliances which contain one or more hard drives that can be shared with multiple heterogeneous computers. | A SAN is a local network of multiple devices that operate on disk blocks. | A NAS is a single storage device that operate on data files | A SAN commonly utilizes Fibre Channel interconnects. | A NAS typically makes Ethernet and TCP/IPconnections. |

Identify and briefly describe each of TCP/IP’S five layer? The basic structure of communication networks is represented by the Transmission Control Protocol/Internet Protocol (TCP/IP) model. This model is structured in five layers. An end system, an intermediate network node, or each communicating user or program is equipped with devices to run all or some portions of these layers, depending on where the system operates. These five layers, are as follows:
Application layer
Host to host or transport layer
Internal layer
Network access layer
Physical layer

Physical layer: The physical layer covers the physical interface between a data transmission device and a transmission medium or network. This layer concerned with specifying the characteristics of the transmission medium the nature of the signals the data rate and related matters. Application layer The Aplication layer, determines how a specific user application should use a network. Among such applications are the Simple Mail Transfer Protocol (SMTP), File Transfer Protocol (FTP), and the World Wide Web (WWW) . Host to host or transport layer The Transport layer, lies just above the network layer and handles the details