Five Layer TCP/IP Network Model Layering is a common approach to tackling large problems in Computers. There are a few common ways of dividing responsibilities on the Internet. One of the most often used is the TCP/IP Five Layer Model. 1. Go online and read up on the TCP/IP Five Layer Model. In your own words write a brief description of the responsibilities of each layer. Figure 4.7 Host computer 1 Routing Messages over the Internet The Internet routes data packets Host computer 2 over the network backbone from router to router to reach their destinations. Router/Gateway Router/Gateway Host computer 3 Router/Gateway Router/Gateway Router/Gateway Host computer 4 2. Looking at the picture above: Host Computer 1 and 2 are on network A, while Host Computer 3 and 4 are on network B. The Router/Gateways in between represent other networks on the internet. If Host 1 is talking with Host 4 using VOIP or Chat, give an example of how each layer plays its part in the communication.

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Basic SQL Queries

Structured Query Language is the full form of SQL. It is a high-level language used to communicate with a relational database. It is used for creating, storing and accessing contents of a relational database. SQL is used to write the queries which are executed using database engines like Oracle, SQL Server and so forth.