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So far Open4Tech Team has created 43 blog entries.

IPv4 Header Explained

In this article, we will explain the header section of an IPv4 packet. The IPv4 header has a variable length of 20-60 bytes, depending on the IP options present. It consists of 14 fields, of which 13 are mandatory. IPv4 Header Format Compared To IPv6 Header Let's take a look at each field individually: Version

2020-05-10T21:24:37+03:00By |Categories: Explained Simply|0 Comments

IPv4 vs. IPv6

An Internet Protocol address (IP address) is a unique numerical identifier used for communication between devices connected to a computer network. It is used for identification and location addressing. To send data from one computer to another, data packets must travel across the network containing the IP addresses of both devices. In 1983, IPv4 was

2020-05-13T23:58:53+03:00By |Categories: Explained Simply|0 Comments

Create a Custom Block for Gutenberg in WordPress

Instead of having one big chunk of content, as it was until Gutenberg had been introduced in Wordpress 5.0, the web page is now segmented into smaller parts, called blocks. The editor provides a wide variety of blocks that you can use across your pages and posts, but since this is WordPress, there’s always room

2020-01-28T08:15:13+02:00By |Categories: WordPress|0 Comments

OSI Application Layer

The application layer is the topmost level of the OSI model and is the only one that directly interacts with the end-user and specifies the shared protocols and interface methods used by hosts in a communications network. It acts as an intermediate between the actual software application and the users. It provides full end-user access

2019-11-18T18:35:17+02:00By |Categories: Explained Simply|0 Comments

OSI Presentation Layer

The sixth layer of the OSI model is the presentation layer. It takes care of the syntax and semantics of the information exchanged between two communicating systems. Its primary goal is to send data in such a way that the receiver will understand and be able to use the information. The presentation layer is responsible

2019-11-13T21:52:40+02:00By |Categories: Explained Simply|0 Comments

OSI Session Layer

The fifth layer of the OSI model is the session layer. It controls the connections between different systems by tracking the dialogs between computers, which are called sessions. A session is a communication channel that gets established between two hosts for the exchange of information for a limited period. It allows the systems to communicate

2019-10-30T22:12:28+02:00By |Categories: Explained Simply|0 Comments

OSI Transport Layer

The fourth layer of the OSI model is the transport layer. Its purpose is to provide secure communication and transparent transmission of the data flow. The data which is received from the session layer is divided into small data units called segments. Each segment contains the sender and receiver port number along with the sequence

2019-10-30T22:19:46+02:00By |Categories: Explained Simply|0 Comments