Linux, Windows, Security, Programming, Network Tutorials
Computer networks uses different port in order to provides different services and protocols. The port 20 is a popular port which is used by the FTP as data transfer. The TCP and UDP port 20 is dedicated for the FTP protocol data transfer. The FTP protocol uses a pair of connections to manage and transmit … Read more
Open Systems Interconnection Model or OSI Model is an architecture to specify computer networks functions in a clear and compatible way. OSI provides interoperability of diverse communication systems with standard communication and transmission architecture, layers, and protocols. OSI History In the early- and mid- 1970s the computer networks largely owned and operated by the governments … Read more
Windows operating system uses Winsock technology in order to maintain network and internet communication and connection. During the usage of the Winsock especially in heavy usage, it may create network and internet connection problems because of the crash. In this tutorial, we will learn how to reset the network adaptor and TCP/IP network stack via … Read more
Simple Network Management Protocol aka SNMP is used to monitor and manage devices over the computer networks. SNMP is popularly used to monitor network devices. SNMP protocol communication is done over the SNMP ports which can be different according to operation and security. SNMP Ports SNMP uses UDP 161 by default. UDP is an alternative … Read more
Today Firewall is depicted as the main component of the security and networks. Firewalls provide a lot of different operations and features. In the old days, the firewall was simply used to block or allow some ports and management of the NAT. These days there are a lot of different threats where the firewall is … Read more
Network Address Translation a.k.a. NAT is a process or technique used to change IP address and TCP port numbers by an intermediate device like firewall, router, modem, etc. There are different use cases for NAT but the most popular one is to use a single WAN IP address for multiple servers and clients which is … Read more
Domain Name System aka DNS is used to match domain names to the IP addresses. DNS is provided over the intranet and internet servers with different port numbers.DNS can use both transmission protocols TCP and UDP. But general usage is over UDP protocol because of its simplicity and speed. TCP Port 53 One of the … Read more
DNS is used to translate between a human-readable name like poftut.com and IP address like 45.79.1333.118. DNS can use both UDP and TCP protocols but generally, UDP protocol is preferred. In this tutorial, we will learn how to flush, clear the DNS cache with ipconfig /flushdns command. This tutorial can be applied to the All … Read more
The socket is a mechanism that provides a connection between the two-processor system by using network stacks. In a more clear way, we can use sockets to communicate and transfer data between two systems. As we know Unix and Linux systems work on file logic. Everything in the operating system is a file where network connections … Read more
Nmap is a very useful and popular tool used to scan ports. Nmap by default scans the most popular 1000 ports. We may need to change the port range and protocol type to all while scanning with Nmap. Scan All TCP Ports with Range We can specify the port range with the -p option. As we … Read more