Ethernet Connector RJ45 Connector What is “RJ45”Do you know the meaning of “RJ45”? Let me explain it.“RJ” is the abbreviation of “registered jack”, which originally means a standardized telecoms network interface…

Transmission Media Transmission Media in Computer Network Introduction The modern global environment is constantly evolving. Data Communication and networking technologies have revolutionized many aspects of modern life. They now depend…

IT Courses What is CompTIA+ What is CompTIA+CompTIA+ refers to a group of IT certifications offered by CompTIA. These certifications are vendor-neutral, meaning they are not limited to one company…

OSPF Commnds Check OSPF configuration, status, and neighbors on Cisco routersshow ip ospf neighbor Displays OSPF neighbors and their current state, including IP addresses, interface, state, and area.Show OSPF Interfaceshow ip…

OSPF DR and BDR OSPF DR and BDRThis lesson demonstrates the OSPF concept of a Designated Router (DR) and a Backup Designated router (BDR). We discuss why we need DR…

How does OSPF work The last lesson introduced the most fundamental OSPF terms, such as LSA, LSDB, SPF, Areas, Cost, and Neighbors. In this lesson, we continue introducing new concepts…

IP Address 1. What is IP AddressAn IP address (Internet Protocol Address) is a unique numerical identifier assigned to every device connected to a network that uses the Internet Protocol…

Data Flow Computer To Internet Data Flow: Computer to Internet (Opening a Website) Data Flow: Computer to Internet (Opening a Website)Example: User opens Google website (https://www.google.com) User Request from Browser…

Wan Technology History of WAN The history of the Wide Area Network (WAN) began in the 1960s, when researchers and governments started developing networks to connect computers over long distances.…

Port Security What is Port Security Introduction With port security, network administrators can limit which devices can connect to which ports on a router or switch. It can stop unauthorized devices from…