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 Port Security is a network switch security feature that allows only specific or limited MAC addresses to connect to a switch port and blocks…

HSRP VRRP GLBP What is HSRP HSRP (Hot Standby Router Protocol) is a redundancy protocol developed by Cisco Systems to provide high availability for default gateways in a network. It…