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OSPF DR and BDR

OSPF DR and BDR OSPF DR and BDR This lesson demonstrates the OSPF concept of a Designated Router (DR) and a Backup Designated router (BDR). We discuss why we need DR and BDR in the first place. Then...

How does OSPF work

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 and terms while...

What is IP Address

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

Complete end-to-end Data Flow

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...

Wan Technology

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. One...

What is Port Security

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 or disables the port...

HSRP VRRP GLBP

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 allows two or more...

MPLS

There are five core tasks we need to accomplish to get an MPLS VPN up and running: show mpls ldp neighbor show mpls forwarding-table Create VRFs and assign routed interfaces to them. Configure MP-BGP...

What is GLBP Gateway Load Balancing Protocol

Cisco GLBP Protocol Gateway Load Balancing Protocol (GLBP) is one of First Hop Redundancy Protocol (FHRP) which provides redundancy like other First Hop Redundancy Protocol, also provides load...