This tutorial explains EIGRP Composite Metric calculation formula and components (K1– Bandwidth, K2-Load, K3-Delay, K4-Reliability and K5-MTU) step by step in detail with examples. Learn how EIGRP Composite Metric Formula calculate and select the shortest path to reach the destination.

This tutorial explains how to configure EIGRP Routing protocol in Cisco Routers step by step with practical example in packet tracer. Learn EIGRP configuration commands, EIGRP show commands, EIGRP network configuration (with & without wildcards) and EIGRP routing (classful & classless) in detail.

This tutorial explains OSPF terminology (AS Number, Public AS Numbers, Private AS Numbers, Area, Backbone, Area off Backbone, ABR, IR, Link, State, LSA and LSDB) including basic concepts of OSPF routing protocol, advantage & disadvantage of OSPF and difference between AS and Area in detail with examples.

This tutorial explains OSPF Neighborship requirements (Area ID, Network ID, Authentication, Hello and Dead Intervals, Stub Flag and MTU Size) and conditions in detail with examples. Two routers cannot become OSPF neighbor until these configuration values match on both routers.

This tutorial explains OSPF Neighbor States (Down state, Attempt/Init state, Two ways state, Exstart state, Exchange state, Loading state and Full state) and neighbor discovery process (selecting RID, DR &BDR election process, Adjacent and Adjacency) step by step with examples in easy language.

This tutorial explains how to configure OSPF Routing protocol step by step with practical example in packet tracer. Learn OSPF configuration commands, OSPF show commands, OSPF network configuration (Process ID, Network ID, Wild card mask and Area number) and OSPF routing in detail.

This tutorial explains OSPF Metric calculation formula and SPF algorithm step by step in detail with examples. Learn how SPF (Shortest Path First) algorithm calculates cumulative cost of route to build the Shortest Path Tree (SPT) and how OSPF Metric Formula can be manipulated by changing reference bandwidth value.

This tutorial explains network security threats (hardware & software), types of network security attacks (such as Active & Passive attack, insider & outsider attack, Phishing, Hijack, Spoof, Buffer overflow, Exploit, Password, Packet capturing, Ping sweep, DoS attack etc.) and their possible solutions in detail.

This tutorial explains basic concepts of Cisco Access Control List (ACL), types of ACL (Standard, Extended and named), direction of ACL (inbound and outbound) and location of ACL (entrance and exit). Learn what access control list is and how it filters the data packet in Cisco router step by step with examples.

This tutorial explains Standard Access Control List configuration commands (with options, parameters and arguments) in detail with examples. Learn how to build a standard ACL (Numbered and Named) condition or statement and how to calculate the wildcard mask for Standard ACL configuration commands step by step.