Day 6 #100DaysofCybersecurity #NetworkSecurity Today, I went further with the OSPF routing protocol by exploring multiaccess network configuration and how to modify a single-area OSPF. I learned how to adjust the reference bandwidth, cost value, hello and dead intervals, as well as default route propagation. @jay_hunts @segoslavia @ireteeh @TemitopeSobulo

Day 5 #100DaysofCybersecurityChallenge #NetworkSecurity I missed out from the beginning of the challenge. Though I joined yesterday night, I was unable to post, so today I had to make up for the days I lost. I started CCNA 3 to round up the CCNA curriculum using the @CiscoNetAcad platform organized by @TechPeakLab. I began with the OSPF routing protocol, an interior gateway protocol used for dynamic routing. I learned about the concept of OSPF, its characteristics, operations, and packets. I also had a deeper dive into OSPF router ID, how to configure point-to-point OSPF networks using the network command with wildcard mask and quad zero, and when best to use either option. I also learned how to configure OSPF using the ip ospf command. Both the network command and the ip ospf command can be used at any time. The difference is that the network command is used in config-router mode, while the ip ospf command is used directly on an interface. Security was also emphasized. I learned how to prevent interfaces from sending hello messages every 30 seconds, which can overload the router, and also stop rogue routers from joining the network and compromising traffic. I was tasked with a practical lab to demonstrate what I had learned. In the topology, R1 was configured using the network command with wildcard mask, R2 using the network command with quad zero, while R3 was configured using the ip ospf command on the interfaces. Finally, security measures were implemented using the passive-interface command to secure links not connected to other routers, preventing rogue routers. @segoslavia @jay_hunts @ireteeh