Here you can find my explanations and videos from my packet tracer labs. Each project has will have multiple videos that show off full system functionality. More Projects will be added, these ones take longer because they have to be recorded.
This topology presented several challenges and complexities, comprising three OSPF areas: 0, 1, and 2. While the CCNA exam primarily focuses on single-area OSPF, this multi-area configuration offers significant advantages. OSPF provides excellent scalability and, as an open standard, it is compatible with a variety of vendors, such as Juniper. Additionally, OSPF supports MD5 encryption for enhanced security. However, there are downsides to consider. OSPF can place a heavier load on router CPUs due to the management of extensive data; the Link State Database (LSDB) acts as a "map" of the entire area. Furthermore, Dijkstra's Algorithm requires more processing power because of its inherent complexity. Although other protocols, like RIP, could have been implemented in this network, they lack the scalability that OSPF provides.
This network utilizes Open Shortest Path First (OSPF) and Hot Standby Router Protocol (HSRP). HSRP enables multiple routers to function as default gateways, ensuring high availability in the event of a router failure. While HSRP provides significant benefits, it also has some limitations. As a Cisco proprietary protocol, it is only compatible with Cisco environments. Additionally, HSRP can introduce increased latency, and its load balancing capabilities are limited, as only one router can be active at any given time. This can lead to higher CPU and memory usage, which may pose challenges in resource-constrained environments. However, the advantages of HSRP generally outweigh its drawbacks.