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  • Writer's picturePacket Pundit

Part 5: IPv4 Routing

Updated: Aug 29, 2023

Hello, again my networkers! :P

Welcome back to our running series of "what did we study this weekend?!" This weekend, Blake and I delved deep into the world of IPv4 Routing, and here’s a summary of our exploration:


Chapter 15: Operating Cisco Routers

This chapter gives you a holistic view of Cisco routers, starting from their physical installation to their logical configurations.

  • Router Installations: Whether you’re setting up an enterprise router or a SOHO (Small Office/Home Office) variant, the chapter discusses the nuances of each. The Cisco Integrated Services Routers stand out for their multi-functional capabilities.

  • Router Interfaces: Once the physical setup is done, we learned about the different interfaces on a router, their status codes, IP addresses, and specialized configurations like bandwidth and clock rate on serial interfaces.

  • Router CLI: Cisco’s command line interface is the gateway to configuring and monitoring routers, and we delved deep into its intricacies.

Chapter 16: Configuring IPv4 Addressing and Static Routes

Here, we focused on what a static route was, and what happens when they are configured on Cisco Routers.

  • The IP Routing Process: We detailed every step, from how a host forwards an IP packet to its default router, to how a router decides where to forward the packet.

  • Static Routes: We also covered different types of static routes like network, host, floating, and default routes, along with troubleshooting tips for each.

  • Interpreting the IP Routing Table: Tools like show ip route help us understand routing better.

Chapter 17: IP Routing in the LAN

In this chapter, we discussed why and how you could configure routing within a LAN.

  • Router-on-a-stick (ROAS): This method involves VLAN routing using 802.1Q trunks, where we learned both configuration and verification steps, and of course, troubleshooting methods.

  • Switch SVIs: This section covered VLAN routing with Layer 3 Switch SVIs, detailing how to set them up, verify them, and troubleshoot common issues.

  • Layer 3 Switch Routed Ports: Dive into routed interfaces on switches and the complexities of implementing Layer 3 EtherChannels.

Chapter 18: Troubleshooting IPv4 Routing

This section is where I shined comparatively to Blake, since this is something I do on a regular basis as Lead Network Engineer, at work. However, Blake still showed he is learning quickly by answering all of the questions in this section correctly the first time!

  • Ping & Traceroute: These are the two pillars of network troubleshooting. From basics to advanced strategies, we covered how to use them effectively to identify and resolve network issues.

  • Telnet and SSH: We also explored these crucial remote access tools, understanding when and how to use them within the IOS.

Reflections: At the end of our intense study session, Blake and I took a moment to reflect upon our learnings, specifically about the distinctions between dynamic and static routing. Our discussion ventured into the realms of practicality, application, and the underlying philosophies of each approach. Without diving too deep—since our next weekend study is reserved for dynamic routing protocols like OSPF and EIGRP—we both appreciated the theoretical foundation laid this week.

Blake's moment of pride was truly the highlight of our session. Despite never having configured a static route in the CLI before, he aced all the review questions, a testament to both his learning aptitude and the clarity of the material we covered. It's moments like these that reiterate the importance of understanding concepts deeply, not just for exams but for real-world applications. We're both eager and excited for what the next study session holds for us!

Conclusion: In conclusion, our IPv4 Routing deep dive was an enlightening journey, further cementing our knowledge in Cisco routing. Whether you’re new to this world or a seasoned professional looking for a refresher, we hope this post helps in your networking endeavors. Stay tuned for more deep dives as we continue our CCNA journey! Keep your routes optimized and your packets timely! 🚀


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