Sub-category:   Cisco » Routing

This post represents the solution and explanation for quiz-24. It shows that using always option with default-information originate may have an undesired effect !...

This post represents the solution and explanation for quiz-22. It presents how fragmented traffic is handled differently by a simple access list. It is a long read about fragmentation, Path MTU Discovery, MSS and other stuff...

This post represents the solution and explanation for quiz-21. It is a very long post describing Pre-bestpath community, Point of Insertion, offset list and other networking hacks employed to tackle a less common problem. Make yourself a coffee and start reading...

This post represents the solution and explanation for quiz-16. Advertising inactive BGP routes can, sometimes, depend on other conditions. This article presents some scenarios with inactive BGP prefixes, suppress-inactive and RIB-NH Matches.

This article discusses the solutions for quiz 15. Yes, I know, I know... it's about RIP ! But you need to be ready for anything when facing the challenges of a CCIE exam. Read along to review some things about auto-summarization (which is "on" by default).

This article discusses the solutions for quiz 14 and it describes some scenarios to help understand why redistributing iBGP into IGP (OSPF in this case) is dangerous.

Here I come with the solution for quiz-12, that I consider to be one of the most difficult quizes published on this blog, until now. Forwarding Address (FA) is not quite a common nor easy to understand topic. Read to find out more.

This post represents the solution and explanation for quiz-11. A very important topic when configuring Network Address Translation (NAT) is the order of operation. Who is performed first: NAT or Routing ?

This post represents the solution and explanation for quiz-10. It describes the functionality of the Down Bit in preventing routing loops in your network.

This post represents the solution and explanation for quiz-8. Adding a new link into the MPLS cloud created an outage for the customer. Read to understand how LDP-IGP Synchronization might help.

This post represents the solution and explanation for quiz-6. Running dynamic routing protocols over tunnels can result in recursive problems. Read more to understand the problem and some solutions.

This post represents the solution and explanation for quiz-5.
It explains one of the Loop Prevention mechanisms in OSPF by using the P-bit in the LSA.

This post represents the solution and explanation for quiz-4. The quiz shows that, although the BGP speakers can reach each other, they do not establish an eBGP session. Read more to understand the problem.

This post represents the solution and explanation for quiz-3.
NAT on Cisco IOS can be pretty frustrating sometimes and it may take time and practice to master it.