May
10
Edit: Thanks for playing! You can find the official answer and explanation here. Read More
Jan
11
UPDATE: I have received numerous submissions and currently in the process of reviewing them. I'm going to extend the deadline until Wednesday (2012-01-18). At that time all people who submitted working solutions will be awarded 100 tokens! Recently I have been working with a large enterprise customer that is looking to implement a new change control policy. The main goal of the policy is to be able to track who is making changes to devices in the network, and specifically what those changes... Read More
May
14
Hi Everyone! The Challenge People tend to underestimate the important of IGP routing features in modern network. So here is a small challenge scenario for you to practice OSPF traffic engineering. Take a look at the diagram below for information on the topology and link bandwidth. You may assume that every router has a loopback interface for network testing and OSPF router-id selection. There is a large cloud of media servers behind R4, and the users behind R1 need to use full 300Mbps of... Read More
Sep
17
This is the follow up discussion for the post titled, "Have you seen my Router ID?" The underlying issue here was trying to get OSPF to bypass the usual selection process for Router ID. The normal selection order is: Manual router ID configured under ospf process Highest IP address of a loopback in the up state in the respective routing table Highest IP address of an interface of an up state in the respective routing table If there are no up interfaces and you have not manually configured a... Read More
Sep
16
There is more than one possible solution for this challenge. Feel free to post your proposed answer in the comments section. We will try to keep comments hidden from public view, so that the fun isn't spoiled for others. Also, don't feel bad if the answer(s) aren't immediately apparent. A number of very bright people have been puzzled by this scenario.  Answers will be posted on Friday, September 18th. Read More
Aug
07
For the sake of simplicity and enabling a wider audience we decided to post our regular CCIE brainteasers to the blog.  The winner will get a coupon worth 10% off the price of any of our training packages for R&S, Security, Voice or Service Provider or a $250 Amazon.com gift card! Note that the 10% off discount can not be used with any other discount code you may already have. Please post your solution under the comments for this blog entry - the first person to post the correct solution is the... Read More

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