Today's CCENT-level challenge involves the methods that are commonly used to describe and compare modern network infrastructures regarding such things as performance and structure.
Dennis caught our eye creating Visio versions of the best-selling Volume 1 workbook network topology for his fellow students in the IEOC. Thanks again Dennis and enjoy your $50 Gift Certificate for Amazon.com.
The files that Dennis created for his fellow students can be found by clicking here.
Here is his story...
In 1991, I began my official work life as a Customer Service Representative. I repaired all manner of equipment for many well-known small to medium sized retail chains and large retail chains with names ending in "mart". In 1996 I took a position with a small contracting company working at NOAA (National Oceanic and Atmospheric Administration). I worked as a Help desk Engineer for several years. I became Microsoft MSCE certified in 1998. In 1999 I took another position within my company still at NOAA for their Computer Incident Response Team. I had several satisfying years in that position learning all about incident detection, response and remediation.
In our recent Implement Layer 2 Technologies series, we examined Q-in-Q tunneling in great detail. In this discussion, I mentioned a big caution about the Service Provider cloud with 802.1Q trunks in use for switch to switch trunking. This caution involved the use of an untagged native VLAN.
Today's challenge is drawn from the exciting area of CCNA Security. Enjoy. As always, you can find the answer in the comments area a day or two after the date of this post.
Cisco had promised us Christmas 2010 editions of these new exams. Those dates have slipped again.
You will find the answer to today's CVOICE Exam Practice in the comments area of the blog approximately 24 hours after the post. Have fun!
Beginning January 17th, 2011, Cisco will add Layer 2 Switch Troubleshooting to the 2 hour Troubleshooting section of the lab exam. Like the Layer 3 Troubleshooting that you will perform, these switches are emulated devices using Cisco's IOU product - that stands for IOS on UNIX and is a similar approach to the popular Dynamips platforms. Cisco calls the ability to emulate switches on UNIX - L2IOU.
Many times, students believe that they could use a bit of a boost when it comes to solving the very complex and difficult Practice Lab Exams featured in our famous Volume II workbook here at INE. To respond to this, Keith Barker and I came up with an idea for a new INE product unlike anything that had been created before.
We created a fully interactive video guide to lab exam strategy and actual solutions for the first five labs of the workbook. But we did not stop there. We also recorded bonus lessons on topic areas that students always seem to want extra guidance with. Such areas as:
- Am I fast enough when it comes to making configurations?
- What is the best way to master DOC-CD navigation?
- What are appropriate strategies for Troubleshooting?
- What should I do if I am struggling with Redistribution tasks?
Here are some sample lessons from the Interactive Video Companion for Volume II so you can see this remarkable product for yourself. I am also publishing the complete outline here so you can examine that as well.
The Course Outline:
Lab 1 - Dos and Donts - 20 minutes
Lab 1 - Lab Strategy - 30 minutes
Lab 1 - Backup Link - 20 minutes
Lab 1 - Spanning Tree Manipulation - 10 minutes
Lab 1 - Spanning Tree Security - 15 minutes
Lab 1 - Private VLANs - 30 minutes
Lab 1 - Layer 2 Traffic Engineering - 20 minutes
Lab 1 - OSPF Prefix Adv - 10 minutes
One of the most important technical protocols on the planet is Open Shortest Path First (OSPF). This highly tunable and very scalable Interior Gateway Protocol (IGP) was designed as the replacement technology for the very problematic Routing Information Protocol (RIP). As such, it has become the IGP chosen by many corporate enterprises.
OSPF’s design, operation, implementation and maintenance can be extremely complex. The 3-Day INE bootcamp dedicated to this protocol will be the most in-depth coverage in the history of INE videos.
This course will be developed by Brian McGahan, and Petr Lapukhov. It will be delivered online in a Self-Paced format. The course will be available for purchase soon for $295.
Here is a preliminary outline:
Day 1 OSPF Operations
● Dijkstra Algorithm
● Neighbors and Adjacencies
○ OSPF Packet Formats
○ OSPF Authentication
○ Link-State information Flooding
About the Protocol
- The algorithm used for this advanced Distance Vector protocol is the Diffusing Update Algorithm.
- As we discussed at length in this post, the metric is based upon Bandwidth and Delay values.
- For updates, EIGRP uses Update and Query packets that are sent to a multicast address.
- Split horizon and DUAL form the basis of loop prevention for EIGRP.
- EIGRP is a classless routing protocol that is capable of Variable Length Subnet Masking.
- Automatic summarization is on by default, but summarization and filtering can be accomplished anywhere inside the network.
EIGRP forms "neighbor relationships" as a key part of its operation. Hello packets are used to help maintain the relationship. A hold time dictates the assumption that a neighbor is no longer accessible and causes the removal of topology information learned from that neighbor. This hold timer value is reset when any packet is received from the neighbor, not just a Hello packet.