Apr
15
Don't Forget to tune into my Load-Balancing with PVST+ webinar tomorrow morning! When it comes to the Spanning-Tree Protocol, many people understand the basic concepts such as Root Bridge election, Root Ports and Designated Ports…and that’s it. But what happens when you have several VLANs, all of which have converged to the same Spanning-Tree topology? This can easily cause link congestion, packet latency and even dropped packets. Do you have the knowledge and skillset to adjust Spanning-Tree... Read More
Apr
02
Join me on April 16th for my next FREE live webinar - Load Balancing With PVST+ When it comes to the Spanning-Tree Protocol, many people understand the basic concepts such as Root Bridge election, Root Ports and Designated Ports…and that’s it. But what happens when you have several VLANs, all of which have converged to the same Spanning-Tree topology? This can easily cause link congestion, packet latency and even dropped packets. Do you have the knowledge and skillset to adjust Spanning-Tree... Read More
Mar
19
My Network Monitoring with SPAN & RSPAN webinar airs in one week! This webinar will introduce you to SPAN and RSPAN, two features that provide the ability to transparently monitor (by copying) select ingress traffic, while allowing the switch to continue to forward the original traffic as normal.  You can start by reading my blog post on the topic here. For those of you that would like to learn more and have some of your questions answered, you can register for my webinar next Tuesday, March... Read More
Mar
06
OSPF Route Poisoning Techniques When first learning about IGP Routing Protocols, much time is spent learning about how routers form neighborships (if they do at all) and how new routing updates are exchanged. Little, if any, time is spent describing the process by which routers inform each other of prefixes that have gone down, and the mechanics involved in doing so. This blog post seeks to rectify that situation with regards to the OSPFv2 Routing Protocol. Every standardized routing protocol... Read More
Feb
22
In the world of network monitoring, SPAN and RSPAN are useful features that can be implemented on Cisco switches. These two features provide the ability to transparently monitor (by copying) select ingress traffic, while allowing the switch to continue to forward the original traffic as normal. Both SPAN and RSPAN require the selection of one-or-more SPAN Source ports (typically physical interfaces, but entire VLANs can also be selected) as well as one-or-more SPAN Destination ports (where... Read More
Jan
23
For those who begin their studies of computer networking, a common question is the one posed above in the title. What is the reason behind why a device (connected to an Ethernet network) needs to have two identifiers? Read More
Dec
12
Head over to your All Access Pass members account and login to watch Public Key Infrastructure (PKI) & Digital Certificates.     About The Course: This course will explain the components of the Public Key Infrastructure (PKI) and introduce you to several of its critical elements such as; Asymmetric Key Encryption, Hash Algorithms, Trusted Root Certificate Authorities, how to view Digital Certificates and understand the fields within them, Certificate Revocation methods, and much, much more. Read More
Aug
17
This course covers the basics of implementing inter-VLAN routing by explaining the theory behind two common methodologies, as well as their implementation on Cisco routers and switches. By the end of this course students will be able to explain the differences between "Router-On-A-Stick" and "Switched Virtual Interfaces," as well as how to implement inter-VLAN routing using either of these techniques. Read More
Jul
31
Apr
28
Hello everyone! I recently received an email from a learner who is studying for his CCNA Routing-and-Switching Certification and he had a few excellent questions about the OSI model and how, exactly data moves from one-layer to the next. I figured my response might prove valuable to others studying for their CCNA so...here it is! ..... Read More

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