Filters:

  • Technologies

  • Instructors

  • Blog Author Archives: Mark Jacob

    Performance testing and monitoring using free tool NTttcp from Microsoft

    In my classes, whether it is a Cisco class or a CompTIA Network + class, one of the topics always considered is monitoring the network. It turns out that there is a cool tool that is available from Microsoft that allows a network admin to stress test a network connection and monitor the results. Simply … Continue reading Performance testing and monitoring using free tool NTttcp from Microsoft

    What Happens when there are duplicate MAC Addresses. How many MAC Addresses can a Switch learn?

    This post is from our Cisco CCNA Training Course. Instructor Mark Jacob was presenting a Q&A Session in our ICND1 CCNA class and answered a question regarding MAC Addresses and when they get associated to devices. Transcription: What issues arise if there are duplicate MAC addresses? MAC addresses are important. Let’s say I’m a PC … Continue reading What Happens when there are duplicate MAC Addresses. How many MAC Addresses can a Switch learn?

    How MAC Addresses Are Assigned to Devices

    This post is from our Cisco CCNA Training Course. Instructor Mark Jacob was presenting a Q&A Session in our ICND1 CCNA class and answered a question regarding MAC Adresses and when they get associated to devices. Transcription: The OUI is an abbreviation that stands for Organizationally Unique Identifier. “What organization?” you might ask. Let’s take … Continue reading How MAC Addresses Are Assigned to Devices

    Using Cisco’s EEM for path selection in IPv6 networks

    In a previous blog I configured and HSRP pair using an entirely IPv6-oriented topology. I demonstrated the lightning quick failover that can be achieved with carefully crafted timers. However, a careful reader might have noticed that I didn’t consider the path BACK to my source of origin in my topology. So let’s address that today. … Continue reading Using Cisco’s EEM for path selection in IPv6 networks