May 24, 2018

Tag Archives: CCNA

OSPFv3 Virtual Link Configuration

In this article, you find many use cases for OSPF virtual links when and how they are used. We will dive into OSPFv3 for this example. All areas in an OSPF autonomous system must be physically connected to the backbone area (area 0). In some cases where this physical connection is not possible, Virtual-Links are […]

Demultiplexing And How It Works

In this article I will explain demultiplexing and how it works by walking through a .pcap file taken from the lab in the screenshot below. We will focus on the data flowing from PC1 and SW1 to R1’s ingress port. Demultiplexing (DEMUX) is the method in which the TCP/IP stack uses to determine if datagrams have […]

January 2017 Study Schedule

Happy new year everyone, I hope you have had a fantastic end to the year and you are looking forward to all the possibilities 2017 has to bring. I have kicked off my year by devising a training schedule for January. The reason I have done this is so that I have some form of structure […]

2017 Certification Plan

This year has been crazy! I have graduated University with a 1st class honours, attained the CCNA Routing & Switching certification and been offered a job with Cisco Systems. All that hasn’t been easy but I’ve managed to achieve all that with hard work, dedication and by having a passion for networking and security. So […]

Packet Tracer Troubleshooting Activity : 102

Hello everyone, I thought it would be a great idea to produce and deliver another troubleshooting exercise for those keen net-workers out there. This is another CCNA level network and I have tried to mix things up a little to make you think a little more about the potential problems. Network overview All devices were […]

Packet Tracer Troubleshooting Activity :101

This activity has been created by myself to test those studying for the CCNA exam. Due to the requests I keep getting on YouTube to keep updating the link, I have decided to put together this post. The network topology below has two errors and it is your job to identify the errors and fix the […]

Investigating HSRP

Hot Standby Router Protocol (HSRP) is a Cisco propitiatory router protocol that provides first-hop redundancy for IP hosts on a LAN. It enables a set of router interfaces once configured to present a single virtual default gateway for IP hosts on the LAN. HSRP has two modes: ACTIVE – Physical router acts as the main […]

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