Part of what makes TCP so great is that it guarantees reliable transport for data transmissions. It does this by verifying that all of the data was received before more data is sent. This verification is accomplished by the receiver sending acknowledgments (ACKs) to the sender. In the event of a timeout, the sender will…
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Just remember… there are 8 bits in a byte, 8 kilobits in a kilobyte, 8 megabits in a megabyte, etc. Now go share this information with someone you love!
There are many “styles” of VPNs that exist, but the fundamentals of how everything works is basically the same. A VPN, or Virtual Private Network will essentially create an overlay network on top of an existing network fabric. Sometimes the existing network is the internet, but that’s not always the case, it could also be…
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If fragmentation occurs at the physical interface instead of the GRE tunnel interface, then we could end up with fragmented GRE packets. These fragments would need to be dealt with by the router on the other end of the tunnel; this could degrade network performance. By modifying the IP MTU on the GRE tunnel itself, fragmentation…
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What happens when you connect two switches together with “spanning-tree portfast” interfaces? I’ll give you a hint… Interfaces configured as “portfast”, or “switchport host” still send BPDUs… Watch the video below to learn more.
Implementing a route to NULL0 is a well-known method for dropping traffic headed somewhere you don’t want it to go, or… a location that doesn’t exist!
A LAN is simply a collection of devices constrained within a localized area. More specifically, in the context of 802.3 (Ethernet), the term LAN would be used to define any network using Ethernet for communication. We can also include wireless (802.11) into this as well. Ethernet switches play the biggest role in today’s LANs, and…
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Understanding the concept of mutual route redistribution and the potential for routing loops can easily throw your mind into a loop! The goal of this video is to hopefully make this topic a bit easier to digest.
This guide demonstrates how to configure a client to site IKEv2/IPSec tunnel on a Cisco ISR router.
In this video I will walk you through configuring a very simple VPLS lab using 3 provider routers and 3 customer edge routers.
