Category: Networking

How Upload Bandwidth/Latency Can Affect Download Speed

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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Bits vs Bytes

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!

How VPN Tunneling Works | Generic Example | Remote User VPN

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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Why Change the IP MTU on GRE Interfaces?

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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Spanning Tree Protocol – Portfast Interface Behavior

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.

Route Summarization and the Route to Null0

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!

The Basics of a LAN and How Ethernet Switching Works

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‚Äôs LANs, and…
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Routing Loops | Mutual Redistribution | Route Tagging | Cisco

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.

IKEv2/IPSec Client to Site VPN Configuration | Cisco IOS | Cisco AnyConnect

This guide demonstrates how to configure a client to site IKEv2/IPSec tunnel on a Cisco ISR router.

Simple VPLS Configuration | LDP Signaling | Cisco | Service Provider

In this video I will walk you through configuring a very simple VPLS lab using 3 provider routers and 3 customer edge routers.