In this tutorial we will discuss the concept of Ports and how they work with IP addresses. If you have not read our article on IP addresses and need a brush up, you can find the article here. If you ...

Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS queries can also use TCP port 53 if UDP port 53 ...

I have this scenario where the MAC address table in my switch ages out MAC addresses of devices that it hasn't heard from after 5 minutes. I could extend this time, but the scenario also requires that ...