Spanning-tree protocol (STP)
Stops broadcast storms in your network. STP looks for redundant connections in your network and blocks them until they really are needed. Why we need STP? Switches send broadcast traffic everywhere! If clients send a…
Why VLANs Matter More Than People Realize
VLANs can be used to f.e. group employees together. To make sure no other employee can enter the network of this department. That’s what VLANs all about Why We Need VLANS What are VLANs? A…
Re-addressing Castle Rysen Coffee
Now that we understand subnetting., it’s time to take a look at our RFP and do the ip re-addressing for castle rsen coffee. So in our example they talk about, that in the central office…
What is Subnetting?
Subnetting is split one big network into multiple little ones. You can do this based on network requirements (we need 130 networks) or you can do this on host requirementes (we need have 50 hosts…
NAT – network address translation
How NAT Works The networks under RFC1918 which are considered private do NOT work on the internet. Well, they could theoretically but if you get internet from an ISP then those ISP have a ACL…
Configuring Router Interfaces
Understanding Basic Interface Counters What we see in the picture above: Under the total Packets input Packets output Understanding Interface Speed 1 byte = 1 character -> e 1 bit = a 0 or a…
Configuring Switch Interfaces
It is a plus to always use global templates for ports, so every switch you touch has your own style and navigation and troubleshooting gets easier because you are familiar with your environment. There are…
Defining Networks with Subnet Masks
Subnetmask is the definer of networks. What part represents the network itself, and what part of the ip address represents the host in the network. There are 3 classes The first octet defines the class…
Review, Why Routers Exist
Every interface on a router is a network. A router stops broadcasts. If those would get out to the internet, the internet would be a flood. Inside of these routers is a routing table. Which…
Why do we need ip addresses?
If you are in the network 192.168.1.0/24 and try to ping 192.168.1.50 the client sends an ARP request. But if we try to ping 192.168.3.10 the client gets so smart, that it is not trying…