For example, if you want to host your own web server and limit it to only web traffic, you would typically have two firewall rules that look something like this: Source In the simplest version of a firewall, rules can be created which allow a specific port and/or protocol for traffic from one device (or a group of devices) to a device or group of devices. The firewall can be thought of as the guardian or gatekeeper.Ī set of rules defines what types of network traffic will be allowed through the firewall and what will be blocked. Firewallsįirewalls are security devices at the edge of the network. If you have ever manually configured your IP address on a workstation, the default gateway value that you keyed in was the IP address of your router. Routing allows devices separated on different LANs to talk to each other by determining the next “hop” that will allow the network packet to eventually get to its destination.
Switches allow two devices on the network to talk to each other without having to forward that traffic to all devices on the network. A switch contains several ports that physically connect to other network devices, including:Įarly networks used bridges, in which each device “saw” the traffic of all other devices on the network. (including all of the information technology related equipment) used to develop, test, deliver, monitor, control, or support IT services.Īssociated people, processes, and documentation are not part of IT Infrastructure.Ī network switch is the device that provides connectivity between network devices on a Local Area Network (LAN). The term IT infrastructure is defined in ITIL as a combined set of hardware, software, networks, facilities, etc. Thinking of infrastructure in this manner enables effective conversations with those who are less familiar with the various components. I like to think of infrastructure as everything from wall jack to wall jack.
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