NETWORK SECURITY
It’s best to implement security in a layered approach; if a lower layer has vulnerabilities, there is more risk for the upper layers to be compromised.
Abstract
It’s best to implement security in a layered approach. If an attacker was able to get through one layer, they would still need to bypass multiple other layers to compromise the system. The security measures taken should address multiple layers of the TCP/IP (Transmission Control Protocol/ Internet Protocol) model instead of focusing all efforts on only one layer. For example, it would be better to have a device behind a locked door (physical), install a firewall (internet), and enable port security (data link) rather than only using a cable lock (physical), have the device behind a locked door (physical), and install security cameras (physical). If a lower layer has vulnerabilities, there is more risk for the upper layers to be compromised. For example, if the data link layer is compromised then all the above layers are compromised as well. Networks are only as secure as the weakest link.