Data Link The relationship between the ( Data Link) layer and security is very important because the Data Link layer regulates and controls data transmission on the network. Below I explain this relationship in more detail:
Access Control: The Data Link layer regulates the communication of networked devices. This layer recognizes devices using MAC (Media Access Control) addresses to prevent unauthorized access. MAC address filtering and similar security measures can be implemented by the Data Link layer. This improves network security by allowing only authorized devices to access the network.
Error Control: The Data Link layer performs the error check to ensure that the transmitted data is received accurately and reliably. Detecting errors in data frames contributes to maintaining data integrity and security of data transmission.
Encryption: The Data Link layer is a place that can be used to encrypt and decrypt data. Encryption of data, especially on wireless networks or insecure networks, can be done at the level of the Data Link layer. This ensures the privacy and security of data transmission.
Secure Protocols: Data Link layer protocols can have versions developed to increase security. For example, security protocols such as WPA2 or WPA3 are used in Wi-Fi networks. These protocols ensure the encryption and security of communication between devices connected to the network.
Authentication: Some Data Link layer protocols may include devices’ authentication processes. This improves security by authenticating devices connected to the network.
Network Isolation: The Data Link layer can isolate devices within the network. For example, virtual LANs can isolate different network segments from each other and increase their security levels by creating (VLANs ).
As a result, the Data Link layer can be used to implement a set of measures for network security and to make data transmission safer and more reliable. This layer should be considered as part of network security and can increase the security of the network when used with the right security measures.