Description: Link security refers to the measures implemented to protect data transmitted over network links. This includes the use of protocols and technologies that ensure the confidentiality, integrity, and authenticity of information during transit. In a network environment, links can be physical, such as fiber optic cables, or wireless, such as Wi-Fi connections. Link security is essential to prevent attacks such as data interception, spoofing, and other types of threats that can compromise sensitive information. The main features of link security include the use of encryption, device authentication, and the implementation of access controls. In the context of Zero Trust security, link security becomes a critical component, as it is assumed that threats may be present both inside and outside the network, requiring robust protection at every level of communication. In the era of 5G and cloud computing, link security has also become more complex, as connections are faster and data moves across multiple platforms and devices. Therefore, link security not only protects data in transit but is also essential for maintaining trust in modern network infrastructures.