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# Network Security and Common Network Threats Network security refers to the collection of policies, practices, technologies, and procedures used to protect computer networks, connected devices, data, applications, and communication resources from unauthorized access, misuse, disruption, modification, or destruction. In network programming and administration, security is an essential responsibility because networks provide the infrastructure through which users, applications, servers, and devices communicate. A secure network aims to maintain confidentiality, integrity, availability, authentication, and accountability of information and services. Network security protects data while it is being transmitted as well as while it is stored or processed on network-connected systems. Network administrators implement security controls such as access control, firewalls, intrusion detection systems, secure protocols, encryption, authentication mechanisms, VPNs, and regular software updates. Effective security also requires continuous monitoring, vulnerability assessment, backup procedures, and user awareness because threats constantly evolve. One of the common threats to a network is a virus. A virus is a malicious program that attaches itself to legitimate files or programs and spreads when the infected file is executed or shared. Viruses may corrupt files, delete data, modify system configurations, consume resources, or provide unauthorized access to attackers. For example, an infected executable file downloaded from an untrusted source may spread to _____ ___ __________ _____ _______.
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