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Network administration is crucial in IT as it involves managing and maintaining computer networks, which are essential for businesses to function efficiently. It ensures secure data transmission, maximizes network performance, and resolves any network-related issues.

Designing an effective network architecture involves factors like understanding business requirements, determining network scalability, choosing appropriate hardware and software components, implementing security measures, and considering future growth and technological advancements.

Network monitoring and troubleshooting are vital for identifying and resolving network issues promptly. Best practices include using network monitoring tools, monitoring network performance metrics, analyzing logs, conducting regular security audits, implementing redundancy, and documenting network configurations.

Ensuring network security requires implementing multiple layers of defense. This includes using firewalls, antivirus and anti-malware software, strong password policies, access controls, encryption, regular security updates, employee training on cybersecurity, and conducting vulnerability assessments and penetration testing.

Network administrators are responsible for managing and maintaining the organization's computer networks. Their responsibilities include designing and configuring networks, monitoring network performance, troubleshooting network issues, ensuring network security, managing user access and permissions, and staying up-to-date with the latest networking technologies and protocols.

Optimizing network performance involves various strategies such as monitoring bandwidth usage, identifying network bottlenecks, optimizing network protocols, implementing Quality of Service (QoS) policies, managing network traffic, utilizing caching and load balancing techniques, and regularly updating network infrastructure.