Network auditing is the collective measures done to analyze, study and gather data on a network with the purpose of ascertaining its health in accordance with the network/organization requirements. Network auditing primarily provides insight into how effective network control and practices are, i.e. its compliance to internal and external network policies and regulations.
Network security audits are important because they help you identify your biggest security risks so you can make changes that will protect your company from those risks. That’s pretty common knowledge. However, a network security audit is the only solution identify network related security issues.