Implementing Cisco Network Security (IINS v3.0) (#194)

You have been tasked with blocking user access to websites that violate company policy, but the sites use dynamic IP addresses. What is the best practice for URL filtering to solve the problem?

Enable URL filtering and use URL categorization to block the websites that violate company policy.
Enable URL filtering and create a blacklist to block the websites that violate company policy.
Enable URL filtering and create a whitelist to block the websites that violate company policy.
Enable URL filtering and use URL categorization to allow only the websites that company policy allows users to access.
Enable URL filtering and create a whitelist to allow only the websites that company policy allows users to access.