This chapter covers access control and threat intelligence, two cybersecurity essentials. It begins with an overview of network access control methods that govern user access and enforce security regulations. Students study DAC, MAC, RBAC, ABAC, and zero trust to learn how authentication, authorization, and accounting (AAA) secure enterprise systems. AAA implementation—including local and centralized authentication and RADIUS and TACACS+—is prioritized. Students learn about threat intelligence from SANS, MITRE, and Cisco Talos throughout the chapter. Learners learn about FireEye, AIS, STIX, and TAXII, which recognize, share, and respond to developing cyber threats. The chapter shows how proactive access management and continuous threat monitoring secure digital environments by merging theory and practice. Students learn to assess risk, implement access controls, and use threat feeds to detect and prevent real-time assaults. This dual approach helps future professionals create layered and intelligent cyber defense strategies.