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Chapter 58 — Zero Trust, SASE, NAC, and Segmentation

A complete networking lesson based on the course chapter menu.

30 topicsPractical examplesTroubleshooting checksReview Q&A

Estimated reading time0% read

Chapter 58: Zero Trust, SASE, NAC, and Segmentation

This chapter follows the topics shown in the Networking chapter menu. Work through each section in order, then use the review questions to check recall and troubleshooting reasoning.

58.1 Zero Trust

Zero Trust assumes network location alone is not sufficient evidence of trust. Access decisions should verify identity, device state, context, and least-privilege policy.

Scenario: a user reports a problem related to Zero Trust. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Zero Trust without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.2 Traditional Perimeter Security

Traditional Perimeter Security is a network-security concept. A sound design identifies the protected asset, trust boundary, possible abuse path, preventive controls, detection signals, and recovery steps.

Scenario: a user reports a problem related to Traditional Perimeter Security. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Traditional Perimeter Security without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.3 Verify Explicitly

Verify Explicitly is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Verify Explicitly. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Verify Explicitly without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.4 Least Privilege

Least Privilege is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Least Privilege. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Least Privilege without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.5 Microsegmentation

Microsegmentation is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Microsegmentation. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Microsegmentation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.6 Lateral Movement

Lateral Movement is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Lateral Movement. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Lateral Movement without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.7 NAC

Network Access Control evaluates who or what is connecting and can apply admission, role, segmentation, or quarantine decisions.

Scenario: a user reports a problem related to NAC. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain NAC without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.8 Posture Assessment

Posture Assessment is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Posture Assessment. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Posture Assessment without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.9 Quarantine VLAN

A VLAN creates a logical Layer 2 broadcast domain on switching infrastructure. Traffic between VLANs requires a Layer 3 forwarding function.

Example: users in VLAN 20 can communicate with one another through switches, but reaching VLAN 30 requires a Layer 3 gateway. If one trunk omits VLAN 20, only paths crossing that trunk fail.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Quarantine VLAN without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.10 802.1X

802.1X is a port-based network access-control framework involving a supplicant, an authenticator, and an authentication server, commonly using EAP and RADIUS.

Scenario: a user reports a problem related to 802.1X. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain 802.1X without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.11 Supplicant

Supplicant is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Supplicant. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Supplicant without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.12 Authenticator

Authenticator is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Authenticator. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Authenticator without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.13 Authentication Server

Authentication Server is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Authentication Server. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Authentication Server without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.14 RADIUS

RADIUS centralizes authentication, authorization attributes, and accounting for many network-access use cases such as Wi-Fi, VPN, and 802.1X.

Scenario: a user reports a problem related to RADIUS. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain RADIUS without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.15 SASE

SASE combines wide-area connectivity with cloud-delivered security services so access policy can follow users, devices, applications, and locations.

Scenario: a user reports a problem related to SASE. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain SASE without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.16 SSE

SSE is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to SSE. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain SSE without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.17 ZTNA

ZTNA is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to ZTNA. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain ZTNA without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.18 VPN vs ZTNA

A VPN creates a protected logical connection across an untrusted or shared network. The design must define endpoints, authentication, encryption, routing, and failure behavior.

Example: two sites can reach the public internet but cannot pass private traffic through the secure tunnel. Check peer reachability, negotiation state, authentication, encryption proposals, interesting traffic, NAT interaction, routes, and policy.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain VPN vs ZTNA without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.19 Secure Web Gateway

Secure Web Gateway is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Secure Web Gateway. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Secure Web Gateway without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.20 CASB

CASB is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to CASB. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain CASB without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.21 DLP

DLP is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to DLP. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain DLP without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.22 Guest Segmentation

Guest Segmentation is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Guest Segmentation. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Guest Segmentation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.23 IoT Segmentation

IoT Segmentation is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to IoT Segmentation. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain IoT Segmentation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.24 Management Segmentation

Management Segmentation is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Management Segmentation. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Management Segmentation without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.25 Air Gaps

Air Gaps is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Air Gaps. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Air Gaps without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.26 Honeypots

Honeypots is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Honeypots. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Honeypots without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.27 Honeynets

Honeynets is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Honeynets. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Honeynets without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.28 Jump Boxes

Jump Boxes is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Jump Boxes. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Jump Boxes without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.29 Bastion Hosts

Bastion Hosts is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Bastion Hosts. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Bastion Hosts without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

58.30 Authentication vs Authorization

Authentication vs Authorization is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

Scenario: a user reports a problem related to Authentication vs Authorization. Start by writing the exact symptom, affected users, first known failure time, and recent changes. Then choose the smallest safe test that can prove or disprove one cause.

What to check

Confirm the symptom and determine whether the problem affects one host, one segment, one site, or many sites.
Compare actual configuration and measurements with the intended design, baseline, or documentation.
Change one variable at a time, verify the result, and document both the cause and the final fix.

Practice: Practice: explain Authentication vs Authorization without reading the definition. Then draw or describe one network where it is used, name one failure symptom, and list the first two checks you would perform.

Chapter 58 Review Questions

1. What should you remember about Zero Trust?

Answer: Zero Trust assumes network location alone is not sufficient evidence of trust. Access decisions should verify identity, device state, context, and least-privilege policy.

2. What should you remember about Least Privilege?

Answer: Least Privilege is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

3. What should you remember about NAC?

Answer: Network Access Control evaluates who or what is connecting and can apply admission, role, segmentation, or quarantine decisions.

4. What should you remember about Supplicant?

Answer: Supplicant is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

5. What should you remember about RADIUS?

Answer: RADIUS centralizes authentication, authorization attributes, and accounting for many network-access use cases such as Wi-Fi, VPN, and 802.1X.

6. What should you remember about ZTNA?

Answer: ZTNA is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

7. What should you remember about CASB?

Answer: CASB is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

8. What should you remember about Management Segmentation?

Answer: Management Segmentation is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

9. What should you remember about Honeynets?

Answer: Honeynets is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.

10. What should you remember about Authentication vs Authorization?

Answer: Authentication vs Authorization is one of the core topics in Zero Trust, SASE, NAC, and Segmentation. Understand what the term represents, where it operates in the network, what information it uses, and what observable behavior confirms that it is working correctly.