Device hardening and Layer 2 security controls

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Apply device-hardening practices such as changing default credentials, enforcing strong password policies, restricting administrative access, disabling unused services and interfaces and keeping device software current.
Explain secure management settings for network devices, including SSH, HTTPS, SNMP security options, management ACLs and dedicated management-plane protections.

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Evaluate switchport and VLAN hardening measures such as disabling unused ports, moving unused ports to an unused VLAN, controlling trunking and preventing unauthorized VLAN participation.

Explain endpoint- and device-admission controls at the access layer, including 802.1X-based port access and posture-oriented access decisions where applicable.

Recommend hardening and Layer 2 protections based on symptoms, policy requirements and risk presented in branch, campus and data-center switching scenarios.

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