VPN Architecture, IPSec, IKE, Jump Servers

Cyber Log — October 29, 2025

Focus Areas: VPN Architecture, IPSec, IKE, Jump Servers

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Objectives

Strengthen understanding of secure network connectivity through VPN and jump server analysis.

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Activities & Labs

• Studied IPSec sequence: IKE negotiation → Security Associations → Tunnel establishment.
• Distinguished between tunnel mode and transport mode.
• Reviewed jump server purpose in network segmentation and administrative access control.
• Compared Unified Threat Management (UTM) devices vs dedicated jump hosts.

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Knowledge & Concept Highlights

• IKE establishes key exchange and parameters for IPSec.
• Security Associations define cryptographic context for the session.
• Jump servers isolate privileged access and reduce lateral movement risk.

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Reflections & Takeaways

VPN and remote administration concepts consolidated.
Clear grasp achieved of how identity, encryption, and segmentation combine to create layered defense.

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End of Log — October 29, 2025