CCNP ENCOR 350-401 Troubleshooting Field Manual

The second tier of the series. It assumes you already own the CCNA-level fundamentals and are ready to work at professional depth: not just what broke, but why the protocol behaves that way — and what to do when the textbook fix isn't available to you.

Organized by exam domain, the way ENCOR is studied and tested. Infrastructure runs largest because it's 30% of the exam and where most real failures live. Security, automation, architecture, virtualization, and assurance follow.

Same seven-part fault anatomy as the rest of the series, but at this tier Root cause and Common trap carry more weight — because the mechanism matters as much as the fix.

Inside:

• Chapter 0 — Thinking at CCNP depth
• Chapter 1 — Infrastructure: Routing
• Chapter 2 — Infrastructure: Switching & Overlay
• Chapter 3 — Security
• Chapter 4 — Automation & Programmability
• Chapter 5 — Architecture, Virtualization & Assurance
• Chapter 6 — The instruments at CCNP depth
• Symptom index for random access

Covers SD-Access fabric, LISP, VXLAN, SD-WAN control plane and OMP, MST, GRE, LFA convergence, ISE authentication, NETCONF/RESTCONF, and more.

Instant PDF download. Aligned to blueprint v1.2, effective 2026-03-19.

Written by
Donald C. Heslop Jr. — 2× CCIE — #61970 (Enterprise Infrastructure & Security)

Delivery & requirements
Delivered as a DRM-protected, watermarked PDF via the Locklizard Safeguard Viewer. After purchase you'll install the free viewer, register your license file, and open the guide. Your license binds to the first device you open it on; additional device licenses are available separately.

• Windows 10+, macOS 11.5+, iOS/iPadOS 15.6+, Android 6.0+
• Admin rights required for install; activation won't complete over VPN or RDP
• No Linux build available

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