← all cheat sheets
PRACTICE PLAN
Firewall / Security Engineer
Focused Refresher Track
13 sheets — firewall internals, VPN, WAN path, application-layer protocols, role interview prep, and a mock interview drill for a perimeter engineer.
Full Target-Role Track
Network Engineer
Firewall / Security Engineer
SOC / Security Ops Analyst
DevOps Engineer
0 of 0 complete
01
Firewall Fundamentals
2 sheets
1. Firewall — Concepts & Interview Q&A
Definitional Q&A, NAT, VPN, policies, vendor notes.
OPEN →
2. Inside the Firewall
Session lookup, fast path vs. slow path, security profiles.
OPEN →
02
Core Connectivity Mechanisms
2 sheets
3. PC to Internet
Where NAT and firewall policy actually sit in the path.
OPEN →
4. URL to Page Load
DNS, TCP, TLS, HTTP — what a firewall/proxy actually inspects.
OPEN →
03
VPN & NAT
1 sheet
5. Site-to-Site VPN
IKE Phase 1/2, SAs, and ESP passing real data.
OPEN →
04
WAN & Branch Path
2 sheets
6. Branch to Public Website
SD-WAN path selection, centralized breakout, NAT at HQ.
OPEN →
7. Metro Fiber Circuit Down
Gray failures, BFD, automatic reroute.
OPEN →
05
DNS / TLS / TCP
3 sheets
8. DNS to First Encrypted Byte
Resolver hierarchy and TLS handshake in depth.
OPEN →
9. TCP Three-Way Handshake
SYN floods and the half-open state — squarely security-relevant.
OPEN →
10. Split DNS
Why internal and external resolution diverge.
OPEN →
06
Interview Prep
3 sheets
11. Network & Firewall Ownership — Interview Prep
Tie the mechanisms above to the actual role you're interviewing for.
OPEN →
12. Firewall / Security Engineer — Role Interview Prep
Policy and incident-response scenarios, STAR behavioral prep, red flags.
OPEN →
13. Mock Interview Drill
Random-draw practice run against the question bank above — Rapid Fire or Full Interview mode.
OPEN →