Sources
Priority: P0 official exam authority → P1 government/regulator → P2 professional organisation → P3 academic → P4 reputable secondary. Competitor prep sites are never used as a source of truth.
| Source | Publisher | Type | Retrieved | Verified | Re-check every | Status |
|---|---|---|---|---|---|---|
| CCNA Exam v1.1 (200-301) Exam Topics Six domains with percentage weights (20/20/25/10/15/10); 120-minute exam. | Cisco Systems | primary | 2026-09-21 | 2026-09-21 | 60d | active |
| CCNA exam (200-301) overview page — duration, price, registration 120 minutes; US$300 or Cisco Learning Credits (as shown 2026-09-21). | Cisco Systems | primary | 2026-09-21 | 2026-09-21 | 30d | active |
| RFC 1918 — Address Allocation for Private Internets | IETF | government | 2026-09-21 | 2026-09-21 | 365d | active |
| RFC 4632 — Classless Inter-domain Routing (CIDR) | IETF | government | 2026-09-21 | 2026-09-21 | 365d | active |
| RFC 3021 — Using 31-Bit Prefixes on IPv4 Point-to-Point Links | IETF | government | 2026-09-21 | 2026-09-21 | 365d | active |