CCNA 200-301 v1.1 reference — Network Fundamentals
IPv4 addressing
IPv4 address and prefix structure, public versus private ranges, address classes and the role of NAT for RFC 1918 space.
Objective 1.6Objective 1.7v1.1 exam target
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RFC 1918 private ranges
| Range | CIDR | Addresses |
|---|---|---|
| 10.0.0.0 – 10.255.255.255 | 10.0.0.0/8 | ~16.7 million |
| 172.16.0.0 – 172.31.255.255 | 172.16.0.0/12 | ~1 million |
| 192.168.0.0 – 192.168.255.255 | 192.168.0.0/16 | 65,536 |
Private addresses are not routed on the public internet; NAT translates them at the edge.
Special IPv4 ranges
| Range | Purpose |
|---|---|
| 127.0.0.0/8 | Loopback — traffic never leaves the host |
| 169.254.0.0/16 | Link-local (APIPA) — self-assigned when DHCP fails |
| 224.0.0.0/4 | Multicast groups |
| 255.255.255.255 | Limited broadcast (this subnet only) |
| 0.0.0.0 | Unspecified source / default route notation |
Historical address classes (context)
| Class | First octet | Default mask | Notes |
|---|---|---|---|
| A | 1–126 | /8 | 127.x is reserved for loopback |
| B | 128–191 | /16 | |
| C | 192–223 | /24 | |
| D | 224–239 | — | Multicast, not host addresses |
| E | 240–255 | — | Reserved/experimental |
Classes are obsolete for allocation (CIDR replaced them) but still referenced in documentation and exam questions.
Related resources
Sources
- Cisco CCNA 200-301 v1.1 Exam Topics (official PDF) — reviewed 2026-11-02
- RFC 1918 — Address Allocation for Private Internets — reviewed 2026-11-02
- Cisco — IP Addressing Services Command Reference — reviewed 2026-11-02
Targets CCNA 200-301 v1.1 objectives. Supplemental blocks are labeled beyond exam scope.