CCNA: networking and production troubleshooting

Objectives and progression

Seven original lessons teach interpretation of addresses, tables, states, and policies through production-support examples. Includes 35 explained questions, five fictional banking cases, and an internal 26-decision assessment. Introductory mapping to six CCNA v1.1 domains without exhaustive coverage or an executable lab. Version v1.1 can be taken through 2027-02-02; v2.0 starts on 2027-02-03 and will need its own mapping. Commands and features depend on the platform and version identified in references.

Audience: Networking, APS, and technical project professionals preparing for CCNA.

Prerequisites: Basic IP, terminal, and client-server architecture knowledge; separate networking lab practice.

240 estimated study minutes

• Calculate prefixes and distinguish transport from application evidence.
• Diagnose VLANs, trunks, redundancy, and route selection.
• Relate DHCP, NAT, QoS, and security policies to concrete symptoms.
• Control identity, API contracts, and recommendation validation.

Modules

1. Addressing, transport, and evidence
2. IPv6, MAC learning, and VRFs
3. VLANs, trunks, and access protection
4. Routing, OSPF, and redundant gateways
5. DHCP, NAT, logs, and quality of service
6. Policy, identity, and secure management
7. APIs, data, and AI-assisted decisions

Continue learning

Networking

• DNS
• SSH
• Linux Administration
• Production Support L3

References and version

200-301 CCNA v1.1

• CCNA exam details · 2026-09-29
• CCNA exam topics · 2026-09-29
• CCNA refresh dates · 2026-09-29
• Future CCNA exam topics · 2026-09-29
• CIDR addressing and aggregation · 2026-09-29
• IPv4 /31 point-to-point addressing · 2026-09-29
• IPv6 addressing architecture · 2026-09-29
• IPv6 scoped addresses · 2026-09-29
• TCP specification · 2026-09-29
• OSPF version 2 · 2026-09-29
• DHCP · 2026-09-29
• Traditional NAT · 2026-09-29
• JSON data interchange · 2026-09-29
• HTTP semantics · 2026-09-29
• SSH architecture · 2026-09-29
• Syslog protocol · 2026-09-29
• TACACS+ protocol · 2026-09-29
• Administrative distance and route selection · 2026-09-29
• VLAN trunks · 2026-09-29
• Optional spanning tree features · 2026-09-29
• EtherChannels · 2026-09-29
• Spanning tree protocol · 2026-09-29
• CRC error diagnosis · 2026-09-29
• MAC table administration · 2026-09-29
• Virtual routing and forwarding · 2026-09-29
• SSID data model · 2026-09-29
• HSRP preempt and tracking · 2026-09-29
• Policing and shaping · 2026-09-29
• IP ACL overview · 2026-09-29
• Dynamic ARP inspection · 2026-09-29
• Catalyst Center AI Assistant · 2026-09-29