Appendix B. CLI Command Reference Table

This appendix condenses roughly 300 Cisco IOS CLI commands into a concise, chapter-organized reference aimed at CCNA exam preparation. Each entry names the command, the mode it’s used in, and a short description, with fuller explanations deferred to the chapters where the commands were first introduced or covered in greatest depth. Commands that appear across multiple chapters are generally listed only once, and a handful of demonstration-only commands are included for completeness. The result is a compact, quick-lookup companion that complements the book’s explanations and labs.

The coverage spans the full CCNA blueprint: foundational IOS navigation and configuration management (moving between modes, saving/erasing configs, filtering show output), Layer 2 switching (MAC tables, interface status, speed/duplex), IPv4 interface setup and verification, and routing fundamentals (routing table review and static route variants). It then moves through VLANs and trunks, ROAS/SVIs, DTP/VTP, and spanning tree (STP/RSTP priorities, root/secondary, PortFast, BPDU Guard, path cost methods). Link aggregation via EtherChannel (PAgP/LACP/static) and its verification is included, as are dynamic routing concepts centered on OSPF (process setup, networks, costs/timers, DR/BDR, authentication, operations and database views). First-hop redundancy (HSRP) and a complete IPv6 toolkit (addressing methods, neighbors, interface and routing views, static routes) round out the core networking sequence.

Operational services and security features occupy a large portion: standard and extended ACLs (numbered/named, remarks, resequencing, interface application), neighbor discovery with CDP/LLDP, time services (clock, calendar, NTP), and name services (DNS client/server, host mappings). DHCP functions cover server pools, exclusions, relay, client behavior, conflicts, and bindings, alongside host-side IP tools on Windows, macOS, and Linux. File and image management (file systems, copy via TFTP/FTP, boot settings), secure management (local users, SSH, line configuration, default gateway), SNMP and Syslog (targets, severity, buffering, timestamps, debugging), and NAT (static, dynamic, PAT, statistics) are addressed. QoS and campus access topics include voice VLAN and PoE, password hashing options, Port Security with errdisable recovery, DHCP Snooping and DAI protections, VRFs and VRF-aware commands, wireless-related DHCP options, and data format output for select show commands. Together, these entries provide a fast, practical checklist for labs and troubleshooting that ties features to the exact commands you’ll need on the exam and in the field.

FAQ