Comprehensive interface status review: Which Cisco IOS command displays the configurable parameters and runtime statistics for all router interfaces (physical and logical)?

Introduction / Context:
Troubleshooting connectivity requires visibility into interface health and configuration. Cisco IOS provides several show commands, but only one gives a full, consolidated report of operational statistics, errors, encapsulation, bandwidth, duplex, and IP details for all interfaces.

Given Data / Assumptions:

• You need both configuration-related information and live counters in a single output.
• Multiple interface types may exist (Ethernet, Serial, Loopback, VLAN SVI).
• The goal is to examine status, not merely the saved or current config text.

Concept / Approach:

The command show interfaces prints per-interface blocks showing line protocol state, hardware address, MTU, BW, delay, reliability, load, encapsulation, input/output rate, errors, drops, and IP details. It is the broadest, statistics-rich view across all interfaces.

Step-by-Step Solution:

Verification / Alternative check:

Compare with show running-config: it shows config lines but not live counters and errors. show interfaces provides packet statistics and error counters that confirm physical or data-link problems.

Why Other Options Are Wrong:

show running-config and show startup-config display configuration text only.

show versions is not a standard command; the common one is show version for software/hardware inventory, not per-interface stats.

Common Pitfalls:

Relying solely on show ip interface brief and missing duplex mismatches or CRC errors; overlooking interface resets and input errors that indicate cabling or speed/duplex issues.

Final Answer:

show interfaces