Console connection cabling: Which RJ-45 UTP cable type is normally used to connect a PC’s serial COM port (via an RJ-45 console adapter) to a router or switch console port for out-of-band management?

Introduction / Context:
Out-of-band console access to Cisco devices typically uses an RJ-45 console port and a special pinout cable. Choosing the correct cable avoids frustrating connection failures when performing initial configuration or recovery.

Given Data / Assumptions:

• PC serial COM port is adapted to RJ-45 for console access.
• Device offers an RJ-45 console port.
• Standard Cisco cabling conventions apply.

Concept / Approach:

A rollover (rolled) cable reverses pin 1 to pin 8, 2 to 7, etc. It is distinct from a straight-through (patch) or crossover (switch-to-switch) Ethernet cable. For console sessions, the rolled cable plus a terminal emulator (and often a USB-to-serial adapter) provides management access independent of network state.

Step-by-Step Solution:

Verification / Alternative check:

Successful terminal session shows ROMMON/IOS prompts. Using a straight-through/crossover typically fails to produce output due to wrong pin mapping.

Why Other Options Are Wrong:

Straight-through and crossover cables are for Ethernet data links, not console serial connections.

“Crossover with a CSU/DSU” is unrelated to local console access.

Common Pitfalls:

Confusing Ethernet link types with console wiring; forgetting that the console is not IP-based and won’t bring up link LEDs like Ethernet ports.

Final Answer:

Rolled