Networking media recognition for support staff Which Ethernet physical layer standard most commonly uses RJ-45 modular connectors?

Introduction / Context:
Correctly identifying cabling and connectors is essential for network installation and troubleshooting. RJ-45 connectors are ubiquitous in copper Ethernet deployments across offices, data centers, and home networks.

Given Data / Assumptions:

• RJ-45 refers to the 8P8C modular connector commonly used for twisted-pair Ethernet.
• Legacy coax and fiber standards use distinct connectors and media.
• We are mapping a connector type (RJ-45) to its corresponding media standard.

Concept / Approach:

10Base-T, Fast Ethernet (100Base-TX), and Gigabit Ethernet (1000Base-T) all use UTP/STP twisted-pair cabling terminated by RJ-45 connectors. By contrast, 10Base2 uses BNC connectors on RG-58 coax; 10Base5 uses vampire taps/AUI; and 10Base-FL is fiber with ST/SC/LC connectors.

Step-by-Step Solution:

Verification / Alternative check:

Vendor installation guides and the IEEE 802.3 standard confirm RJ-45 use in 10/100/1000Base-T implementations.

Why Other Options Are Wrong:

10Base2 and 10Base5 are coaxial systems without RJ-45. 10Base-FL is fiber, also not RJ-45.

Common Pitfalls:

Assuming RJ-11 (phone) equals RJ-45; confusing twisted-pair copper with fiber optics; overlooking shielded RJ-45 variants which still indicate copper twisted pair.

Final Answer:

10Base-T (twisted pair).