Question 142 - 010-151 discussion

The Subscriber Connector (SC), also known as the Standard Connector or Square Connector, is a type of fiber optic connector commonly used in data networking environments. It is frequently associated with multi-mode fiber optic cables, which are typically used for short to medium-range connections within data centers, campus networks, or building interconnections.

Here's a detailed look at each option:

1. Option A - straight-mode:

o This is not a recognized type of fiber optic cable. Fiber optic cables are generally categorized into single-mode and multi-mode, with no standard cable type called 'straight-mode.'

2. Option B - single-mode:

o Single-mode fiber (SMF) is used for long-distance communication, typically involving lasers and narrow core fibers. While SC connectors can technically be used with single-mode fiber, LC (Lucent Connector) connectors are more common in modern single-mode applications due to their compact size and improved performance for high-density connections.

3. Option C - dual-mode:

o 'Dual-mode' is not a correct term in fiber optics. Fiber optic cables are classified into single-mode and multi-mode, but 'dual-mode' is not used as a designation for any standard fiber optic cable type.

4. Option D - multi-mode:

o Correct. Multi-mode fiber (MMF) is commonly used with SC connectors. Multi-mode fiber is designed for shorter distances, and SC connectors are a standard choice for multi-mode fiber installations, especially in older infrastructure. Multi-mode fiber optic cables are commonly used within data centers and enterprise LAN environments for intra-building or intra-campus links where distances are generally shorter than with single-mode fiber.

Cisco Datacenter Networking Device

Reference:

* Cisco Network Switches and Modules: In data center environments, Cisco Nexus and Catalyst switches often support SC connectors with multi-mode fiber for short to medium-distance connections. Many Cisco SFP transceivers for multi-mode fiber are designed for SC or LC connectors.

* Fiber Optic Cabling Standards: SC connectors remain a staple in multi-mode fiber installations, particularly in legacy systems where this connector type was commonly used before the industry shift toward smaller form factor connectors like LC for higher-density applications.

In summary, multi-mode fiber (MMF) is typically used with a Subscriber Connector (SC), as SC connectors are common in multi-mode installations for data centers and enterprise environments.