CCST Network Cables and Connectors 2 — Questions and Answers
Question 1: What is the maximum cable length for Cat 6a Ethernet before signal degradation?
- 55 meters
- 100 meters (Correct answer)
- 150 meters
- 300 meters
Correct answer: 100 meters
Cat 6a supports 100 meters at full 10 Gbps, the same limit as Cat 5e and Cat 6.
The 100m limit (TIA/EIA-568) includes 90m permanent link plus 10m patch cables. Cat 6a achieves full 10G at 100m through improved shielding, unlike Cat 6 which drops to 1G beyond 55m.
Question 2: Which fiber optic cable type uses a larger core and is for shorter distances?
- Single-mode fiber
- Multimode fiber (Correct answer)
- Coaxial cable
- Shielded twisted pair
Correct answer: Multimode fiber
Multimode fiber has a larger core (50/62.5 micrometers) for shorter distances up to ~550m for 10G.
MMF uses cheaper LED/VCSEL sources. OM3 supports 10G at 300m, OM4 at 400m. Single-mode (9um core) supports tens of kilometers. MMF is cost-effective for data centers and building backbones.
Question 3: What is the primary advantage of STP cable over UTP?
- Higher data speeds
- Better protection against electromagnetic interference (EMI) (Correct answer)
- Lower cost
- Easier installation
Correct answer: Better protection against electromagnetic interference (EMI)
STP includes metallic shielding protecting against EMI from electrical equipment and other cables.
STP types include S/FTP (braided shield + foil per pair). Preferred near industrial equipment. Must be properly grounded or the shield acts as an antenna. UTP is sufficient for most offices.
Question 4: Which fiber connector features a push-pull latching mechanism and small form factor?
- RJ-45
- SC (Subscriber Connector)
- LC (Lucent Connector) (Correct answer)
- BNC
Correct answer: LC (Lucent Connector)
LC connectors use push-pull latching with a 1.25mm ferrule, dominant in modern data center installations.
LC is half the size of SC connectors (2.5mm), allowing higher port density. Available in simplex and duplex. SC uses push-pull snap, ST uses bayonet twist-lock, MTP/MPO supports multiple fibers.
Question 5: What distinguishes a crossover cable from a straight-through cable?
- Crossover cables are longer
- Crossover cables swap transmit and receive pairs at one end for connecting similar devices (Correct answer)
- Crossover cables use different connectors
- Crossover cables only work with fiber
Correct answer: Crossover cables swap transmit and receive pairs at one end for connecting similar devices
A crossover cable reverses TX/RX pairs to enable direct communication between like devices.
Straight-through: same pinout both ends. Crossover: T568A one end, T568B the other (swaps pins 1,2 with 3,6). Modern Auto-MDI/MDI-X makes crossover cables largely unnecessary.
Question 6: What is a fiber optic patch panel used for?
- To amplify optical signals
- To provide a centralized termination point for organized connections and easy management (Correct answer)
- To convert fiber to electrical signals
- To split a single fiber into multiple outputs
Correct answer: To provide a centralized termination point for organized connections and easy management
Patch panels provide organized termination where permanent runs connect on one side and patch cables to equipment on the other.
Permanent fiber terminates at the rear via splice trays or connectors. Front presents connectors for patch cables to switches. Also protects splices, manages slack, and provides labeling.
CCST Network Cables and Connectors 2
What is the maximum cable length for Cat 6a Ethernet before signal degradation?