CompTIA Server+ (SK0-005)Server Hardware Installation and ManagementHard
A server administrator is troubleshooting intermittent network connectivity issues on a server connected via a 10GbE SFP+ module. The server periodically drops its network link, and the link light on the switch port flashes erratically. The administrator suspects a cabling issue. Which of the following cables is MOST likely being used and causing this problem?
- ACat6a UTP cable
- BOM3 fiber optic cable
- CDAC (Direct Attach Copper) cable
- DCat5e UTP cable
Show answer & explanationAnswer & explanation
Correct answer: D. Cat5e UTP cable
Cat5e UTP cable is rated for 1Gbps Ethernet and is not suitable for 10GbE connections. Using an incompatible cable like Cat5e for a 10GbE SFP+ connection will lead to intermittent connectivity, link drops, and erratic link lights due to signal integrity issues and excessive errors.
Why the other options are wrong
- A. Cat6a is suitable for 10GbE up to 100 meters and would typically provide stable connectivity if properly terminated.
- B. OM3 fiber optic cable is designed for 10GbE and higher speeds over much longer distances and would provide stable connectivity.
- C. DAC (Direct Attach Copper) cables are specifically designed for short-range 10GbE SFP+ connections and are very reliable.
10GbE Cabling Compatibility
Ensuring the correct type of network cable is used for 10 Gigabit Ethernet (10GbE) connections to maintain signal integrity, achieve specified speeds, and prevent intermittent connectivity issues.
- Cat5e/Cat6 are generally insufficient for 10GbE.
- Cat6a (or higher) is required for 10GbE over twisted pair copper.
- Fiber optic cables (e.g., OM3/OM4) and DAC cables are common for 10GbE.
- Using incompatible cabling leads to performance degradation or link failure.
Memory trick: Wrong cable type makes 10GbE 'Cranky' and 'Unstable'.