300-360 Question #238: Real Exam Question with Answer & Explanation

The correct answer is A: Cat5e. Cisco multi-Gigabit Ethernet based on the IEEE 802.3bz NBASE-T standard supports 2.5 Gbps operation over Cat5e cabling, making Cat5e the minimum cable category required.

Question

You are using the Cisco Aironet 3800 Series access points connected to Cisco Catalyst 3850 switches and you want to use the multi-Gigabit Ethernet feature. Which cable category is the minimum requirement for the wired infrastructure to have support of this feature?

Options

ACat5e
BCat6
CCat6e
DCat5

Explanation

Cisco multi-Gigabit Ethernet based on the IEEE 802.3bz NBASE-T standard supports 2.5 Gbps operation over Cat5e cabling, making Cat5e the minimum cable category required.

Common mistakes.

B. Cat6 exceeds the minimum requirement for multi-Gigabit Ethernet; Cat5e is sufficient for 2.5 Gbps per the 802.3bz standard.
C. 'Cat6e' is not a recognized or standardized cable category under TIA/EIA or ISO/IEC specifications, making this an invalid choice.
D. Cat5 (without the 'e' enhancement) is rated for 100 Mbps Fast Ethernet at 100 meters and lacks the bandwidth and reduced crosstalk characteristics needed to support multi-Gigabit speeds.

Concept tested. Multi-Gigabit Ethernet minimum cabling requirements

Reference. https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/white-paper-c11-737607.html

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