300-360 · Question #238
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…
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
How the community answered
(35 responses)- A91% (32)
- B6% (2)
- C3% (1)
Why each option
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.
The IEEE 802.3bz standard defines 2.5GBASE-T and 5GBASE-T operation over existing Cat5e and Cat6 cabling respectively at up to 100 meters, and Cisco implemented this on the Catalyst 3850 and Aironet 3800 specifically to avoid infrastructure cable replacement. Cat5e is therefore the minimum requirement, allowing organizations to support the higher throughput of 802.11ac Wave 2 APs without rewiring their buildings.
Cat6 exceeds the minimum requirement for multi-Gigabit Ethernet; Cat5e is sufficient for 2.5 Gbps per the 802.3bz standard.
'Cat6e' is not a recognized or standardized cable category under TIA/EIA or ISO/IEC specifications, making this an invalid choice.
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
Source: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/white-paper-c11-737607.html
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