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HPE7-A03 Exam - Topic 3 Question 47 Discussion
Topic #: 3
A global cruise line company needs to refresh its current fleet. They will refresh the 'insides' of the ship to be cost-effective and increase their sustainability. They will replace the complete WLAN/LAN hardware of the ship. In this refresh, the company will not refresh its current security requirements. The CIO also wants to limit the number of unused ports in the switches. Future expansion will always mean a refresh of hardware. They start with the smallest ship with a maximum of 800 guests.
Each ship has a LAN infrastructure consisting of two core switches, up to 10 redundant distribution switches, and up to 500 access switches (400 cabins, 100 technical rooms). The core switches are located in the MDF of the ship and the distribution switches are located in the IDFs of the ship. Each cabin and technical room gets one single access switch.
The cabling structure of the ship will not be refreshed. Each IDF is connected to the MDF by SMF, of which two pairs are available for the interconnect between the core and distribution. The length of SM fiber between MDF and IDF is less than 300 meters (980 ft) and the type used is OS1. Each cabin is connected by a single OM2 pair to the IDF, the maximum length is 60 meters (200 ft). Each technical room is connected by a single OM2 pair to the IDF, with lengths between 100 and 150 meters (320 and 500 ft).
For each cabin/technical room the customer is looking to replace their current fan-less 2530/2540 without changing the requirements, except they need to upgrade the uplink to distribution switch to 10 GbE to handle the increased network traffic, and the technical rooms need redundant power.
The WLAN infrastructure will be 1:1 refreshed without new cabling or new AP locations. Their WLAN infrastructure is based on the 200/300 series indoor and outdoor APs running InstantOS (less than 300 APs), the customer has no change in WLAN requirements.
The cruise line company will replace its current Internet connection before the LAN/WLAN refresh. The new Internet connection will provide a 99.8% uptime, which is needed to ensure the paid guest Wi-Fi is always operational. With this new Internet connection, the CIO of the cruise line wants to base the design on the ESP architecture from Aruba because the Internet connection is guaranteed.
Based on best practices, what should you recommend as the correct optic type for the connection between the IDF and the cabins?
Comprehensive and Detailed Explanation From Exact Extract:
Cabling Type in Use:
Each cabin and technical room is connected to the IDF with a single OM2 multimode fiber pair. The maximum length to cabins is 60 meters, and to technical rooms 100--150 meters.
Best Practice for 10 GbE over OM2:
According to Aruba's Campus Access Design Guides and HPE Aruba CX switch transceiver support matrices:
OM2 multimode fiber supports 10GBASE-SR optics up to 82 meters.
Since the maximum run is 60 meters, 10GBASE-SR is fully supported with headroom.
10GBASE-LRM can reach 220 m on MMF, but is not required here because the fiber length is much shorter. SR optics are simpler, lower cost, and recommended in best practices when distances are within OM2 limits.
10GBASE-T RJ-45 (Cat6A) is not applicable, as the cabling is fiber, not copper.
BiDi 40 km optics are for long-haul single-mode fiber links, not short multimode fiber runs.
Aruba Validated Design Reference:
Aruba's Validated Solution Guides for Campus Access state that for short multimode connections (OM2/OM3/OM4), the recommended transceiver type is 10GBASE-SR (SFP+ LC) as it provides the most cost-effective and reliable option within the supported reach.
Requirement Mapping:
Uplinks to access switches in cabins/technical rooms must be 10 GbE capable.
The OM2 cabling length (60--150 m) is within the supported distance for 10GBASE-SR.
Therefore, the correct and most efficient optic choice is 10G SFP+ LC SR 300 m MMF Transceiver.
Final Justification:
Option B is correct because 10GBASE-SR over OM2 supports the required distances, aligns with Aruba design best practices, and avoids unnecessary cost/complexity of LRM or BiDi optics.
Reference Extracts (Aruba Official Study & Design Guides):
Aruba Campus Access Design Guide: recommended transceiver selection for MMF cabling.
Aruba CX Transceiver Guide: 10GBASE-SR supports OM2 up to 82 m, OM3 up to 300 m, OM4 up to 400 m.
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