An engineer is designing an outdoor mesh network to cover several sports fields. The core of the network is located in a building at the entrance of a sports complex. Which type of antenna should be used with the RAP for backhaul connectivity?
C. 5 GHz, 14-dBi patch antenna
Here's the rationale for this choice:
5 GHz Frequency Band: The 5 GHz band is generally preferred for backhaul connectivity in a mesh network due to its larger bandwidth capacity and reduced interference compared to the 2.4 GHz band. This is particularly important in an outdoor setting like a sports complex, where there might be other sources of interference.
14-dBi Patch Antenna: A patch antenna with a high gain (14 dBi) is directional and focuses the signal in a specific direction, which is ideal for backhaul links where the signal needs to travel a longer distance from the RAP to other access points in the network. The directional nature of the patch antenna helps in maintaining a strong and focused signal, increasing the link's reliability and performance.
omnidirectional antennas is used to cliente conectivity (2.4Ghz), to backhaul we use directional antennas with good gain and ins 5Ghz. So C is correct.
Cisco Cert Guide Chap7 pag. 146, 147.
A) it is correct
high-gain antenna configuration is recommended only for connecting a RAP to the MAP. To optimize mesh behavior, omnidirectional antennas are used because mesh links are limited to one mile (1.6 km). The curvature of the earth does not impact line-of-sight calculations because the curvature of the earth changes every six miles (9.6 km).
https://www.cisco.com/c/en/us/td/docs/wireless/technology/mesh/8-0/design/guide/mesh80/m_site-preparation-and-planning.html
This question should have a diagram/map showing location data as to where this entrance is located with regard to the fields, as such we cannot answer the question accurately beyond the fact that it should be 5.0GHz.
As it's about a sports complex, I assume that distances are long between APs and that APs are deployed in a serial manner, one after another, with the RAP being the first AP in the line near the entrance.
In order to cover long distances, you need a directional antenna with appropriate gain value, so I vote for C.
I don't think that an omnidirectional antenna in the RAP with a lower gain could provide sufficient RSSI for MAPs to be able cover the distance of the whole complex.
Of course, a walkthrough survey would help in the final decision.
its not mandatory that app MAP should connect to the RAP. so that several sport field will be in directional way for distributed places , even its distributed MAP can be connected to another MAP too then it will reach to the RAP
it doesnt say how the sports complex are distributed so normally they are spread over a core building, as it suggest the question. Hence, you should think in an omnidirectional. Besides, it does not say how far are the sports fields, so its understandable that are not quite far from the core building either. Therefore 8 dBi should be enough. I would go for A.
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