troubleshooting Question

Network setup between buildings

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BenderamaFlag for Belgium asked on
* WANNetworkingNetwork Architecture
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Hello,

I need some input about a network setup we are going to deploy next year,
We are building a small campus with 3 buildings about 30meters (100ft) apart, one main building and 2 smaller buildings.
The main building has about 45 LAN  (RJ45) connections and the smaller building have 20 each.
On the main site we have the WAN connection, servers, NAS devices (backup). The rest of the network contain client computers and VOIP phones. We don’t have that much traffic on the LAN but I want to back-up the servers (about 1TB/night) to a NAS in one of the smaller buildings to have a “free” cloud back-up solution using VEEAM backup & replication.

We have:   1 x 48 Cisco Catalyst 2960-X Series switch (WS-C2960X-48LPS-L) SWITCH (Main building)
                    2 x 24 Cisco Catalyst 2960-X Series switch (WS-C2960X-24PS-L) SWITCH (Smaller buildings)

I've been asked to tell the building company what cables to use and how to deploy them.
First they suggested to use 4 UTP cables between each building which sound to me like a really BAD solution, the second solution was to attach FTP CAT5E cables to each RJ45 outlet and pull them all to the main building.  But I don’t really like this option because of the cost of the cables and the setup.

I suggested to use 2 fiber cables from the main building to each of the sites (one to use and one as reserve in case something went wrong with the main fiber cable)
Since we have the Cisco Switches I wanted to buy 4x SPF fiber connectors and connect the 2 sites to the main building with one fiber per site. And order Multi-mode fiber cables that are already terminated so we don’t have this extra cost.

Is this a good solution? It is ok to use Multi-mode fiber instead of single-mode?
Do our Cisco switches support all this?
I’m used to working with smaller LANS and have never used fiber when I wasn’t inplace before I got there so this is kinda new ground for me.
Thank you for your opinions!
ASKER CERTIFIED SOLUTION
Dr. KlahnPrincipal Software Engineer

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