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MS Netbios UDP ports 137 138

I am doing a vmware microsegmentation project. In reviewing traffic flows, I see a lot of traffic on certain LANs UDP 137 and 138 which I believe is MS Netbios. So app server A might be talking to app server B via UDP at these ports say. if these traffic flows were not permitted within the LAN, what would the impact be on Windows networking?
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Giovanni
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Thank you both very much.