Merge pull request #304243 from vishalme/patch-17

Update expressroute-faqs.md

Author: prmerger-automator[bot]

articles/expressroute/expressroute-faqs.md

@@ -154,7 +154,7 @@ Supported bandwidth offers:
 
 ### What's the maximum MTU supported?
 
-ExpressRoute supports the standard internet MTU of 1,500 bytes. See [TCP/IP performance tuning for Azure VMs](../virtual-network/virtual-network-tcpip-performance-tuning.md) for tuning the MTU of your VMs.
+ExpressRoute supports the MTU of 1,400 bytes. See [TCP/IP performance tuning for Azure VMs](../virtual-network/virtual-network-tcpip-performance-tuning.md) for tuning the MTU of your VMs.
 
 ### Which service providers are available?