In extreme, connecting two distinct segments (e.g. vlans) with a router external to a standard layer2 switch requires passing the frame from the switch to the router (first L2 hop), making the routing decision inside the router (L3 hop), and then passing the frame back to the switch (second L2 hop). A layer3 switch accomplishes the same task with a single hop, combining the L3 hop with just one L2 hop.
/ (원문,해석이 정확하지 않다고 판단되어 표시)
