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Diff: Broadcast

--- Version 2 
+++ Version 3 
@@ -7,10 +7,15 @@ 
 {http://www.gummay.net/images/broadcast.jpg Broadcast!} 
 '''Diagram 1:''' In this situation, server has sent a broadcast to the network. Each workstation receives a copy. 
 
+Related to Broadcast, Multicast is simply a broadcast where the data packet is not sent back to the source port. Where a hub broadcasts, a switch multicasts. For example, OSPF Designated routers multicast link state advertisements to all other OSPF routers in the area using the multicast address of 224.0.0.5. 
+On the other hand, a unicast is simply transfer from one source to a single destination. 
 ---- 
 
 It appears from my quick readings that we have: 
- * Ethernet broadcast 
+ * Ethernet broadcast 
  * Limited broadcast 
  * Directed broadcast 
 It may be worth expanding each of these into their own subsection, especially as we are dealing with multiple subnets in our network. 
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