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+# lec6
+
+## Content Distribution Networks
+
+> tdb
+## Sockets
+
+### Connections
+
+Any time we setup some type of connection there's also some handshake between both nodes between client & server.
+With `UDP` however there is _no_ concept of a connection. 
+Instead we send data directly to an address.
+
+With TCP connections however we do assume the concept of a connection which means we have to have that handshake between client and server in order to anything with the target server.
+This handshake creates a socket on the server and on the client machine through which both can communicate.
diff --git a/cst337/lec/lec5.md b/cst337/lec/lec5.md
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+# lec5