Network
transport
dns
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
* Ports 12000-17000 - UDP * Port 80 and 443 - TCP * Ports 5060 and 5062 - UDP * Ports 3478 and 3479 - UDP * Ports UDP 27901:27999 * Ports TCP 10001 * Ports TCP 47600:48000
TCP operates at transport layer
UDP and TCP sockets are layer 4 ports which are associated with certain services, ie TCP80 refers to the HTTP (web) protocol, TCP443 refers to the HTTPS (SSL) secure protocol and TCP/UDP53 refers to DNS.
There is a good descrition of the network layer and TCP in the related link. NO. In general TCP and UDP are transport protocols that operates in Layer 4 Transport Layer
The tcp layer
Blocking these ports should do the trick as they are the ports that WoW uses to communicate with the servers: 3724 TCP 6112 TCP 6881-6999 TCP
fourth layer
TCP Port 88
The Transport layer