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This paper gives the details of typical network security model using static VLAN technology and TACACS+ AAA server, also discusses security issues, and their risks, caused by different types of vulnerability, threat, attacks and misconfiguration for VLAN technology, and how prevent it and protect the network by using TACACS+ AAA server, switch and router.

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Wireless Mesh Networks (WMNs) introduce a new paradigm of wireless broadband Internet access by providing high data rate service, scalability, and self-healing abilities at reduced cost. Obtaining high throughput for multi-cast applications (e.g. video streaming broadcast) in WMNs is challenging due to the interference and the change of channel quality. To overcome this issue, cross-layer has been proposed to improve the performance of WMNs. Network coding is a powerful coding technique that has been proven to be the very effective in achieving the maximum multi-cast throughput. In addition to achieving the multi-cast throughput, network coding offers other benefits such as load balancing and saves bandwidth consumption. This paper presents a review the fundamental concept types of medium access control (MAC) layer, routing protocols, cross-layer and network coding for wireless mesh networks. Finally, a list of directions for further research is considered.  Index Terms-Wireless mesh networks, multi-cast multi-radio multi-channel, medium access control, routing protocols, channel assignment, cross layer, network coding. Wireless client Wireless client Wi-Fi Networks Access point Cellular Networks Mesh router with gateway Mesh router