NetBios Sdn. Bhd. is a local engineering company that has planned to expand their services and location in one of the branches (Ren in Johore. The KL HQ has simple network architecture. Clients' workstations are connected to an access switch, distributed switch and internal interface. Vlan technology has been deployed in both sites. The firewall's (DMZ_Router-Firewall) external interface connects directly to the internet service provider (ISP) router. The third interfa hosts a demilitarised zone (DMZ) hosting several servers. These servers include Web, DNS and FTP applications. Whereas in Johore r network administrator has planned to replace the current configuration with new VLAN design in order to make the network more enhance the security of the network especially in HQ branch in KL. For the new Remote Branch in Johore, the network administrator deploy WLC WLAN to ease the configuration of Wireless network and its access. In all the networks above the network administrator has noticed that Layer 2 defense has been compromised.

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