 
                                                    
                                               With 12 SFP slots,  the DGS-3612G provides a full fibre environment for long distance Ethernet infrastructure. It is particularly suitable for ISPs in their Metropolitan Area Network (MAN) deployments. In addition,  four 1000 Base-T copper ports acting as combo with 4 of the SFP slots are included for flexibility. With D-Link Single IP Management (SIM) technology,  up to 32 switch units -regardless of the model- may be combined in a virtual stack. Multiple switches can be configured,  monitored & maintained from any workstation running a web browser via a single IP address. The stack is managed as a single object,  as all stacked units are identified by this single IP address. A simple yet powerful web-based interface allows the administrator to perform most management & configuration tasks. The DGS-3612G 
 Includes:: advanced routing features,  such as OSPF v 2,  Passive Interface,  Not-So-Stubby Area (NSSA),  Equal Cost Route & RIP. Multicast services such as IP-TV & Video on Demand (Vo D) are supported with the inclusion of protocols such as IGMP,  MLD & PIM. With Double VLAN (802.1Q-in-Q) support,  ISPs can create Layer 2 Virtual Private Networks (VPNs) & transparent LANs for their customers. A complete set of security features is provided for connectivity & access control. These include Access Control Lists (ACLs) based on MAC address,  switch port,  IP address and/or TCP/UDP port numbers. 802.1X Authentication & MAC address control functionality is furthermore featured. The switch also provides central management for administration access via TACACS/TACACS+ & RADIUS. In addition,  when implemented in conjunction with a D-Link Net Defend firewall,  this switch is able to automatically quarantine any host displaying abnormal behaviour. This mechanism,  D-Links Zone Defense,  provides proactive network security by preventing viruses from spreading through the network & thwarting harmful network attacks. The DGS-3612G switch provides VLAN support including G                                             
