D-Link DES-1228P - Manual (Page 57)

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Figure 41 – QoS > 802.1p Default Priority
Security > Safeguard Engine
D-Link’s Safeguard Engine is a robust and innovative technology
that automatically throttles the impact of packet flooding into the
switch's CPU. This function helps protect the Web-Smart Switch from
being interrupted by malicious viruses or worm attacks. By default
this is Enabled.
Figure 42 – Security > Safeguard Engine