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To help mitigate the effects of a denial of service attack,
which mechanism can an Internet service provider (ISP) use
to identify Internet protocol (IP) packets from unauthorized
sources?
A. Inbound traffic filtering
B. Rate limiting
C. Reverse address lookup
D. Network performance monitoring
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Answer: A
ISPs serve user organizations with pre-assigned IP
addresses. Inbound traffic filtering can filter out IP
packets that do not conform to the pre-assigned IP address
range. Rate limiting involves limiting the occurrences of
certain types of TCP/IP packets according to predefined
specifications. It is used to identify excess packets.
Reverse address lookup determines if the source address is
an IP packet of the true address of the computer (host) that
is actually sending the packet. It would identify address
substitution, but would not initially identify that it was
an unauthorized source. Network performance monitoring is a
way to monitor system performance for potential intrusions
on a real-time basis. It could help identify unusual traffic
volumes.
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