Question: Network firewall systems a) Operate at the physical layer (Layer 2 in OSI model) b) Are very effective for stopping denial of service (DoS) attacks

Network firewall systems a) Operate at the physical layer (Layer 2

Network firewall systems a) Operate at the physical layer (Layer 2 in OSI model) b) Are very effective for stopping denial of service (DoS) attacks c) Can operate alongside intrusion detection systems (IDS) d) Both a and c e) None of the above

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