To scan a host downstream from a security gateway, Firewalking:

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Options

• ASends a UDP-based packet that it knows will be blocked by the firewall to determine how specifically
• BUses the TTL function to send packets with a TTL value set to expire one hop past the identified
• CSends an ICMP ''administratively prohibited'' packet to determine if the gateway will drop the packet
• DAssesses the security rules that relate to the target system before it sends packets to any hops on the

• A
  4% (2)
• B
  78% (39)
• C
  14% (7)
• D
  4% (2)

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