Open|Filtered state — definition?
Indeterminate port status due to missing responses.
SYN proxy — role?
Intercepts SYNs, answers without revealing internal port info.
Firewall vs load balancer — function?
Firewall controls traffic; load balancer distributes it.
Nmap half-open scan — mechanism?
Sends SYN, analyzes responses to determine port state.
Port knocking — technique?
Sequence of connection attempts to open hidden ports.
Impact of NAT devices — effect?
Can obscure port states; SYN proxy masks true status.
TLS mutual authentication — process?
Both client and server verify identities via certificates.
Open|filtered — caused by?
Missing TCP responses due to network devices or proxies.
SYN proxy — how answers SYN?
Responds with SYN-ACK, delays internal responses.
Firewall/load balancer as proxy — effect?
Can cause ports to show as open|filtered in scans.
Nmap half-open — affected by proxies?
Yes, proxies can cause ambiguous open|filtered results.
Port knocking — purpose?
Hides services, opens ports after correct sequence.
NAT without SYN proxy — effect?
Does not typically cause open|filtered; ports are detectable.
TLS mutual auth — impact on scans?
No, occurs after TCP handshake, doesn't affect port responses.
Testez vos connaissances avec un QCM de 7 questions sur Understanding Port States and Network Security Techniques.
1. What does the 'Open|Filtered' state indicate in port scanning?
2. What is the primary function of a SYN proxy in network security?
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