A firewall allows staff PCs to open outbound connections to TCP 443 on the internet but has no inbound rule for web traffic. Pages still load. Why do the replies get through?
Un pare-feu autorise les PC du personnel à ouvrir des connexions sortantes vers TCP 443 sur Internet, mais n'a aucune règle entrante pour le trafic web. Les pages se chargent quand même. Pourquoi les réponses passent-elles ?
Answers
AReplies always come back on port 80, which firewalls never blockLes réponses reviennent toujours par le port 80, que les pare-feu ne bloquent jamais
BThe web servers send their replies using ICMP messages instead of TCP segmentsLes serveurs web envoient leurs réponses sous forme de messages ICMP au lieu de segments TCP
CA stateful firewall recognises replies to connections that staff openedUn pare-feu à états reconnaît les réponses aux connexions ouvertes par le personnel
DFirewalls never filter inbound traffic, only traffic going outwardLes pare-feu ne filtrent jamais le trafic entrant, seulement le trafic sortant
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