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What physical device or software application is used to restrict which TCP and UDP ports can be used by a network device?
ACL
Port Security
HUD Token
Firewall
A Firewall is used to restrict network access. In it's simplest form it will block TCP and UDP ports based on number or protocol, but many modern firewalls include complex algorithms to block unusual traffic, detect possible network attacks and monitor or block traffic based on many other factors.
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