问题描述：
英语翻译
A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications.It is a device or set of devices which is configured to permit or deny computer applications based upon a set of rules and other criteria.
A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications.It is a device or set of devices which is configured to permit or deny computer applications based upon a set of rules and other criteria.
问题解答：
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