Concept:Firewalls are network security devices that filter traffic based on user-defined rules. They can be hardware or software and monitor both incoming and outgoing data.
Explanation:Statement (A) is false because firewalls exist as both hardware and software, and they examine traffic entering and leaving a network.
Statement (B) is true: firewalls allow administrators to set rules for which traffic is allowed or blocked.
Statement (C) is false: firewalls cannot automatically stop all malicious traffic; they only block traffic that violates defined rules.
Statement (D) is false: firewalls do not back up data; they only filter or log traffic.
Statement (E) is true: firewalls can block access to specific websites or domains by filtering based on URLs or IP addresses.
Thus, only statements (B) and (E) are correct.
Answer:B. (B) and (E) Only