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A network, attack is an attempt to gain (71) access to an organization’s network, with the objective of stealing data or performing other malicious activities. Plagiarism is A ( 72 )-of-service (DoS) attack is a cyber-attack in which the attacker seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely di srupting, services of a host connected to a network. In the case of a simple attack,a (73) could have a simple rule added to deny all incoming traffic from the at tackers, based on protocols, ports, or the originating IP addresses. In a (74) DoS (DDoS) attack, the incoming traffic flooding the victim  originates from (75) different sources. This effectively makes it impossible to stop the attack simply by blocking a single source.

(71 ) A. unauthorized

B. authorized

C. normal

D. frequent

(72) A. defense

B. denial

C. detection

D. decision

(73) A. firewall

B. router

C. gateway

D. switch

( 74) A. damaged

B. descriptive

C. distributed

D. demanding

(75) A. two

B. many

C. much

D. ten