Anetwork administrator is attempting to troubleshoot an issue regarding certificates on a secure website. during the troubleshooting process, the network administrator notices that the web gateway proxy on the local network has signed all of the certificates on the local machine. which of the following describes the type of attack the proxy has been legitimately programmed to perform? a. transitive access b. spoofing c. man-in-the-middle d. replay

C) Man-in-the-middle

Explanation: Man-in-the-middle attack is the attack where the hacker or attacker receives and passes on communication by manipulating it between victim and entity. These two parties have the middle-man who can alter the communication secretly , without the knowledge of other parties.

The situation mentioned in the question is also similar where the   every certificate on network seems to be signed ,which was not communicated or done by the proxy server or network administrator actually.

Other options are incorrect because transitive access is misusing the access and control leading to information risk. Spoofing is disguising of hacker into reliable device for hacking information. Replay is the playing the content again in repetition.Thus , the correct option is option(C).  

answer; i believe that the correct answer is (a)