Final answer:
The type of attack that involves ongoing attempts to gain access to a specific account is likely a Password-guessing attack, characterized by repeated efforts to enter the correct password.
Step-by-step explanation:
If your system log files report an ongoing attempt to gain access to a single account, the type of attack you are most likely experiencing is A. Password-guessing attack. This type of cyberattack involves a hacker trying different passwords in an attempt to gain unauthorized access to user accounts. Unlike a backdoor attack, which involves exploiting a hidden method of gaining unauthorized access to a system, a password-guessing attack is brute-force and direct. Similarly, a worm attack is associated with malicious software that replicates itself to spread to other computers, which does not match the scenario described. Lastly, TCP/IP hijacking involves taking over a communication session between two entities which is not what is being reported in the scenario of a single account being targeted.
The ongoing attempt to gain access to a single account on your system lo files indicates a password-guessing attack. In this type of attack, hackers use trial and error to guess the correct password by trying multiple combinations. They may also use automated tools or scripts to speed up the process. Once they gain access to the account, they can cause various forms of damage or obtain sensitive information.
To protect against password-guessing attacks, it is important to use strong and unique passwords that are not easily guessable. Additionally, implementing measures such as account lockout after multiple failed login attempts can help deter such attacks. Two-factor authentication can also provide an extra layer of security.