Log file analysis on a router reveals several unsuccessful telnet attempts to the virtual terminal (VTY) lines. Which of the following represents the BEST configuration used in order to prevent unauthorized remote access while maintaining secure availability for legitimate users?
A. Disable telnet access to the VTY lines, enable SHH access to the VTY lines with RSA encryption
B. Disable both telnet and SSH access to the VTY lines, requiring users to log in using HTTP
C. Disable telnet access to the VTY lines, enable SHH access to the VTY lines with PSK encryption
D. Disable telnet access to the VTY lines, enable SSL access to the VTY lines with RSA encryption
Answer: C. Disable telnet access to the VTY lines, enable SHH access to the VTY lines with PSK encryption
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