A technician wants to block remote logins to a server.
Which of the following ports should be blocked?
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A. B. C. D.A.
To block remote logins to a server, you need to block the ports that are typically used for remote access protocols. There are several protocols that are commonly used for remote access, such as Remote Desktop Protocol (RDP), Telnet, and Secure Shell (SSH), among others.
Of the four ports listed in the question, none of them are typically used for remote access protocols. Instead, they are used for other types of network traffic:
A. Port 21 is used for FTP (File Transfer Protocol), which is a protocol for transferring files over a network.
B. Port 53 is used for DNS (Domain Name System), which is a protocol for translating domain names into IP addresses.
C. Port 80 is used for HTTP (Hypertext Transfer Protocol), which is the protocol used for serving web pages.
D. Port 443 is used for HTTPS (HTTP Secure), which is a variant of HTTP that uses SSL/TLS encryption for secure communication.
To block remote logins to a server, you should block the ports that are typically used for remote access protocols, such as RDP (port 3389) or SSH (port 22). However, since the question does not provide enough information about the type of server or the remote access protocols being used, it is difficult to give a definitive answer.