COMPUTER NETWORKS AND COMMUNICATIONS
NETWORK SECURITY AND CYBERSECURITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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tcp 143
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tcp 21
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tcp 443
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tcp 389
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Detailed explanation-1: -IMAP was designed with the goal of permitting complete management of an email box by multiple email clients, therefore clients generally leave messages on the server until the user explicitly deletes them. An IMAP server typically listens on port number 143. IMAP over SSL/TLS (IMAPS) is assigned the port number 993.
Detailed explanation-2: -IMAP4 server FQDN: mail.contoso.com. TCP port: 993 for always TLS encrypted connections, and 143 for unencrypted connections or opportunistic TLS (STARTTLS) encrypted connections.
Detailed explanation-3: -IMAP ports 143 – this is the default port which does not provide any encryption. Port 993 is the secure port for IMAP and it works over TLS/SSL encryption.
Detailed explanation-4: -Description: Imap protocol is used by eMail clients for the retrieval of their eMail from designated eMail “post office” servers. Email Clients such as Microsoft Outlook, Netscape, Eudora, and many others, using imap protocol to retrieve their eMail, connect to port 143 of a remote eMail server.