NETWORK SECURITY
FIREWALLS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Open port 80 to allow SNMP service.
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Open port 80 to allow SMTP service.
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Open port 25 to allow SMTP service.
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Open port 110 to allow POP3 service.
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Open port 25 to allow SNMP service.
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Detailed explanation-1: -After blocking a number of ports to secure your server, you are unable to send email. To allow email service, which of the following needs to be done?-Open port 25 to allow SNMP service.
Detailed explanation-2: -The solution The easiest solution is to configure your email client and set your outgoing port to 465 with SSL (recommended) or 587 with (STARTTLS). Another option is to use your ISP’s SMTP server.
Detailed explanation-3: -The standard port used for SMTP connections is 25. An ISP (Internet Service Provider) may block port 25 in order to prevent spamming by its customers. With port 25 being blocked, you won’t be able to host your own mail server at home or work.
Detailed explanation-4: -Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587-this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.
Detailed explanation-5: -To remove the port 25 restriction on your Lambda function, associate your function with an Amazon Virtual Private Cloud (Amazon VPC). Then, give internet access to your Lambda function using a network address translation (NAT) gateway. The port 25 restriction can’t be removed from non-VPC functions.