You are configuring a network firewall to allow SMTP outbound email traffic and POP3 inbound email traffic. Which of the following TCP/IP ports should you open on the firewall? (Select two.)

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	21
B	25
C	110
D	143
E	443

Explanation:

Detailed explanation-1: -For instance, if you run a mail server and provide your clients POP3 access, and you also run an FTP and Web server, you will want to allow external access to ports 25 (SMTP), 110 (POP3), 20 and 21 (FTP), and 80 (HTTP). If you also have SSL-enabled Web pages, you will want to open port 443 (HTTPS).

Detailed explanation-2: -Therefore, the only port(s) that need to be opened in the firewall are the http port (default 18080), and/or the https port (default 8443).

Detailed explanation-3: -Which port needs to be enabled to allow secure transactions? EXPLANATION To perform secure transactions, SSL on port 443 needs to be enabled. HTTPS uses port 443 by default.

Detailed explanation-4: -Which protocols and port numbers are used by DHCP? (Select two.) The dynamic host configuration protocol (DHCP) uses port 67 for both the TCP and UDP protocols.

There is 1 question to complete.

COMPUTER NETWORKING

NETWORK SECURITY

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