FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

WHAT IS A FIREWALL IN NETWORK SECURITY

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

Detailed explanation-2: -Only specific ports should be allowed. In the case of a web server, it is appropriate to allow ports 80 (HTTP) and 443 (HTTPS). Allow ANY WEB-SERVER HTTP is a solid general rule to follow. TCP ANY WEB-SERVER 3389 – Allows RDP access to the webserver from any source.

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: -Type 1: Packet-Filtering Firewalls As the most “basic” and oldest type of firewall architecture, packet-filtering firewalls create a checkpoint at a traffic router or switch.

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