You are configuring the software firewall on the broadband m

You are configuring the software firewall on the broadband modem used by one of your small business customers. The customer wants all incoming and outgoing Web and e-mail traffic allowed, wants incoming and outgoing .NET Messenger Service connections blocked, and wants only incoming Telnet connections blocked. You know that the .NET Messenger Service uses port 1863. Of the following, which is the correct firewall configuration?

A. Allow incoming and outgoing connections on ports 25, 80, 110, and 143, block inbound and outbound connections on port 1863, and filter incoming TCP packets on port 23.

B. Allow incoming and outgoing connections on ports 23, 25, 110, and 143, block inbound and outbound connections on port 1863, and filter incoming TCP packets on port 80.

C. Allow incoming and outgoing connections on ports 23, 25, 80, and 143, block inbound and outbound connections on port 1863, and filter incoming TCP packets on port 110.

D. Allow incoming and outgoing connections on ports 23, 25, 80, and 110, block inbound and outbound connections on port 1863, and filter incoming TCP packets on port 143.

Solution

A. Allow incoming and outgoing connections on ports 25, 80, 110, and 143, block inbound and outbound connections on port 1863, and filter incoming TCP packets on port 23.

23 - telnet

80 - http

110 - post office protocol (POP)

143- IMAP

25-SMTP