A Technician Must Configure a Firewall to Block External DNS

question 770

Multiple Choice

A technician must configure a firewall to block external DNS traffic from entering a network. Which of the following ports should they block on the firewall?

• A) 53
• B) 110
• C) 143
• D) 443

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Definitions:

Covalent

A type of chemical bond where atoms share pairs of electrons.

Ionic

Relating to ions or the formation of ions by the gaining or losing of electrons, often discussed in the context of chemical bonds.

Metallic

Pertaining to, composed of, or resembling metal; having the characteristics or qualities of metals.

Intermolecular

Relating to the forces or interactions between molecules, which determine phase states and properties of substances.