D481 - Chapter 5 and 6

Question 1

What are considered “insecure” ports?

Answer 1

20, 21, 23, 25, 53, 69, 80, 161, and 162

Question 2

What are two of the most common Layer 4 Protocols?

Answer 2

Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)

I.e., These are considered the “heart of the Internet Protocol suite”

Question 3

What is a “Socket?”

Answer 3

An instance of a service listening for traffic on a specific port.

Question 4

What Network Layer is considered the most visible layer and why?

Answer 4

The Application Layer

Because it interacts with software applications that need access to network services and resources

Question 5

What does “TCP” stand for?

Answer 5

Transmission Control Protocol (TCP)

Question 6

What does “UDP” stand for?

Answer 6

User Datagram Protocol (UDP)

Question 7

What application is connected to ports 20 and 21?

Answer 7

The “File Transfer Protocol (FTP) data” and the FTP Command

I.e., They are responsible for moving files from one computer to another

Question 8

What principle should be used to configure firewall based on industry best practices?

Answer 8

The “Deny-all” Principle

I.e., You should block everything and allow only what is needed.

Question 9

What port listening on a server is set up to automatically assign Internet Protocol addresses?

Answer 9

User Datagram Protocol (UDP) 67