Question: What is the purpose of ports?
Answer: Port numbers allow hosts to identify which application processes send and receive data inside TCP and UDP datagrams.
Question: When an engineer wants to verify the application layer (that’s Layer 7) software between source and destination stations, which command should he use?
Answer: Telnet. Telnet is an application that would test all seven layers of the OSI model.
Question: Where should you place standard ACLs in the Network?
Answer: Standard ACLs should be placed as close as possible to the destination to prevent unintended traffic from filtering to your other networks.