The port number is “ephemeral port number”, if the source host is _______a)NTPb)Echoc)Serverd)ClientCorrect answer is option 'D'. Can you explain this answer?

Question

The port number is &ldquo;ephemeral port number&rdquo;, if the source host is _______a)NTPb)Echoc)Serverd)ClientCorrect answer is option 'D'. Can you explain this answer?

Answer

Explanation:

Client as the Source Host:
- When the source host is a client, the port number used is known as an 'ephemeral port number.'
- Ephemeral port numbers are randomly assigned by the client's operating system from a specific range of port numbers (49152 to 65535).
- These ports are used for outgoing connections to servers on the internet.

Role of Ephemeral Port Number:
- Ephemeral port numbers are temporary and dynamically allocated for the duration of a specific network connection.
- They help in uniquely identifying each connection that a client makes to a server.
- Once the connection is terminated, the ephemeral port number is released back to the pool for reuse.

Client-Server Communication:
- In a client-server communication model, the client initiates a connection to the server using an ephemeral port number.
- The server, on the other hand, uses a well-known port number (e.g., port 80 for HTTP) to listen for incoming connections.

Conclusion:
- In the context of port numbers, when the source host is a client, the port number used is an ephemeral port number.
- This allows for the establishment of unique connections between clients and servers on the internet.

Answer

Port numbers from 1025 to 5000 are used as ephemeral port numbers in Windows Operating System. Ephemeral port numbers are short-lived port numbers which can be used for clients in a UDP system where there are temporary clients all the time.

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