Identify which of the services below uses both TCP and UDP ports.Group of answer choicesFTPTFTPDNSSSHTelnet

The service that uses both TCP and UDP ports is DNS (Domain Name System).

Here's a step-by-step explanation:

1. FTP (File Transfer Protocol): This service uses TCP ports. It uses TCP because it requires a reliable connection for transferring files, which TCP provides.

2. TFTP (Trivial File Transfer Protocol): This service uses UDP ports. It's a simpler, less secure version of FTP that doesn't require authentication.

3. DNS (Domain Name System): This service uses both TCP and UDP ports. It primarily uses UDP for speed, but it can use TCP as well when the data to be exchanged is too large for a single UDP packet, or for tasks that require reliable delivery such as zone transfers.

4. SSH (Secure Shell): This service uses TCP ports. It provides secure remote login from one computer to another.

5. Telnet: This service uses TCP ports. It's used for remote login and executes commands on remote machines, but it's not secure because it doesn't encrypt its data.

So, the answer is DNS.