Answer :
Final answer:
A TFTP server is an internal network server used for sending software upgrades to network devices, using the Trivial File Transfer Protocol for simplicity and efficiency in implementation.
Explanation:
The internal network server used for delivering software upgrades to network devices is a TFTP server. TFTP, which stands for Trivial File Transfer Protocol, is a simple, lockstep File Transfer Protocol that allows a client to get a file from or put a file onto a remote host.
One of its primary uses is in the early stages of nodes booting from a local area network. TFTP has been used for this application because it is very simple to implement. For software upgrades specifically, network administrators can use TFTP to send firmware updates to routers, switches, or other network devices. This is often done in an automated manner for efficiency and consistency across the network's devices.
It's important to note the differences between the options provided:
- DNS server translates domain names to IP addresses.
- DHCP server dynamically assigns IP addresses to network devices.
- Proxy server acts as an intermediary for requests from clients seeking resources from other servers.