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Q1 &amp;&nbsp;Q2:<br />
&gt;Do any systems on the outside need to connect to it?<br />
Yes. &nbsp;Only 1 external site (which is our vendor) connects to our internal server.<br />
Historically &nbsp;it was permitted / set up as such years ago so we are now trying to change this ie get the system owners<br />
to migrate to DMZ but was asked to justify. &nbsp;To move the existing servers to a separate VLan by itself involves changing<br />
of IP address &amp;&nbsp;as much effort as moving them to DMZ, so if really need to move, might as well move to DMZ rather <br />
than now creating another VLAN.<br />
<br />
Appreciate if anyone can point me to some authoritative sites/links on this
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&gt;I assume that the system sits on a corporate LAN<br />
Just learnt that in that Developmt corporate LAN, there was previously no DMZ : all servers in a single internal LAN &amp;&nbsp;DMZ was set up about 1 year back (that was before I joined) but everyone just ignored it after a while.
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<div class="content wysiwyg-content">
Network zones are segregated such that DMZ hosts internet-facing servers while internal/secure zone are for servers that don't need access to Internet.<br />
<br />
Q1:<br />
What about servers that are only permitted access to one IP out there in the Internet, say for SMS purposes or sftp, is it Ok to place such server in the<br />
internal/secure zone <br />
<br />
Q2:<br />
if a test/development server is permitted for outgoing to one Internet destination only, is it considered insecure to place it in the internal (non-DMZ) zone?
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Network zones are segregated such that DMZ hosts internet-facing servers while internal/secure zone are for servers that don't need access to Internet.

Q1:
What about servers that are only permitted access to one IP out there in the Internet, say for SMS purposes or sftp, is it Ok to place such server in the
internal/secure zone 

Q2:
if a test/development server is permitted for outgoing to one Internet destination only, is it considered insecure to place it in the internal (non-DMZ) zone?

secure to place an internal server with access to one Internet destination in non-DMZ ?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.