What are the threats to a network of 30 computers based on a simple TL-WR1045ND router with a 30-port switch?

Question

System administration

ip addresses on most computers are not even registered! No Active Directory Server No Proxy No Control! Only free avast antiviruses and some kind of protection against flash drive viruses. There is a firewall only in the router, and then with the default settings. Installed home versions of windows 7 (Updates are disabled and everything works).
What is the main threat? If even ip addresses are not registered on half of the computers, then there is no danger of a network virus that will infect all computers at once?
What can happen to such a network? In steep networks, the server may break and the network will fall. And what can happen here?
there are no such viruses that through the router quickly recharged 30 computers with free avast? means the router is in some cases more reliable than the server?

Answer 1

ip addresses on most computers are not even registered!

Well, in normal networks, no one prescribes them. That's what DHCP is for.

What are the threats to the network

- computers will break, the office will be flooded with water, the Economic Crime Department will come, catch a malicious program, passwords from the bank where the money is stored will leak ...
In general, everything is like everywhere else.
It would be necessary to first decide what is valuable there and what needs to be protected, and only then think about how to make this protection.

Answer 2

What is the main threat?

Users!
A very strange conclusion.
Considering that the addresses, although they are not registered, are the computers still on the network and, perhaps, receive addresses from the router?
And this is even better, the seven can work without "network settings", due to all sorts of new technologies.
And then the switch or router will break and either the network or Internet access will also fall.

Answer 3

If the door is not locked, but simply closed so that it looks like it is locked, what will happen? That's about the same - anything
can happen - Any encryption virus is guaranteed to put the entire network. And not a cryptographer either, and besides, it will break something. - Any strange script on a strange site turns all
computers into members of a botnet that starts sending spam/DDoS/mining crypto/something else...
, and at the same time can rub it on all computers
- Not to mention the fact that people can (and will certainly!) laze around, sit in social networks, mind their own business (or even work on the side)
- The switch or router is dead - the work has stopped.

Answer 4

Yes, you will be fine. Or it won't. Someone drives unfastened for years, and the other loves ladies with reduced social responsibility without any protection, and nothing happens to them. But it is by no means certain that this will always be the case. The fact is that pulling out hair begins at the moment when a fried cock pecks at this very well - well, that's always the case. It's just that he can peck, or maybe not, then how lucky. Most people are lucky, so "a-we-ninada, all these antiviruses and incomprehensible updates of yours only take time! and in general - what will happen to the files on the hard drive? - it's iron!" Actually, the first thing to do is to organize an automated backup of all important information. I personally know the office in which "anamninada!" it was exactly until the evil ransomware infected the secretary's computer, on which - suddenly! - there was a bunch of documents, copies of which were nowhere to be found. They restored bit by bit - somewhere there was something on flash drives (which I hate fiercely, because users stubbornly perceive them as a reliable repository of information and still say so proudly - "but I haveallon a flash drive!"), they tried to find something on other computers, and I cosplayed Doctor Evil, because "I warned you!" After that, a primitive backup server was installed in the office, assembled from matches and acorns and from what was found in the back room at the supply manager, because "there is no money!", but the further development of the infrastructure was prevented by a toad, which categorically refused to install normal OSes, instead of assemblies broken by Uncle Vasya with tightly cut updates - "everything works! still pay money for it ?!" And, of course, the toad did not order the "tyzhkomputershchik", who "only pokes buttons", to pay for putting in order either. The shell hit the same funnel a second time - the secretary's computer was again struck , again a ransomware from the mail, but!- this time there were backups, of which infa was restored. I would like to write about a happy end, in which the office became correct and realized that it was necessary to somehow invest in IT, but no, this did not happen - something was put in order, somewhere a toad said a weighty word ... So live - from a rooster to a rooster that periodically pecks.

Answer 5

hire an admin

Answer 6

I like your company and the way you think. You are all great! Keep it up!
Especially

means the router is in some cases more reliable than the server?

Jokes aside, in some cases it is.

Answer 7

There is no virus encoder that does not know Avast and who would have encrypted all the computers on the network in a day or made them unbootable ?! If there is a name for the studio?

Answer 8

Apparently we are not dealing with a pest. And the owner is miserly. ) Or a novice admin who wants to prove that he is a super cool due to his super low qualification. The answer to your question sounds simply
WHAT DO YOU HAVE TO GET HACKED?) The more goodies ... the higher the likelihood that you will be loaded with the left firmware on the router. Then one of the hundreds of vulnerabilities of the seven will be used ... dns will be compromised ... or any other elementary shnyaga and one day a message will appear on all computers asking you to pay a lot of money)
And avast is not a panacea. As long as the virus is not in its database ... heuristic analysis may not understand that it is a threat. And kirdyk)