Tohuwabohu excorcism

Demilitarized Zone. The Network-Area, which contains Computers accessable from outside.
The Computers in DMZ can NOT access Computers in local net. The Computers in local net CAN access Computers in DMZ, so that they are forwarded to the internet.

SSH is an application, which encrypts network traffic (packages) and redirects them to the receiver SSH applicaiton.
The receiver SSH decrypts the packages and redirects them to the initial Ports.
So any port may be bypassed thrpugh an ssh tunnel

Checks whether the network can be reached. Resolves the ip by domain.

Checks the domain by ip. Can use a concrete DNS server (e.g. the domain DNS server to resolve the domain controller ip in AWS)

nslookup google.com
Server:         21.1.0.2
Address:        21.1.0.2#53

Non-authoritative answer:
Name:   google.com
Address: 216.58.211.174




nslookup basic.local 21.1.2.35
Server:         21.1.2.35
Address:        21.1.2.35#53

Name:   basic.local
Address: 21.1.3.174
Name:   basic.local
Address: 21.1.2.35