Foundations lab 4: Ports, DNS and firewalls from inside a VM

لاب الأساسيات 4: البورتات والـ DNS والـ Firewall من جوه VM

Two Linux servers, vm-a and vm-b, live in the same subnet. You will log in to vm-a and test like a network engineer: ping, test TCP ports, resolve names, install a web server on vm-b, and then use a network security group (a stateful firewall) to block HTTP while SSH keeps working.

The 4 tasks you will do

• Task 1 — Reachability: ping and SSH port 22المهمة 1 — الوصول: ping والبورت 22 بتاع SSH
• Task 2 — A closed port, then a web serverالمهمة 2 — بورت مقفول، وبعدين Web server
• Task 3 — Resolve a name with DNSالمهمة 3 — حل اسم بالـ DNS
• Task 4 — Block HTTP with an NSG, keep SSHالمهمة 4 — اقفل الـ HTTP بـ NSG وخلي الـ SSH شغال

The lesson it belongs to

• How networks talk: protocols, ports, DNS, routing and firewalls