Lesson 3: Network Services and Protocols
Week of Tue, Sep 29 · lesson closes Mon, Oct 5
Take Meerk's quiz for Lesson 3
This lesson's items
Exact due times are in Canvas.
Watch — Professor Messer
Watch — Professor Messer: Network Services (220-1201)
Free, independent educational resource. Not affiliated with or endorsed by CompTIA. Watch, then read the notes below.
Know these cold
- Port numbers: HTTP=80, HTTPS=443, SSH=22, FTP=20/21, SMTP=25, DNS=53, RDP=3389, DHCP=67/68.
- DNS resolves hostnames to IPs. Troubleshoot with nslookup/dig. A record=IPv4, AAAA=IPv6, MX=email.
- VPN types: SSL VPN (HTTPS-based, browser), IPsec (tunnel mode), Split tunneling vs. full tunneling.
Meerk's quiz — open the Lesson 3 gate
10 questions, no time limit. 85% on your first attempt in a 24-hour window opens the gate. Retakes inside the window are practice — they help you learn, they don't count. Work alone; the point is to know it, not to have seen it.
Dinner Table Question
Ask at home: When you use a VPN, where does your internet traffic actually go?
En español: Cuando usas una VPN, ¿a dónde va realmente tu tráfico de internet?