CompTIA A+ Core 1 (220-1101) High-Yield Study Reference
PUBLISHED // 2026-07-12
This is a test high-yield reference guide for CompTIA A+ Core 1 study notes.
Common Ports & Protocols
| Port | Protocol | Purpose |
|------|----------|---------|
| 22 | SSH | Secure Shell for remote access |
| 53 | DNS | Domain Name System name resolution |
| 443 | HTTPS | Secure web traffic |