Week 1

Users, Permissions, Processes

Services, Logs, Environment

SSH

DNS and TLS

CIDR and Subnets

Practice

Assignment

Cloud Track

Under construction

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Implementation plan:

• Recap from core program: IP addresses, ports, client-server model, HTTP methods/status codes
• DNS deep dive: what happens when you type a URL — resolution chain
• DNS record types: A, AAAA, CNAME, MX, NS, TXT
• dig and nslookup for DNS troubleshooting
• HTTPS and TLS: what TLS adds on top of HTTP
• TLS handshake — simplified (client hello, server hello, certificate, key exchange)
• Certificates: what they are, certificate authorities, Let's Encrypt
• Practice: use dig to resolve domains, inspect a TLS certificate with openssl s_client

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