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Networking & Security Fundamentals

Network Architecture & Security Concepts

4.1 Enterprise Networking Concepts

**4.1.1 OSI Model & Troubleshooting**

**4.1.2 Network Security Zones**

Internet (Untrusted) ↓External Firewall ↓DMZ (Semi-trusted)├── Web Servers├── Email Gateway└── Reverse Proxy ↓Internal Firewall ↓Internal Network (Trusted)├── Production VLAN├── Management VLAN└── Guest VLAN

**4.1.3 Common Ports & Protocols**

Service | Port | Protocol | Usage-------------------- |------- |---------- |------------------------HTTP | 80 | TCP | Web trafficHTTPS | 443 | TCP | Secure web trafficSMTP | 25 | TCP | Email sendingPOP3 | 110 | TCP | Email retrievalIMAP | 143 | TCP | Email retrievalDNS | 53 | UDP/TCP | Name resolutionDHCP | 67/68 | UDP | IP configurationLDAP | 389 | TCP | Directory servicesLDAPS | 636 | TCP | Secure LDAPRDP | 3389 | TCP | Remote desktopSMB | 445 | TCP | File sharingKerberos | 88 | TCP/UDP | AuthenticationNTP | 123 | UDP | Time sync

Lab 4.1: Network Troubleshooting Toolkit

Module 5: PowerShell & Automation Basics Day 12-15: PowerShell for M365 Administration

5.1 PowerShell Fundamentals

**5.1.1 Essential PowerShell Modules****5.1.2 Connection Scripts** 5.2 Automation Scripts for Daily Tasks**5.2.1 User Provisioning Script**

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