STEM · Full roadmap · ~110 min read · 34 steps

🌐IT Support Level 3: Network and Server Support

Diagnose networks, subnet by hand, and support servers like an L3 engineer

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Learning path

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What changes at level 3

The OSI model as a map

Layers you will actually touch

TCP/IP model and encapsulation

IPv4 addresses and what they mean

CIDR notation and the slash

Subnetting: the host count

Subnetting: finding the ranges

Private ranges and NAT

A short word on IPv6

DNS, the name to number system

DHCP, automatic addressing

Common ports and protocols

Switching: MAC tables and VLANs

Trunking and spanning tree

Routing: moving between networks

Dynamic routing and where OSPF and BGP live

Network hardware in the rack

Wireless: bands, channels, and interference

Enterprise wireless and 802.1X

Troubleshooting methodology

The diagnostic toolkit

Firewalls and basic network security

Server roles and operating systems

RAID levels explained

Virtualization and hypervisors

Active Directory and FSMO roles

Group policy and managing the fleet

Monitoring and alerting

Backup and disaster recovery

Where cloud fits and why your skills transfer

Common mistakes and a practice routine

Where to go next

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