Hands-on experience in networks, servers and business communications.
Learn the layers of the OSI and TCP/IP models with real examples: what each layer does, which devices and protocols live there, and how the layers help you find network problems faster.
· 3 min read
What an IP address is, what the subnet mask and gateway do, how private and public IPs differ, and how to calculate subnets with one simple table instead of complicated formulas.
· 3 min read
Hubs, switches and routers each work at a different layer. This part shows what each one does with packets, what MAC addresses and the ARP table are, what VLANs are for and how a layer 3 switch differs.
· 3 min read
The difference between TCP and UDP, the three-way handshake, what a port is and the list of important ports every network engineer and Network+ candidate should know, with commands to check whether a port is open.
· 3 min read
DNS turns website names into IP addresses and DHCP gives devices IP addresses automatically. This part covers how both work, the important DNS records, the DHCP DORA process and the commands for troubleshooting them.
· 3 min read
Types of network cable and the differences between Cat5e, Cat6, Cat6A and Cat8, the T568A and T568B wiring standards, shielded cable, and single-mode and multi-mode fibre, with practical tips for choosing and installing cabling.
· 3 min read