Understand packet anatomy and protocol mechanisms: OSI vs TCP/IP models, IP addressing & CIDR subnetting, ARP, DNS, DHCP, and packet capture analysis with Wireshark.
What you'll practise: Capture a TCP handshake and label each step in Wireshark; Follow a DNS lookup through a packet capture; Trace ARP and DHCP traffic on a practice network; Filter a capture from the command line with tcpdump and tshark; Solve a set of hands-on subnetting challenges.