TCP/IP, DNS internals, packet analysis, VLANs and routing.
TCP/IP Stack
OSI vs TCP/IP, handshakes, flags, MTU and fragmentation.
DNS Internals
Record types, resolution flow, zone transfers, DNS attacks.
Packet Analysis
Wireshark and tcpdump filters, protocol dissection.
VLANs & Routing
Segmentation, trunking, ACLs, routing fundamentals.
Network Scanning
Discovery, port states, service and OS fingerprinting.