A technical look at the transport layer, both UDP, TCP, and the new kid at layer 4 called QUIC. A look at the advantages of Google QUIC protocol and the adoption of QUIC with HTTP3. The importance of port numbers that connect applications to applications across the network.

IANA’s role in port numbers and services assigned at layer 4. Understanding client-server software design and the role of layer 4. A look at ephemeral port numbers, sequence numbers, and acknowledgment numbers. Using PowerShell at layer 4, Sysinternals’ TCPview.exe, and Wireshark to demonstrate layer 4. TCP streaming capabilities, use of segments, congestion control algorithms, and reliability. Layer 4 Flood attacks.

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