Chapter 2. Networking for Packet Analysts

Packet analysis is all about analyzing how applications transfer useful data from point A to point B over networks. So, an understanding of how networks function is essential.

In this chapter, we will cover the following topics:

• Why the seven-layer OSI model matters
• IP networks and subnets
• Switching and routing packets
• Ethernet frames and switches
• IP addresses and routers
• WAN links
• Wireless networking

The seven-layer OSI model will be mapped to the most common networking terms, and we'll review frames, switching, IP addressing, routing, and a few other networking topics of interest. The goal is to develop a mental model of networking that lends itself well to packet-level analysis.