North/south traffic

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

North-south traffic is network traffic entering or leaving a data center through an external network such as a WAN or the internet.

North/south traffic is network traffic entering or leaving a data center through an external network, such as a WAN or the internet. section 15.5 section 15.3.1

Unlike east/west traffic, which flows between servers inside the data center, north/south traffic crosses the data center boundary. Traditional three-tier designs provide the access, aggregation, and core layers used to connect this traffic. section 15.3.1 section 15.5

Figure 15.8 A three-tier data center LAN consisting of an access layer, aggregation layer, and core layer

Use the three-tier data center diagram to locate the layers through which external traffic may enter or exit. section 15.3.1

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes

Defines the traffic direction and contrasts it with east/west traffic, without detailing configuration or verification.

Examples

Uses traffic entering or exiting through the WAN or internet as its concrete example.

What you can do after

Evaluate whether data center traffic crosses the boundary or remains between internal servers.

How it connects

Connects external networks, WAN, internet, east/west traffic, and three-tier data center architecture.

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Related concepts

• network traffickind of · Network traffic is the flow or volume of data, including packets and requests, exchanged across a computer network over time.
• service communicationcontrasts with · Service communication is the exchange of requests, responses, messages, or data between distinct services across process or network boundaries.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.