Cell definition

Cell definition

A cell is a pair of targets between which CNA schedules tests:

When CNA tests between two CNA agents, a cell is a pair of subzones that have a common parent zone. To determine the real-time network performance of the parent zone, CNA runs tests for each of the zone’s cells.
When CNA tests between a CNA agent and an IP address, a cell is one subzone and one IP address. To determine the real-time network performance between a parent zone and specific IP address, CNA runs tests for each cell.

Example: Cells for testing between CNA agents

Figure 3 shows a sample zone hierarchy for root zone AV. This root zone has two subzones: APAC and US.

Table 6 shows a matrix of zone APAC’s three subzones and the nine cells that they comprise. To test APAC’s network performance, CNA runs tests for each cell shown in the table except for the cells that have Malaysia for a source or destination. Malaysia contains no CNA agents, so it does not participate in any tests.

Figure 3: Zone hierarchy example

Table 6: Test cells for APAC zone
	Beijing	Malaysia	Sydney
Beijing	Cell 1 Beijing to Beijing (intra-zone test)	Cell 2 Beijing to Malaysia	Cell 3 Beijing to Sydney
Malaysia	Cell 4 Malaysia to Beijing	Cell 5 Malaysia to Malaysia (intra-zone test)	Cell 6 Malaysia to Sydney
Sydney	Cell 7 Sydney to Beijing	Cell 8 Sydney to Malaysia	Cell 9 Sydney to Sydney (intra-zone test)

Example: Cells for testing between a CNA agent and IP address

Table 7 shows a matrix of zone APAC’s three subzones and a target IP address. To test network performance between zone APAC and the target IP address, CNA runs tests for each cell shown in the table except for the cell 2, which has Malaysia for a source. Malaysia contains no CNA agents, so it does not participate in any tests.

Table 7: Test cells for APAC zone to 192.168.5.5
	192.168.5.5
Beijing	Cell 1 Beijing to 192.168.5.5
Malaysia	Cell 2 Malaysia to 192.168.5.5
Sydney	Cell 3 Sydney to 192.168.5.5