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ccna worth in pakistan.Figure 13.6 STP example network path overhead is 0. When other switches receive these BPDUs, they add the path overhead to the overhead of the BPDU's inbound port. switch 2 adds 20 to the path overhead when the BPDU enters port E and 10 to the path overhead when it enters port F. switch 2 first compares the path overhead, while port F has a lower path overhead and is therefore selected as the root port , and Figure 13.8 uses RP to identify the root port. Switch 3 also has two paths to the root switch, which go through ports C and D. Port C has a cumulative path overhead of 10, while port D has 70, so port C is chosen as the root port. Switch 4 also has two ports available to the root switch: H and G. Port H has a cumulative path overhead of 30, while G is 50, so Switch 4 selects port H as the root port. Switch 5 has two ports (A and B) with cumulative path overheads of 10 and 40, respectively, so Switch 5 selects port A as the root port. Note that all switches in the network run STP at the same time to determine who is the root switch and which of their ports should be the root port. This is also true when selecting a designated port for a network segment, which is discussed in the next subsection.Switch 2 0001.0001.0001FLAN segment DLAN segment C CSwitch 3 0001.0000./C1DLAN segment BA10 LAN segment A E20Switch 5 0000.0001. A134 10 LAN segment BRP