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if the packet strickly followed the path that is specified by the source its known as STRICT Rounting  and  strict routing ia also known as circuit switching option. if the packet is not follow the path which is defined by the source  or we can say those path selected via router is down so its  ICMP error. which is problem name as parameter problem is send back to source.

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–Strict source routing: sender specifies exact path; if the next hop in the source route isn’t a directly connected network, an ICMP “source route failed” error is returned

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