A network technician observes that certain diagnostic packets used to monitor network connectivity are not reaching their destination within the corporate network. Which of the following options related to packet headers is a plausible explanation for the dropped or missing packets?
Security settings on a firewall are incorrectly blocking these diagnostic packet transmissions.
The network interface card on the sending system is outdated, causing transmission failures.
The destination devices are configured to reject all incoming diagnostic requests.
The Time to Live value of the packets decreases to zero before reaching their intended destination, leading to their disposal by intermediate routers.
Of the given options, only one related to both the packet headers and is a plausible explanation of the issue. TTL is a field in the packet header that decrements by one each time the packet traverses a router. If TTL expires (i.e., reaches zero), routers discard these packets to avoid them circulating indefinitely within the network. This mechanism helps manage network traffic and prevents issues such as routing loops, ensuring efficient utilization of network resources.
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What exactly is the Time to Live (TTL) in a packet header?
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How does the expiration of TTL help with network efficiency?