What is the purpose of the TTL field within an IP packet header?
- clears an unreachable route from the routing table after the invalid timer expires
- prevents regular update messages from inappropriately reinstating a route that may have gone bad
- removes an unreachable route from the routing table after the flush timer expires
- limits the period of time or number of hops a packet can traverse through the network before it should be discarded
- used to mark the route as unreachable in a routing update that is sent to other routers
Exam with this question: CCNA Exploration 2: ERouting Final Exam
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