What is the purpose of the TTL field in the IP header?
- used to mark routes as unreachable in updates sent to other routers
- prevents regular update messages from reinstating a route that may have gone bad
- prevents a router from advertising a network through the interface from which the update came
- limits the time or hops that a packet can traverse through the network before it should be discarded
- defines a maximum metric value for each distance vector routing protocol by setting a maximum hop count
Exam with this question: CCNA Exploration 2: ERouting Chapter 4 Exam Answers
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