WHAT IS THE PURPOSE OF THE TTL FIELD WITHIN AN IP PACKET HEADER
25. 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