Which IPV4 header field increments every time when packet is sent from a source to a destination?
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The IPv4 header field that increments every time a packet is sent from a source to a destination is the "Time to Live" (TTL) field.
The TTL field is a 8-bit field located in the IPv4 header. Its initial value is set by the source host and decremented by one by every router that forwards the packet along the path to its destination. When the TTL field value reaches zero, the packet is discarded and an ICMP Time Exceeded message is sent back to the source host.
The TTL field is used to prevent packets from circulating endlessly in the network. If a packet's TTL value is too low, it may not reach its destination, resulting in poor network performance or connectivity issues. On the other hand, if the TTL value is too high, the packet may cause congestion in the network.
In summary, the "Time to Live" (TTL) field is the IPv4 header field that increments every time a packet is sent from a source to a destination, and it is used to prevent packets from circulating endlessly in the network.