Computer A wants to send some data to computer B. Computer A knows that Computer B is not on its local network, so it sends the packet to the router between Network A and Network B. Based on how many network hops have happened, how much will the TTL field be decremented by?
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Answer:
Computer A does NOT need to know where Computer B is. The router uses it’s subnet mask to determine if the target is is the local network or out on the LAN.
The TTL field is decremented by 1.
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The TTL field will be decremented by 1 in the given case.
- The TTL gets decremented by 1 each time it crosses a router (which is a layer 3 device) as the TTL field is located in the IP header.
- To determine if the target is in or out of the LAN, the router uses its subnet mask.
- So, it only gets decremented by 1 if there is only 1 router between A and B.
∴ We can say that the TTL field will be decremented by 1.
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