Question $6$

Computer $1$ on Network A sends a packet to Computer $2$ on Network C$.$ What's the last step that Router Z does after receiving the Ethernet frame?

$1$ point

Decrements the TTL by $1,$ calculates a new checksum, and makes a new IP datagram. This new IP datagram is again encapsulated on a new Ethernet frame.

Sends back the packages to router Y for confirmation

Calculates a checksum and compares this checksum with the one in the Ethernet frame header

Strips away the Ethernet frame, leaving the IP datagram. Performs a checksum calculation against the entire datagram