1. Can the value of the header length field in an IPv4 packet be less than 5?
When is it exactly 5?
2. A host is sending 100 datagrams to another host. If the identification number of the first datagram is 1024, what is the identification number of the last?
3. An IP fragment has arrived with an offset value of 100. How many bytes of data were originally sent by the source before the data in this fragment?