Please help me and answer these questions in computer networks. Thank you! 19.5.

Question

Please help me and answer these questions in computer networks. Thank you! 19.5.2 Questions Q19-1. Can the value of the header length field in an IPv4 packet be less than When is it exactly 5? Q19-2. A host is sending 100 d to another host. If the identification number of the first datagram is 1024, what is the identification number of the last? Q19-3. 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? Q19-4. Mention the three auxiliary protocols at the network layer of the TcPIP suite that are designed to help the IPv4 protocol. Q19-5. In an IPv4 datagram, the value of the header-length (HLEN) field is (616 How many bytes of options have been added to the packet? Q19-6, Can each of the following be the value of the TTL in a datagram? Explain your answer. b. 0 a, 23 d. 301 Q19-7. Compare and contrast the protocol field at the network layer with the port numbers at the transport layer. What is their common purpose? Why do we need two port-number fields but only one protocol field? Why is the size of the protocol field only half the size of each port number? Q19-8. Which field (s) in the datagram is (are) responsible for gluing together all frag- ments belonging to an original datagram? Q19-9. Can each of the following be the value of the offset field in a datagram? Explain your answer. id, 56 c, 73 b, 31

Explanation / Answer

19.1 No, hearder fields minimum value is 5

this field specifies the size of the header, The minimum value for this field is 5, which indicates a length of 5 × 32 bits = 160 bits = 20 bytes.

19.2

Identification number is usually incremented by 1 for the following packets.

So first packet = 1024

Last packet = 1024+100=1124

19.3:

Fragment field specifies the position of the fragment in the original datagram in multiples of 8 bytes

So, 100*8 = 800 bytes were originally sent before current datagram

19.4:

Three protocols are network layer of TCP/IP suite are:

1. IP Protocol

2. ARP protocol: Address Resolution Protocol

3. ICMP protocol:  Internet Control Message Protocol

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