Computer Networks

Computer Networks II
Homework-1
Due date: Friday 28/10/2022
Total marks: 20
Fig. 1
Let’s consider the above IPv4 packet (in Fig. 1) and its various fields. Please answer the
following questions.
1. Within the IP packet header, what is the value in the upper layer protocol field?
2. How many bytes are in the IP header? How many bytes are in the payload of the IP
datagram? Explain how you determined the number of payload bytes.
3. Has this IP datagram been fragmented? Explain how you determined whether or not
the datagram has been fragmented.
4. What is the value in the Identification field and the TTL field?

Fig. 2
Let’s concentrate on the above packet fields (in Fig. 2).
5. Can you say whether the message corresponding to the above packet has been
fragmented?
6. What information in the IP header indicates that the datagram been fragmented?
7. What information in the IP header indicates whether this is the first fragment versus a
latter fragment?

Fig. 3
Let’s concentrate on the above packet fields (in Fig. 3).
8. What information in the IP header indicates that this is not the first datagram
fragment?
9. Are the more fragments? How can you tell?
10. If Fig. 2 and Fig. 3 are the 1
st and 2nd fragments of a message, then what fields change
in the IP header between the first and second fragment?

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