Computer Networks:

Using the wireshark trace and answer the following questions:

Number of packets sent: 10 Number of packets received: 6 Packet loss rate is:40 % Maximum RTT is:4.1 seconds Minimum RTT is:3.1 seconds Average RTT is:3.9 seconds

1. What packet numbers correspond to ping requests? _______________________________

2. What packet numbers correspond to ping responses? ______________________________

3. How many ping requests were lost (no response from server)?______________________

4. What is the loss rate of ping requests (%)?________________________________________

5. What is the IP address of the client? Which header includes this address in a packet? (2) __________________________________________________________________________

6. What is the IP address of the server? Which header includes this address in a packet? (2) __________________________________________________________________________

7. What port is the client listening on? Which header includes this port in a packet? (2) __________________________________________________________________________

8. What port is the server listening on? Which header includes this port in a packet? (2) __________________________________________________________________________

9. In your program, where is the port number that the client listens on specified? _____________________________________________________________________

10. In your program, where is the port number that the server listens on specified? _____________________________________________________________________

11. What protocol in the protocol stack is responsible for forwarding a packet from a source host to a destination host?__________________________________________________

12. What protocol in the protocol stack is responsible for multiplexing and de-multiplexing ping packets to and from the application processes?___________________________________

13. What application data does the ping client send to the server and what is its length in bytes? (2) _____________________________________________________________________

14. What application data does the ping server send to the client and what is its length in bytes? (2) _____________________________________________________________________

15. How much overhead (in bytes) does the network stack (link layer, network layer and transport layer) in the operating system add to each ping packet? (3) ____________________________________________________________________

16. Network protocols format messages using network byte order. Explain network byte order and why is it used? (2) ______________________________________________________________________________________________________________________________________________________ ___________________________________________________________________________

Apply a display filter No. C:Windows py.exe The seruer is ready to receive on port 12000 Responding to ping request with sequence number 1 Message with sequence number 1 dropped Responding to ping request with sequence number 2 Responding to ping request with sequence number 3 Responding to ping request with sequence number 4 Message with sequence number 4 dropped Responding to ping request With sequence number 5 Responding to ping request with sequence number 6 Message with sequence number 6 dropped Responding to ping request With sequence number? Responding to ping request with sequence number 8 Message with sequence number 8 dropped Responding to ping request with sequence number Message with sequence number 9 dropped Responding to ping request with sequence number 10 Len=1 Len=1 Len-1 Len=1 Len=1 Len=1 Len=1 Len=1 Len=1 Len=1 Len=1 Len=1 Len=1 Len-2 Len=2 cCtr Protocol Length 187 12.673724 127.0.0.1 232 13.678089 127.8.0.1 233 13.678325 127.0.0.1 234 13.678581 127.8.8.1 235 13.678734 127.0.0.1 236 13.678946 127.8.8.1 237 14.692574 127.0.0.1 238 14.693866 127.8.0.1 239 14.694222 127.0.0.1 248 15.786566 127.8.0.1 241 15.707341 127.0.0.1 242 15.788454 127.8.0.1 243 16.720449 127.0.0.1 2217.73424 127.0.0.1 283 17.735061 127.0.0.1 127 ..8.1 127.e.8.1 127 ..8.1 127.0.8.1 127 ..8.1 127.0.8.1 127.0.0.1 127.8.8.1 127.0.8.1 127.0.8.1 127.0.8.1 127.8.8.1 127.0.8.1 127.0.8.1 127.0.0.1 62 53218 12000 Len-1 62 53218 12000 Len=1 62 12800 53218 Len-1 62 53218 12000 Len=1 62 12800 53218 Len-1 62 53218 12000 Len=1 62 53218 12000 Len-1 62 12000 5321 Len: 1 62 53218 12000 Len=1 62 53218 12000 Len=1 62 1280053218 Len-1 62 53218 12000 Len=1 62 53218 12000 Len=1 64 53218 12000 Len=2 64 12000 53218 Len:2