Lab6-IP

  • Due Apr 26 at 11:59pm
  • Points 32
  • Questions 16
  • Available Apr 19 at 10:40am - Apr 29 at 11:59pm 11 days
  • Time Limit None
  • Allowed Attempts 4
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Attempt History

Attempt Time Score
KEPT Attempt 2 2 minutes 32 out of 32
LATEST Attempt 2 2 minutes 32 out of 32
Attempt 1 20 minutes 24 out of 32
Correct answers are hidden.
Score for this attempt: 32 out of 32
Submitted Apr 24 at 11:16pm
This attempt took 2 minutes.
 
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Question 1
2 / 2 pts
0 short_answer_question   6128347

IP-1 Lab: Q01 Introduction and getting started.

You might need to read Wireshark IP lab manual before answering these questions.

The answers to the following questions are based on packets in the trace file ip-wireshark-trace1-1.pcapng file that are posted under Modules/Labs. 

 

IP-1 Lab: Q01.1 Introduction and Getting Started. What is the IP address of the client computer (source) that is initiating the traceroute to gaia.cs.umass.edu?

Enter the IP address in dotted decimal notation (include each dot, and omit any leading zeros for any byte, e.g., 10.1.216.54):

Nice! This answer is correct.

 
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Question 2
2 / 2 pts
false 0 short_answer_question   6128348

IP-1 Lab: Q02 The TTL field.  What is the value in the time-to-live (TTL) field in the header of this IPv4 datagram (i.e., the datagram containing the first UDP segment sent from client to gaia.cs.umass.edu server)?

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Question 3
2 / 2 pts
false 0 short_answer_question   6128349

IP-1 Lab: Q03 The upper-layer protocol field.  What is the value in the upper-layer protocol field in the header of this IPv4 datagram (i.e., the datagram containing the first UDP segment sent from client to gaia.cs.umass.edu)?

Enter the upper-layer protocol field value (digits only, no commas), with no leading 0's:

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Question 4
2 / 2 pts
false 0 short_answer_question   6128350

IP-1 Lab: Q04. How large is the IP header?  How many bytes are in the header of this IPv4 datagram (i.e.,  the number of bytes, excluding the payload, in the datagram containing the first UDP segment sent from client to gaia.cs.umass.edu)?

Enter the number of bytes (digits only, no commas), with no leading 0's:

Nice! This answer is correct.

 
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Question 5
2 / 2 pts
0 multiple_choice_question   6128351

IP-1 Lab: Q05 How many payload bytes? How many bytes of payload are in this datagram, and how did you determine this? Choose one of the following answers.

 

 
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exact_answer none 3376361 36001

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Question 6
2 / 2 pts
0 multiple_choice_question   6128352

IP-1 Lab: Q06. Is there fragmentation? Has this IP datagram been fragmented? Explain how you determined whether or not the datagram has been fragmented. Choose one of the following answers.

 
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exact_answer none 3376362 91024

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Question 7
2 / 2 pts
0 multiple_answers_question   6128353

IP-1 Lab: Q07 Which Fields Change?  Next, let’s look at the sequence of UDP segments being sent  to 128.119.245.12. The display filter that you can enter to do this is “ip.src==192.168.86.61 and ip.dst==128.119.245.12 and udp and !icmp” (use this display filter for questions 7 - 9).  Which fields in the IP datagram always change from one datagram to the next within this series of UDP segments? 

 
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Question 8
2 / 2 pts
0 multiple_answers_question   6128354

IP-1 Lab: Q08 Which Fields Stay Constant?  Which fields in this sequence of IP datagrams (containing UDP segments) stay constant?

 
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Question 9
2 / 2 pts
0 multiple_choice_question   6128355

IP-1 Lab: Q09 A pattern in the Identification fields. What is the pattern you see in the values of the Identification field of the IP datagrams  ? (Hint: take a look at the identification field values in ascending packet order from packet 44 to packet 71)

 
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exact_answer none 3376365 64489

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Question 10
2 / 2 pts
false 0 short_answer_question   6128356

IP-1 Lab: Q10 What is Upper Layer Protocol? What is the value upper layer protocol specified in the IP datagrams returned from the routers? Hint: Use the following display filter: “ip.dst==192.168.86.61 and icmp” for questions 10-12. 

 

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Question 11
2 / 2 pts
0 multiple_choice_question   6128370

IP-1 Lab: Q11 Identification Fields Pattern? Are the values in the Identification fields (across the sequence of all of ICMP packets from all of the routers) similar in behavior to your answer to question 9 above?

 

 
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exact_answer none 3376367 61893

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Question 12
2 / 2 pts
0 multiple_choice_question   6128371

IP-1 Lab: Q12 TTL Field Pattern? Are the values in the TTL fields similar across all of the ICMP packets from all of the routers?

 

 

 
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exact_answer none 3376368 50143

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Question 13
2 / 2 pts
0 multiple_choice_question   6128372

 

IP-1 Lab: Q13 Is there Fragmentation?  Get rid of any display filters and sort the packets by time by clicking the time column (use this for questions 13-19). Find the first IP datagram (Hint: This is packet 179 in the ip-wireshark-trace1-1.pcapng trace file. This is the IP datagram that we will be analyzing in questions 13-16). Has this segment been fragmented across more than one IP datagram?

 

 

 
exact_answer none 3376369 97869
 
exact_answer none 3376369 66180

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Question 14
2 / 2 pts
0 multiple_choice_question   6128357

IP-1 Lab: Q14 What information indicates fragmentation?  What information in the IP header indicates that this datagram been fragmented?   

 

 
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exact_answer none 3376370 56659

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Question 15
2 / 2 pts
0 multiple_choice_question   6128358

IP-1 Lab: Q15 What information indicates a first or a latter fragment?  What information in the IP header indicates that this datagram is the first fragment versus a latter fragment?

  

 
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exact_answer none 3376371 42849

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Question 16
2 / 2 pts
false 0 short_answer_question   6128359

IP-1 Lab: Q16 How many bytes in IP datagram? How many bytes are there in this IP datagram (header plus payload)? Enter your answer as an integer with no leading zeros:

Nice! This answer is correct.

Quiz Score: 32 out of 32