Lab 3 Wireshark Ethernet_ARP Submitted by Amir Sohel

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St. Francis College *

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Jun 8, 2024

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Lab 3: Wireshark: Ethernet_ARP Amir Sohel IT Management, St Francis College IT-6003: Computer Networks and Security Professor Jones April 9, 2024 1
1. What is the 48-bit Ethernet address of your computer? Ans: The Ethernet address of my computer is (9c:fc:e8:0e:d5:a3) 2. What is the 48-bit destination address in the Ethernet frame? Is this the Ethernet address of gaia.cs.umass.edu? (Hint: the answer is no). What device has this as its Ethernet address? [Note: this is an important question, and one that students sometimes get wrong. Re-read pages 468-469 in the text and make sure you understand the answer here.] Ans: The destination address (1c:57:3e:44:db:7f)is not the Ethernet address of gaia.cs.umass.edu. It is the address of my AlticeLabs router, which is the link used to get 2
off the subnet. 3. Give the hexadecimal value for the two-byte Frame type field. What upper layer protocol does this correspond to? Ans: The hex value for the Frame type field is 0x0800. This corresponds to the IP protocol (the frame type filed indicates that the nest layer above IP – the layer to which 3
the payload of ths Ethernet frame will be passed – is IP. 4. How many bytes from the very start of the Ethernet frame does the ASCII “G” in “GET” appear in the Ethernet frame? Ans: After 432 bits or 54 bytes the G in get appears. 14 bytes Ethernet frame 20 bytes IP header 20 bytes TCP header 4
5. What is the value of the Ethernet source address? Is this the address of your computer, or of gaia.cs.umass.edu (Hint: the answer is no). What device has this as its Ethernet address? Ans: There is no hexadecimal value for crc in the Ethernet frame. The source address (9c:fc:e8:0e:d5:a3) is neither the Ethernet address of gaia.cs.umass.edu nor the address of my computer. It is the address of my AlticeLabs router, which is the link used to get onto my subnet. 6. What is the destination address in the Ethernet frame? Is this the Ethernet address of your computer? Ans: The destination address (1c:57:3e:44:db:7f) is the address of my computer. 7. Give the hexadecimal value for the two-byte Frame type field. What upper layer protocol does this correspond to? Ans: The hex value for the Frame type field is 0x0800. This value corresponds to the IP protocol (see also answer to 3. above). 8. How many bytes from the very start of the Ethernet frame does the ASCII “O” in “OK” (i.e., the HTTP response code) appear in the Ethernet frame? Ans: The “O” in the “OK” starts after 104 bits or 13 bytes. 5
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