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RELATÓRIO 7 - Ethernet

1. What is the 48-bit Ethernet address of your computer?

R: O endereço é: 14 : 10 : 9f : ec : 5a

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.]

R:

O endereço é: 00 : 1e : c1: 4c : aa :7a. Não, Esse é o endereço de 3comEuro.

3. Give the hexadecimal value for the two-byte Frame type field. What do the bit(s) whose value is 1 mean within the flag field?

R: O valor é 0x0800

4. How many bytes from the very start of the Ethernet frame does the ASCII “G” in “GET” appear in the Ethernet frame?

R: Aparece no 66 byte.

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?

R: O endereço é: 00 : 1e : c1: 4c : aa :7a. O endereço não pertence a nenhum dos dois. Ele pertence ao Link usado a chegar a subnet.

6. What is the destination address in the Ethernet frame? Is this the Ethernet address of your computer?

R: O endereço é: 14 : 10 : 9f : ec : 5a. Sim, esse é o endereço do meu computador.

7. Give the hexadecimal value for the two-byte Frame type field. What do the bit(s) whose value is 1 mean within the flag field?

R: O valor é 0x0800

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?

R: Aparece no 79 byte.

9. Write down the contents of your computer’s ARP cache. What is the meaning of each column value?

R: Em ordem, podemos observer o endereço de IP, o endereço físico (MAC) e o tipo de protocolo.

10. What are the hexadecimal values for the source and destination addresses in the Ethernet frame containing the ARP request message?

11. Give the hexadecimal value for the two-byte Ethernet Frame type field. What do the bit(s) whose value is 1 mean within the flag field?

R: O valor é 0x0806

12. Download the ARP specification from ftp://ftp.rfc-editor.org/in- notes/std/std37.txt. A readable, detailed discussion of ARP is also at http://www.erg.abdn.ac.uk/users/gorry/course/inet-pages/arp.html

a) How many bytes from the very beginning of the Ethernet frame does the ARP opcode field begin?

R: