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374 Lab 5.pdf


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6. What is the destination address in the Ethernet frame? Is this the Ethernet address of
your computer? 78:31:c1:c7:5d:7e, yes. (Fig. 2)
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? 0x0800 (Fig. 2)
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? (4f 4b) It appears 79
bytes after the start of the Ethernet frame. There are again 14 bytes of Ethernet header, 20
bytes of IP header, and 32 bytes of TCP header followed by 13 more bytes of the HTTP
message before OK is encountered. (Fig. 2)

Fig. 2

2. ARP
9. Write down the contents of your computer’s ARP cache. Please provide your
snapshots of the arp command result. What is the meaning of each column value?
Emmas-MacBook-Pro:sbin EmmaBryce$ arp -a
? (172.30.64.1) at 44:f4:77:2b:28:f0 on en0 ifscope [ethernet]
? (172.30.86.77) at 6c:88:14:29:61:ec on en0 ifscope [ethernet]

The first column is the IP address followed by the MAC address (e.g. 6c:88:14:29:61:ec), and
then en0 is the interface.

Fig. 3