Question 1

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

c4:41:1e:75:b1:52

Question 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?

• 48-bit destination (Ethernet) address: 00:1e:c1:7e:d9:01.
• Is this Gaia’s MAC? No. Gaia (IP 128.119.245.12) is off-LAN, so my NIC sent the frame to the next hop of my LAN.
• Whose MAC is it? It’s my default gateway/router on the local network, IP 128.119.247.1 (confirmed by the ARP reply mapping 128.119.247 -> 00:1e:c1:7e:d9:01).