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Ethernet Frame and HTTP Protocol

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Questions and Answers

What is the hexadecimal value for the two-byte Frame type field in the Ethernet frame carrying the HTTP GET request?

0x0002
0x0001
0x0806
0x0800 (correct)

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

46
50
54 (correct)
60

What is the value of the Ethernet source address in the Ethernet frame containing the first byte of the HTTP response message?

The router's Ethernet address
The Ethernet address of a device in the network (correct)
Your computer's Ethernet address
gaia.cs.umass.edu's Ethernet address

What is the destination address in the Ethernet frame?

Your computer's Ethernet address (A) Signup and view all the answers

What device has the Ethernet address mentioned in question 5?

A device in the network (C) Signup and view all the answers

How do students typically answer questions with hand-in assignments?

By printing out specific packets and marking them with a pen (A) Signup and view all the answers

What is the location where the trace file nat-inside-wireshark-trace1-1.pcapng was captured?

LAN side of the router (D) Signup and view all the answers

What is the purpose of analyzing the two HTTP messages (GET and 200 OK)?

To locate these two messages in the trace file nat-outside-wireshark-trace1-1.pcapng (D) Signup and view all the answers

What happens to IP addresses and port numbers in the packets heading towards the server?

They are changed as a result of NAT translation (A) Signup and view all the answers

Why are the time stamps in the two trace files not necessarily synchronized?

Because they are captured on different sides of the router (A) Signup and view all the answers

What is the purpose of capturing packets on the Internet-side link between the router and the ISP?

To locate the HTTP messages (GET and 200 OK) (B) Signup and view all the answers

What is the relationship between the two trace files?

They are captured on different sides of the router (D) Signup and view all the answers

What is the purpose of the ARP cache?

To maintain a list of IP-to-Ethernet address translation pairs (A) Signup and view all the answers

What is the ARP command used for?

To view and manipulate the ARP cache (B) Signup and view all the answers

What is the relationship between the ARP protocol and the arp command?

They have the same name but are different (A) Signup and view all the answers

What is the ARP protocol used for?

To resolve IP addresses to Ethernet addresses (D) Signup and view all the answers

Where is the ARP cache typically stored?

On a local computer (A) Signup and view all the answers

What is the purpose of the ARP protocol in the context of the Wireshark labs?