Heroes of Packet Analysis Quiz

Enter the competition and match your skills to those of the Packet Analysis Heroes! Answer all questions correctly for a chance to win a $500 Amazon Gift Card.

Navigate through the questions by clicking on the numbers below.

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14: When troubleshooting this issue, what is most likely to be causing the problem at the Osaka site? Choose one answer.

Question Background:

A company has two offices in Tokyo and Osaka, both using the same router to connect to the internet via FTTH. Osaka staff says they cannot connect to Yahoo though they can see Google. So the IT team tests and captures both LAN and WAN packets at each site.

Download Osaka Fail LAN pcap file › 
Download Osaka Fail WAN pcap file › 
Download Tokyo Success LAN pcap file › 
Download Tokyo Success WAN pcap file ›

Click on the image to zoom in.

Click on the image to zoom in.

Click on the image to zoom in.

Click on the image to zoom in.

A. Osaka router does not set the same value of IP checksum in routing.
B. Source IP address at Osaka’s WAN side was different from the Osaka’s LAN side, so remote server could not reply correctly.
C. Maximum Segment Size in TCP options is not changed during OSAKA router’s NAPT (Network Address and Port Translation) process.
D. Web service of remote server was down.

The correct answer was…

C. Maximum Segment Size in TCP options is not changed during OSAKA router’s NAPT (Network Address and Port Translation) process.

 

The contest is closed, so we won’t be taking into account any more answers.

 

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Who asked the question:

Megumi Takeshita

Founder Ikeriri Network Service

Megumi Takeshita, known as Packet Otaku, runs a packet analysis company after having worked as a network analyst at BayNetworks and Nortel Networks for many years. Ikeriri Network Service is a reseller of Riverbed, Metageek, Profitap and other packet capture products in Japan.

Megumi has written more than 10 books about packet analysis and deep inspection using Wireshark in Japanese.

Read her Review › ProfiShark Long-Term Traffic Capture

Answer all questions correctly for a chance to win a $500 Amazon Gift Card.

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