Ian Reese
Lab 5: Sniffing with Wireshark

Objectives: Track packets as they are sent using wireshark to learn about how they are transferred.

Notes and Observations:

Browsing a webpage on a server outside of campus:

1 browsingweb

File transfer on FTP server:

2 ftp

Testing connection with a ping:

5 download

Acquiring a network address with DHCP:

4 dhcp

Downloading a font file from dafont.com:

3 ping

Questions:

1. What is the purpose of sequence numbers?

– So they can be reassembled in the way they were transmitted.

2. What is the purpose of source and destination addresses?

– So the devices that are used to send the packets know who information is from and where it goes.

3. What is the purpose of DNS?

– So that users can type in a hostname and it can be translated into the meaningful IP address that the hardware uses to address information.

4. What is DHCP?

– Dynamic Host Configuration Protocol is a protocol used to configure devices connected to a network so they can communicate on an IP network.

5. What is the relationship between the OSI model of networking and what you saw in this lab activity?

6. What evidence of layered network design did you discover when examining captured data? How does the wireshark data demonstrate encapsulation?

7. What are the implications of having a tool like wireshark freely available? For network administration? For security?


Conclusions:

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