LAB # 2:To analyse (C4) and explain (P2) the syntax and semantics of
Application Layer Service and Protocols using Wireshark
Topics:
To familiarize with the introduction of protocols and syntac of
Application layer using Wireshark.In this lab we will familiarize with
the following things:
 To analyse (C4) and show (P2) the contents captured in Wireshark related
to HTTP, SMTP,POP and DNS.
 To show (P2) the network transactions between clients and DNS
server using Wireshark.
Tools:
 Wireshark
Conclusion:
In this lab we will came to know about the Packet sniffer, a packet sniffer captures
(“sniffs”) messages being
sent/received from/by your computer; it will also typically store and/or display the
contents of the various protocol fields in these captured messages. A packet sniffer
itself is passive. It observes messages being sent and received by applications and
protocols running on your computer, but never sends packets itself. Similarly,
received packets are never explicitly addressed to the packet sniffer.We also came
to know about the packet analyser, which displays the contents of all fields within
a protocol message. In order to do so, the packet analyser must “understand” the
structure of all messages exchanged by protocols.
We also came to know about the introduction of wireshark that how to run and
how to use it and how to check different values.We also came to know about how
to capture and analyse packets using wireshark.