How data flow from source to destination please Explain each
step from layer to layer?
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Answer Posted / arunanshu tripathy
App. Layer- Someone wants to access CISCO.com the PC
(10.1.1.5) 1st sends a request to the DNS Server which
transforms the cisco.com to an IP address 200.1.1.1. Now the
PC knows that it needs to go to which IP address.
Presentation Layer- The PC then requests the page to be
displayed in HTTP format. This request is packaged into a
GENERIC Format, HTTP.
Session Layer- The Session Layer which understands that
there is a specific request for cisco.com. So, it separates
it and creates its own session so that it does not get
confused with all the other data coming in for other
requests. This ensures delivery to the correct source.
The Transport Layer- It does 2 things
- Chooses b/w reliable(TCP) and unreliable(UDP).
- Configures the Port No. for HTTP i.e. 80 for the
Destination Server to understand. Source Port is assigned a
Dynamic Source Port Number by the PC
HTTP uses TCP.
Network Layer- Adds the IP address at the Source & Dest. IP
addresses.
At Data Link Layer- Adds the H/W address i.e.the Sourc &
Dest. MAC addresses.
At Phy. Layer- the Ethernet Frames used for transportation.
The same reverse thing happens when it reaches the source
bottoms up.
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