Answer Posted / krishnamohan

TCP/IP is suite of protocols; anything related to the
specific protocols of TCP and IP.
- It can include other protocols, applications, and even the
medium
- Sample set of these protocol suite: UDP, ARP, ICMP
- Sample Applications: TELNET, FTP, rcp, SNMP etc
- For FTP application, the flow of data is FTP/TCP/IP/ENET
- For SNMP application, the flow of data is SNMP/UDP/IP/ENET
- Applications using TCP, data passes between application
and TCP module and similarly for UDP, application and UDP module

Flow:
- If an ethernet frame comes up into the ethernet driver off
the network, the packet extracted from the frame is passed
up to IP layer based on the "type" field in the frame header.
Once the IP Layer has the packet, the unit of data is passed
to appropriate protocol in transport layer depending on the
value of "protocol" field in the IP header. The transport
layer passes the data up to the application layer.

Downward multiplexing is simple to perform because from each
starting point there is only one downward path. Data passing
from the applications through either UDP or TCP converges on
the IP module and is sent out through the NIC driver.

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