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Module 1: Physical Layer & Data Communication

20217m

Explain in detail about TCP/IP protocol suite with neat diagram.

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TCP/IP Protocol Suite

+-----------------------------------------------------+
|                Application Layer                     |
|   HTTP | FTP | SMTP | DNS | Telnet                    |
+-----------------------------------------------------+
|                Transport Layer                        |
|              TCP            |          UDP             |
+-----------------------------------------------------+
|                 Internet Layer                        |
|          IP  |  ICMP  |  ARP  |  IGMP                  |
+-----------------------------------------------------+
|              Network Access Layer                     |
|      Ethernet | Wi-Fi (802.11) | PPP                   |
+-----------------------------------------------------+

Network Access Layer — combines OSI's Physical and Data Link layers. Handles physical transmission of bits, framing, MAC addressing, and media access control (e.g. CSMA/CD in Ethernet).

Internet Layer — handles logical (IP) addressing and routing. IP is connectionless and best-effort; it doesn't guarantee delivery, order, or error correction on its own. ICMP reports errors (e.g. "destination unreachable"), ARP resolves IP addresses to MAC addresses, and IGMP manages multicast group membership.

Transport Layer — provides process-to-process delivery via port numbers.

  • TCP: connection-oriented (3-way handshake), reliable (ACKs + retransmission), ordered, with flow control (sliding window) and congestion control.
  • UDP: connectionless, no delivery guarantee, minimal overhead — used where speed matters more than reliability (e.g. video streaming, DNS queries).

Application Layer — the layer applications interact with directly. Absorbs OSI's Session and Presentation layer duties (session management, data formatting/encryption). Protocols include HTTP (web), SMTP (email), FTP (file transfer), and DNS (name resolution).

Each layer encapsulates the data from the layer above by prepending its own header, forming: [App data] -> [+TCP hdr] -> [+IP hdr] -> [+Frame hdr] -> bits on wire.

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