Which of the following are CORRECT pairs?

(i) Connection-oriented	(a) TCP
(ii) Connectionless	(b) UDP
(iii) Dotted Decimal Notations	(c) IPv4 Address
(iv) Communication end point	(d) Port 80

The correct answer is Option 3.

Key Points

• The correct pairings are as follows:
  • (i) Connection-oriented: TCP
  • (ii) Connectionless: UDP
  • (iii) Dotted Decimal Notations: IPv4 Address
  • (iv) Communication end point: Port 80
• Here is the reasoning behind these pairings:
  • TCP (Transmission Control Protocol) is a connection-oriented protocol because it establishes a connection before data transmission and ensures reliable delivery.
  • UDP (User Datagram Protocol) is connectionless as it sends data without establishing a connection and does not guarantee delivery.
  • IPv4 Address uses dotted decimal notations (e.g., 192.168.0.1) to represent an address in a human-readable format.
  • Port 80 is a communication endpoint used for HTTP communication in web applications.

Additional Information

• TCP: Provides features like error-checking, data sequencing, and retransmission, making it reliable for applications like web browsing and email.
• UDP: Suitable for applications requiring speed over reliability, such as video streaming and online gaming.
• IPv4 Address: Composed of 4 octets separated by dots, each octet represents an 8-bit binary number.
• Port 80: Default port for HTTP traffic. It is a well-known port used by web servers to listen for incoming requests from clients.
• Understanding these concepts is critical for networking, as they form the foundation for internet communication.