What mechanisms does TCP use to ensure reliable data delivery, and how do they impact performance?
Why is UDP preferred for real-time applications like VoIP, and what are its limitations?
How does the hierarchical structure of DNS improve scalability, and what happens if a root server fails?
What information is included in an HTTP GET request header, and how does the server use it?
Explain how port numbers enable multiplexing in TCP and UDP, and provide an example application for each.
Answers and Descriptions for Group 5
Answer: TCP uses acknowledgments, retransmissions, sequence numbers, and flow control. These ensure reliability but increaseburgo increase latency due to overhead, unlike UDP’s faster but unreliable delivery.
Description: TCP’s reliability is vital for applications like email. Analyzing its mechanisms helps students evaluate trade-offs between reliability and speed, optimizing protocol choices.Answer: UDP’s low overhead and connectionless nature ensure low latency, ideal for VoIP. Limitations include no error correction or retransmission, risking packet loss.
Description: UDP suits time-sensitive applications but requires application-layer error handling. Students learn to match protocols to application needs, enhancing design skills.Answer: DNS’s hierarchy (root, TLD, authoritative servers) distributes load, enhancing scalability. Root server failure is mitigated by redundant servers and caching, minimizing impact.
Description: DNS’s distributed design ensures global reliability. Analyzing failure scenarios teaches students to design resilient systems, applying concepts to Internet infrastructure.
Answer: Headers include method (GET), URL, host, user-agent, and accept types. The server uses this to identify the resource, client capabilities, and response format.
Description: Header analysis reveals client-server communication details. Students learn to troubleshoot web issues by examining HTTP interactions, applying knowledge to web development.Answer: Port numbers identify application processes, enabling multiplexing so multiple applications share one IP address. Example: TCP port 80 (HTTP), UDP port 53 (DNS).
Description: Multiplexing supports concurrent communications. Understanding port numbers helps students analyze application-layer protocols, preparing them for network configuration.