Explain how CSMA/CD prevents collisions in Ethernet and its limitations in modern networks.
What are the key fields in an Ethernet frame, and how do they support reliable communication?
For a network with IP block 192.168.1.0/24, calculate subnet masks for 4 subnets and list the IP address ranges.
How does IPv6 address the scarcity of IPv4 addresses, and what additional benefits does it offer?
Why is packet switching more efficient than circuit switching for Internet communication?.
Answers and Descriptions for Group 4
Answer: CSMA/CD senses the medium, waits if busy, and detects collisions during transmission, retrying after a random backoff. It’s less relevant in switched networks with full-duplex links.
Description: CSMA/CD was critical for early Ethernet. Understanding its mechanics and obsolescence in full-duplex environments teaches students about protocol evolution and modern network efficiency.
Answer: Fields include destination/source MAC addresses, payload, type/length, and CRC. MAC addresses ensure delivery, type/length defines data, and CRC detects errors.
Description: Frame structure analysis reveals protocol functionality. Students learn to evaluate data integrity and addressing, preparing them for advanced protocol design and troubleshooting.Answer: Subnet mask = /26 (6 host bits, 64 addresses each). Ranges:
- 192.168.1.0–192.168.1.63
- 192.168.1.64–192.168.1.127
- 192.168.1.128–192.168.1.191
192.168.1.192–192.168.1.255
Description: Subnetting optimizes IP allocation. Calculating masks and ranges teaches students to design efficient address schemes, critical for scalable enterprise networks.
Answer: IPv6 uses 128-bit addresses, vastly increasing capacity. Benefits include simplified headers, auto-configuration, and native security (IPsec).
Description: IPv6 supports IoT and future networks. Analyzing its advantages prepares students for transitioning to next-generation protocols, addressing real-world scalability issues.Answer: Packet switching breaks data into packets, routed independently, sharing bandwidth dynamically, unlike circuit switching’s dedicated paths, which waste resources when idle.
Description: Packet switching underpins Internet scalability. Comparing switching methods helps students understand network efficiency, applying concepts to modern data transmission systems