How is public key cryptography used in HTTPS, and what ensures the authenticity of a website’s public key?
Design a strategy to protect users from phishing attacks in a corporate network, including technical and educational measures.
Compare DSL and ADSL in terms of bandwidth allocation and suitability for home networks.
Explain how NAT overload handles multiple devices in a home LAN and what happens if too many connections are active.
How might emerging technologies like 5G fixed wireless access replace traditional ISP connections for home networks?
Answers
Answer: HTTPS uses public keys to encrypt data and private keys to decrypt. Certificate Authorities (CAs) issue digital certificates to verify a website’s public key authenticity.
Description: HTTPS secures web communication. Understanding certificate validation teaches students to implement secure protocols, protecting against man-in-the-middle attacks.Answer: Use email filters, two-factor authentication, and firewalls. Educate users on recognizing suspicious links and verifying sender authenticity. Regular training reinforces awareness.
Description: Phishing is a prevalent threat. Designing comprehensive strategies teaches students to combine technical and human defenses, enhancing corporate network security.Answer: DSL provides symmetric bandwidth, suitable for balanced upload/download needs. ADSL allocates more bandwidth for downloads, ideal for home Internet usage like streaming.
Description: ADSL’s asymmetry matches consumer patterns. Comparing DSL variants helps students select appropriate technologies for home networks, optimizing user experience.Answer: NAT overload maps multiple private IPs to one public IP using port numbers. Excessive connections cause port exhaustion, leading to dropped connections or delays.
Description: NAT overload is common in home routers. Analyzing overload scenarios teaches students to manage network resources, preparing them for practical troubleshooting.
Answer: 5G offers high-speed, low-latency wireless access, eliminating wired infrastructure needs. It supports IoT and high-bandwidth applications but requires reliable coverage.
Description: 5G represents the future of connectivity. Evaluating its potential helps students anticipate technological shifts, preparing them for innovative network designs.