Networking Protocols and Services Questions

Comprehensive knowledge of common network protocols, services, and related architecture. Candidates should understand the purpose and operation of protocols such as Transmission Control Protocol, User Datagram Protocol, Domain Name System, Dynamic Host Configuration Protocol, Internet Control Message Protocol, Address Resolution Protocol, Hypertext Transfer Protocol and Secure Hypertext Transfer Protocol, File Transfer Protocol, Secure Shell, Simple Network Management Protocol, and Syslog. Expect familiarity with port numbers, protocol layering and suites, reliability versus best effort semantics, flow control and congestion control principles, and how protocols interact across layers. Candidates should be able to explain name resolution flow for the Domain Name System, address assignment flow for the Dynamic Host Configuration Protocol, and diagnostic roles of the Internet Control Message Protocol. Assessment may include load balancing concepts and algorithms, fundamentals of transport security such as Transport Layer Security, network security controls and network policies, service mesh and modern east west traffic patterns, and common troubleshooting and observability techniques for network issues at scale including packet tracing and latency analysis.