CNIT 240/344 FINAL EXAM ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS

CNIT 240/344 FINAL EXAM ACTUAL 2025/2026 QUESTIONS AND 100% CORRECT ANSWERS Open System Interconnection (OSI) 7 layers for open interconnection between any two systems regardless of vendor OSI rules layers can only communicate with adjacent layers OSI benefits break network communication into more manageable parts and vendor agnostic OSI layersPhysical, Data Link, Network, Transport, Session, Presentation, Application Physical layer Transmission of bit stream; focus on signaling techniques; does NOT include physical media Data link layer Manages frames for error-free data transfer point-to-point; CRC integrity checking Data link layer sub-layers MAC; LLC Network layerenables internetworking; unique addressing for every node, determines routes; unreliable for error detection and correction; packets(reliable)/datagrams); routable (IP) and routing protocols Transport layer host-to-host integrity of transmission; detect damaged or lost packets; messages/segments Session layer host-to-host interactive sessions; sockets (port + address) Presentation layer managing data presentation; encryption; character conversion Application layer interface between user applications and network's services via APIs; HTTP; SSH