Network Models Test With Verified Correct Complete Solutions.

Data-Link Layer Protocols - correct answer PPP ARP OSI Model Definition - correct answer Open Standards Interconnection Model -OSI is and educational tool and is not actually implemented anywhere. -It helps us understand how computers communicate with each other. OSI Model Layers - correct answer 7 layers in total define by the ISO 7498... Application Presentation Session Transport Network Data-link Physical TCP/IP Model - correct answer The standard networking model for most computer networks. This is what the internet actually runs on. OSI Layer 1 - Physical - correct answer -Has to do with the transmission of bits over physical media. -At this layer, data is called a "bit". -Physical media can be copper wire, rf signals, fiber optic, etc. What are some common devices that operate at the Physical Layer? - correct answer -Network Interface Card (NIC) -Wireless NIC's -Concentrators -Repeaters OSI Layer 2 - Data-link - correct answer -Often called the MAC layer. -At this layer, data is called a "frame". -This is where physical addressing happens (link layer addressing or MAC layer addressing). -Each device receives unique address that's used for collision detection LLC - correct answer Link Layer Control -Occurs at the Data-Link Layer (Layer 2) -Governs the sequencing numbers of each frame of data going back and forth. MAC - correct answer Media-Access Control -Governs data transfer and collision handling of frames between devices. OSI Layer 3 - Network - correct answer -This is where logical addressing occurs. -At this layer, data is called a "packet". -Responsible for ROUTING packets from one point to another. Network Layer Protocols - correct answer IP ICMP IPSec What are some common devices that operate at the Data-Link Layer? - correct answer Switches bridges What are some common devices that operate at the Network Layer? - correct answer Routers Layer 3 bridges Layer 3 switches OSI Layer 4 - Transport - correct answer -Responsible for end-to-end communication, flow control, and reliability.