TELECOMMUNICATIONS SYSTEMS
NETWORK ARCHITECTURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Physical
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Data Link
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Network
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Transport
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Detailed explanation-1: -Internet Layer: The Internet layer is equivalent to the Network Layer in the OSI model. This layer is primarily covered by the Internet Protocol (IP), but ARP, IGMP, and ICMP also operate at this layer. Network Access Layer: This layer combines the Physical and Data Link layers from the OSI model.
Detailed explanation-2: -3. Network layer: Handles the routing and sending of data between different networks. The most important protocols at this layer are IP and ICMP.
Detailed explanation-3: -Layer 4 – Transport The best known example of the Transport Layer is the Transmission Control Protocol (TCP), which is built on top of the Internet Protocol (IP), commonly known as TCP/IP. TCP and UDP port numbers work at Layer 4, while IP addresses work at Layer 3, the Network Layer.
Detailed explanation-4: -ICMP messages are encapsulated in IP packets so most people would say that it’s a layer 4 protocol like UDP or TCP. However, since ICMP is a vital part of the IP protocol it is typically considered a layer 3 protocol.