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Which layer of the OSI model is responsible for logical addressing and routing of data packets?
Data Link Layer
Network Layer
Transport Layer
Session Layer
Network Layer
The Network Layer (Layer 3) of the OSI model is responsible for packet forwarding, logical addressing, and routing. It ensures data reaches its destination by selecting the best physical path through the network using routing algorithms.
ISO/IEC 7498-1:1994 (OSI Basic Reference Model)
The Network Layer (Layer 3) of the OSI model is responsible for packet forwarding, logical addressing, and routing. It ensures data reaches its destination by selecting the best physical path through the network using routing algorithms.
Throughput=Time┬аTakenTotal┬аPackets┬аDeliveredтАЛ
Network┬аDelay=Propagation┬аDelay+Transmission┬аDelay+Queuing┬аDelay+Processing┬аDelay
The Network Layer encapsulates Transport Layer segments into packets. It utilizes logical addressing schemes, such as IPv4 or IPv6, to identify source and destination nodes globally. Routers operate at this layer, maintaining routing tables to determine the next hop for data based on destination addresses.
Logical addressing enables communication across heterogeneous networks.
Routers and Layer-3 switches are the primary devices operating at this layer.
Key protocols include IP, ICMP, ARP (often categorized at layer 2.5), and routing protocols like OSPF and BGP.
Fragmentation and reassembly of packets are performed here to match Maximum Transmission Unit (MTU) limits.
Allows internetworking of different network architectures.
Provides end-to-end global addressing.
Efficient congestion control and path determination.
Increased latency due to header processing and routing decisions.
Complexity in managing large-scale global routing tables.
Routing of Internet traffic.
Building virtual private networks (VPNs).
Data packet filtering using firewalls.
Option A (Data Link Layer) handles physical addressing (MAC addresses) and error detection at the frame level.
Option C (Transport Layer) ensures end-to-end communication, flow control, and error recovery using ports.
Option D (Session Layer) manages dialogue control and synchronization between applications.
B is correct тАФ The Network Layer is the layer designated for logical addressing and routing.
In exams, remember the mnemonic 'All People Seem To Need Data Processing' to recall the order (Application to Physical). For Layer 3, focus on keywords like 'IP addresses', 'Routers', and 'Packets'.