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Zorluk: OrtaOSI Model Layers and Functions

During a network security configuration task, a technician implements packet-filtering rules on a gateway router to inspect incoming traffic based on source and destination IP addresses and forward traffic between separate subnets. At which OSI model layer does this IP addressing and routing function take place, and what is the associated Protocol Data Unit (PDU)?

  1. Network Layer (Layer 3) processing packetsCevap
  2. B
    Data Link Layer (Layer 2) processing frames
  3. C
    Transport Layer (Layer 4) processing segments
  4. D
    Application Layer (Layer 7) processing data

Cevap

Network Layer (Layer 3) processing packets
The Network Layer (Layer 3) is responsible for logical addressing (IPv4/IPv6), packet forwarding, and path selection (routing) between different networks. The Protocol Data Unit (PDU) created and processed at Layer 3 is the packet.

Adım Adım Çözüm

1
Identify the primary function described in the scenario.
The scenario describes examining source/destination IP addresses and routing traffic between different subnets.
Logical addressing (IP addresses) and path determination (routing) across subnets are core responsibilities of the Network Layer.
2
Determine the Protocol Data Unit (PDU) at this layer.
The PDU at the Network Layer is the packet.
Data encapsulated with Layer 3 headers containing source and destination IP addresses is defined as a packet.

Anahtar Kavram

OSI Network Layer Functions and PDUs
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Konular

OSI Model Layers and Functions

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