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Zorluk: KolayEncapsulation and De-encapsulation

A host receives an incoming data frame on its network interface card (NIC) and processes it up the protocol stack toward the destination application. Which of the following operations occur during this host de-encapsulation process? (Select TWO.)

  1. The Data Link layer verifies the frame checksum and removes the Layer 2 header and trailer to expose the IP packet.Cevap
  2. The Transport layer reads the Layer 4 header port numbers to route the payload to the designated application.Cevap
  3. C
    The Network layer appends a new source and destination MAC address to the packet before sending it to the Transport layer.
  4. D
    The Physical layer evaluates TCP port numbers to strip Layer 4 encapsulation headers directly from incoming electrical signals.

Cevap

During host de-encapsulation, the Data Link layer verifies the frame checksum and strips the Layer 2 header/trailer to expose the IP packet, and the Transport layer inspects the Layer 4 port numbers to deliver the payload to the correct application.
De-encapsulation on a receiving host proceeds from Layer 1 up to Layer 7. At Layer 2 (Data Link), the frame header and trailer are validated and stripped to reveal the IP packet. Once the Network layer processes and removes the IP header, the Transport layer (Layer 4) reads the TCP/UDP port numbers to deliver the raw payload to the target application.

Adım Adım Çözüm

1
Analyze Layer 2 processing during inbound de-encapsulation.
The Data Link layer checks the frame checksum (FCS), verifies local MAC destination address, and strips the Ethernet header and trailer.
De-encapsulation unwraps protocol data units starting from the lowest layer up to higher layers.
2
Analyze Layer 3 processing during inbound de-encapsulation.
The Network layer verifies IP addresses, strips the IP header, and passes the upper protocol payload to Layer 4.
Layer 3 delivers the packet to the destination host and removes IP header overhead.
3
Analyze Layer 4 processing during inbound de-encapsulation.
The Transport layer evaluates destination port numbers in the header to direct the data payload to the receiving application process.
Port numbers identify specific software applications or services waiting for incoming traffic.

Anahtar Kavram

De-encapsulation host protocol unwrapping
Tahmini Süre:45s
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Konular

Encapsulation and De-encapsulation

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