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Zorluk: OrtaEncapsulation and De-encapsulation

A network host receives an incoming Ethernet frame containing an IP packet directed to a local service. Which TWO of the following actions correctly describe the de-encapsulation steps performed as data moves up the destination protocol stack?

  1. The Network Interface Card verifies frame integrity using the Frame Check Sequence trailer and strips the Layer 2 header and trailer before passing the payload to the Network layer.Cevap
  2. The Network layer examines the Protocol field in the IP header to identify the appropriate Layer 4 protocol to receive the decapsulated payload.Cevap
  3. C
    The Data Link layer reads the Layer 4 destination port number to determine which VLAN interface should process the incoming frame payload.
  4. D
    The Network layer checks the destination port number to route the packet payload directly to the correct listening application service.

Cevap

The Network Interface Card verifies frame integrity using the Frame Check Sequence trailer and strips the Layer 2 header and trailer before passing the payload to the Network layer, and the Network layer examines the Protocol field in the IP header to identify the appropriate Layer 4 protocol to receive the decapsulated payload.
During de-encapsulation, each layer inspects and removes its corresponding header or trailer before passing the remaining payload to the layer above. At Layer 2, frame integrity is verified using the Frame Check Sequence (FCS), after which the Layer 2 header and trailer are removed. At Layer 3, the Network layer inspects the Protocol field within the IP header to determine which Transport layer protocol (such as TCP or UDP) receives the payload.

Adım Adım Çözüm

1
Analyze Layer 2 frame processing and de-encapsulation
The host physical interface receives incoming signals, builds the frame, verifies checksum integrity using the Frame Check Sequence (FCS) in the trailer, and strips the Ethernet header and trailer.
De-encapsulation progresses from lower layers to higher layers, with each layer removing its respective control headers and trailers.
2
Analyze Layer 3 header evaluation and protocol demultiplexing
The Network layer receives the IP packet, verifies target logical addressing, and inspects the IP header Protocol field to pass the payload to the appropriate Layer 4 handler (such as TCP or UDP).
The Protocol field in the IP header specifies the upper-layer protocol driver that must process the enclosed payload.

Anahtar Kavram

De-encapsulation protocol stack unwrapping and header field demultiplexing
Tahmini Süre:1m 30s
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Konular

Encapsulation and De-encapsulation

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