A secure web server receiving an HTTPS request on TCP port 443 processes the inbound netwo… — CompTIA Network+

A secure web server receiving an HTTPS request on TCP port 443 processes the inbound network signal from its network interface card up to the web application process. As de-encapsulation occurs, which sequence correctly identifies the order of Protocol Data Units (PDUs) processed and the corresponding headers or trailers removed at each layer of the protocol stack?

Frame (Ethernet header and trailer removed) $\rightarrow$ Packet (IP header removed) $\rightarrow$ Segment (TCP header removed) $\rightarrow$ Data payload delivered to the applicationCevap
B
Packet (IP header removed) $\rightarrow$ Frame (Ethernet header and trailer removed) $\rightarrow$ Segment (TCP header removed) $\rightarrow$ Data payload delivered to the application
C
Frame (Ethernet header and trailer removed) $\rightarrow$ Datagram (UDP header removed) $\rightarrow$ Packet (IP header removed) $\rightarrow$ Data payload delivered to the application
D
Frame (Ethernet header and trailer removed) $\rightarrow$ Segment (TCP header removed) $\rightarrow$ Packet (IP header removed) $\rightarrow$ Data payload delivered to the application

Cevap

The correct sequence processes the Frame (removing Ethernet header/trailer), then the Packet (removing IP header), followed by the Segment (removing TCP header), and finally delivers the raw Data payload to the application.

During de-encapsulation on a receiving host, processing proceeds bottom-up through the protocol stack. The Network Interface Card first processes the Layer 2 Frame by removing the Ethernet header and FCS trailer. The network stack then processes the Layer 3 IP Packet by stripping the IP header. Next, the transport layer parses the Layer 4 TCP Segment, strips the TCP header based on port 443 identification, and delivers the remaining application Data payload to the listening web service.

Adım Adım Çözüm

Analyze Layer 2 de-encapsulation at the Physical/Data Link interface

The NIC receives physical signals, frames them, verifies the Frame Check Sequence (FCS) trailer, strips the Ethernet header and trailer, and yields a Layer 3 PDU (Packet).

Layer 2 headers must be processed first to confirm local hardware delivery and frame integrity.

Analyze Layer 3 de-encapsulation within the OS kernel network stack

The IP protocol module examines the Layer 3 header, validates the destination IP address, strips the IP header, and identifies the upper-layer protocol (TCP).

Layer 3 processing routes the packet to the local host and uncovers the enclosed Layer 4 segment.

Analyze Layer 4 de-encapsulation for port matching

The TCP module parses the Layer 4 segment header, reassembles sequence numbers, identifies destination port 443, strips the TCP header, and passes the remaining payload up to the application.

Layer 4 headers contain port numbers needed to direct traffic to the correct application process.

Anahtar Kavram

De-encapsulation sequence from Layer 2 to Layer 7 (Frame -> Packet -> Segment -> Data)

Tahmini Süre:1m 30s

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