HeaderStack CCNA
Step through encapsulation — click PDU blocks to inspect headers. Details stay in the panel beside the stack so you do not lose your place.
L2 = FrameL3 = PacketL4 = Segment / DatagramL7 = PayloadTrailer
PC→Switch→Router→Server
ICMP echo request at Layer 3
L2 frame · L3 packet · L4 segment · L7 payload · click any block
Explanation
ICMP echo request at Layer 3
The host builds an IPv4 packet toward the destination on the same subnet.
Host encapsulates application data down the stack
Click Ethernet, IPv4, or any PDU block to expand fields here.
Step 1 / 3Encapsulate ↓