CyberCertPrepNetwork FundamentalsOSI & TCP/IP ModelsEASYFree question
A packet is captured with an Ethernet frame. Inside is an IP packet. Inside that is a TCP segment carrying HTTP data. This layered structure is an example of what concept?
- A.Fragmentation (splitting datagrams to fit the path MTU)
- B.Tunneling
- C.Encapsulation - each protocol wraps the layer above's PDU with its own header
- D.Multiplexing (sharing one channel among many streams)
Why C is correct
Encapsulation: HTTP data (Layer 7) → TCP adds header → becomes a segment (Layer 4) → IP adds header → becomes a packet (Layer 3) → Ethernet adds header + FCS → becomes a frame (Layer 2) → transmitted as bits (Layer 1). De-encapsulation reverses this on the receiving side.
Know someone studying for Network Fundamentals? Send them this one.