CyberCertPrepNetwork FundamentalsOSI & TCP/IP ModelsEASYFree question
Scenario
A junior engineer is studying for Network+ and asks: 'If I label an Ethernet frame, an IP packet, and a TCP segment in my notes, what is the correct OSI PDU name at each layer and which layer does each belong to?'
Match each PDU to its correct OSI layer: Ethernet frame, IP packet/datagram, TCP segment, and HTTP message (data from a browser request).
- A.Ethernet frame = Layer 3; IP packet = Layer 4; TCP segment = Layer 2; HTTP = Layer 1
- B.Ethernet frame = Layer 2 (Data Link, PDU name: Frame); IP packet/datagram = Layer 3 (Network, PDU name: Packet/Datagram); TCP segment = Layer 4 (Transport, PDU name: Segment); HTTP message = Layer 7 (Application, PDU name: Data/Message). Additionally: Layer 1 PDU = Bit; Layer 5/6 PDU = Data (session/presentation layers use 'Data')
- C.Ethernet frame = Layer 1; IP packet = Layer 2; TCP segment = Layer 3; HTTP = Layer 4
- D.All of these are called 'packets' regardless of the OSI layer
Why B is correct