200-150 · Question #142
Which protocol data unit is associated with the link layer of the TCP/IP model?
The correct answer is B. frame. In the TCP/IP model, the link layer (also called the network access layer) uses frames as its protocol data unit (PDU).
Question
Which protocol data unit is associated with the link layer of the TCP/IP model?
Options
- Apacket
- Bframe
- Csegment
- Ddatagram
How the community answered
(23 responses)- A4% (1)
- B87% (20)
- D9% (2)
Why each option
In the TCP/IP model, the link layer (also called the network access layer) uses frames as its protocol data unit (PDU).
Packets are the PDU of the Internet (network) layer, used by IP to route data between networks.
The link layer is responsible for transmitting data across a physical medium and encapsulates data into frames that include MAC addresses, framing delimiters, and an FCS for error checking. 'Frame' is the designated PDU at this layer, mapping to Layer 2 of the OSI model where technologies like Ethernet and Wi-Fi operate.
Segments are the PDU of the transport layer, used by TCP to carry application data with sequence and acknowledgment numbers.
Datagrams refer to PDUs at the Internet layer (IP datagrams) or to connectionless UDP messages at the transport layer, not the link layer.
Concept tested: TCP/IP model layers and protocol data units
Source: https://www.rfc-editor.org/rfc/rfc1122
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