Remember SDU
Full name: Service Data Unit
Memory aid: Service receives Data before its own wrapping.
An SDU at one interface can be carried inside another layer's PDU.
Study area: Network architecture & switching · Batch 7
Relevant study for: CompTIA Network+ N10-009 · Cisco CCNA 200-301 · CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline
Practice with exam flashcards →Networking & Connectivity / Knowledge library
SDU — Service Data Unit
Names information supplied by one layer to the service of another.
Why learn SDU — Service Data Unit?
Names information supplied by one layer to the service of another.
Where it came from
An SDU at one interface can be carried inside another layer's PDU.
- Memory aid (a learning cue, not the expansion): Service receives Data before its own wrapping.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand SDU: Service Data Unit.
- Recall this memory aid: Service receives Data before its own wrapping.
- Explain the practical use: Names information supplied by one layer to the service of another.
- Explain this distinction: An SDU at one interface can be carried inside another layer's PDU.
- Identify SDU in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IEEE 802 LAN/MAN standards (www.ieee802.org)
- IETF Internet standards (www.rfc-editor.org)