Remember BDR
Full name: Backup Designated Router
Memory aid: Backup waits behind the Designated Router.
DR and BDR election behavior depends on OSPF network type and priorities.
Study area: Protocols & logical ports · Batch 7
Relevant study for: CompTIA A+ Core 1 220-1201 · CompTIA Network+ N10-009 · CompTIA Security+ SY0-701 · Cisco CCNA 200-301 · ISC2 CISSP 2024 outline
Practice with exam flashcards →Networking & Connectivity / Knowledge library
BDR — Backup Designated Router
Provides a standby designated-router role on eligible OSPF networks.
Why learn BDR — Backup Designated Router?
Provides a standby designated-router role on eligible OSPF networks.
Where it came from
DR and BDR election behavior depends on OSPF network type and priorities.
- Memory aid (a learning cue, not the expansion): Backup waits behind the Designated Router.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand BDR: Backup Designated Router.
- Recall this memory aid: Backup waits behind the Designated Router.
- Explain the practical use: Provides a standby designated-router role on eligible OSPF networks.
- Explain this distinction: DR and BDR election behavior depends on OSPF network type and priorities.
- Identify BDR in a device specification, architecture diagram, or system inventory.
Documentation and sources
- IETF RFC 2328 (www.rfc-editor.org)