H12-821_V1.0 · Question #958
In BGP, ___ AS_Path and Next_Hop are recognized mandatory attributes.
The correct answer is A. O. ASE. In BGP, the three well-known mandatory attributes are ORIGIN, AS_PATH, and NEXT_HOP. Option A correctly identifies ORIGIN (often abbreviated as "O") as the missing attribute that completes the set alongside AS_Path and Next_Hop. These attributes are called "mandatory" because…
Question
Options
- AO. ASE
- B
- C
- D
How the community answered
(28 responses)- A75% (21)
- B7% (2)
- C14% (4)
- D4% (1)
Explanation
In BGP, the three well-known mandatory attributes are ORIGIN, AS_PATH, and NEXT_HOP. Option A correctly identifies ORIGIN (often abbreviated as "O") as the missing attribute that completes the set alongside AS_Path and Next_Hop. These attributes are called "mandatory" because every BGP UPDATE message must include them, and a router will reject an UPDATE that omits any one of them.
Options B, C, and D are empty and therefore cannot be correct answers.
Memory tip: Use the acronym "OAN" (ORIGIN, AS_PATH, NEXT_HOP) to remember the three BGP well-known mandatory attributes. You can think of it as "One Announcement Needs" all three to be valid.
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