Which of the following origin attribute is used to define the source of path information and mark how a route becomes a BGP route. Which of the following is the correct ranking of the priority of…

Question

Options

• AIncomplete>IGP>EGP
• BEGP>IGP>Incomplete
• CIGP>Incomplete>EGP
• DIGP>EGP>Incomplete

• A
  4% (1)
• B
  11% (3)
• C
  7% (2)
• D
  78% (21)

Explanation

D is correct because BGP's Origin attribute ranks as IGP > EGP > Incomplete, reflecting the trustworthiness of how the route was learned: IGP (Interior Gateway Protocol, e.g., OSPF/EIGRP injected via network command) is most preferred because it's fully known within the AS; EGP is less preferred since it comes from an older exterior protocol; Incomplete is least preferred because the route origin is unknown (typically learned via redistribution).

Why the distractors are wrong:

• A (Incomplete > IGP > EGP) inverts the logic entirely - it would prefer the least trustworthy origin.
• B (EGP > IGP > Incomplete) incorrectly elevates external/legacy routes above internally originated ones.
• C (IGP > Incomplete > EGP) gets the top right but swaps EGP and Incomplete - redistribution (Incomplete) is actually less preferred than EGP.

Memory tip: Think "I Earn Incomplete" - IGP → EGP → Incomplete, going from most to least trustworthy, just like a student going from an A to a C grade.

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