300-070 Question #197: Real Exam Question with Answer & Explanation

The correct answer is C: 2591[12]. CUCM selects route patterns using a best-match (most specific) algorithm. When 25911 is dialed, all four patterns can potentially match: 259XX matches any 5-digit number starting with 259; 25XXX matches any 5-digit number starting with 25; 2[56]XXX matches any 5-digit number star

Question

Which route pattern is used when 25911 is dialed from an endpoint with a CSS that can access the required partition?

Options

A25XXX
B2[56]XXX
C2591[12]
D259XX

Explanation

CUCM selects route patterns using a best-match (most specific) algorithm. When 25911 is dialed, all four patterns can potentially match: 259XX matches any 5-digit number starting with 259; 25XXX matches any 5-digit number starting with 25; 2[56]XXX matches any 5-digit number starting with 25 or 26; and 2591[12] matches only 25911 or 25912. CUCM picks the pattern with the fewest wildcards - the most specific match. 2591[12] is the most specific because it constrains four of the five digit positions to exact values and limits the fifth position to only two possible digits. This leaves less ambiguity than 259XX (two wildcards), 25XXX (three wildcards), or 2[56]XXX (one character class plus three wildcards). Therefore 2591[12] wins the best-match selection.

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