300-360 Question #2: Real Exam Question with Answer & Explanation

The correct answer is A: 34. The 802.11e standard defines four access categories (ACs): AC_VO (Voice), AC_VI (Video), AC_BE (Best Effort), and AC_BK (Background). The Video access category (AC_VI) maps to DSCP AF41, which has a decimal value of 34. In binary, AF41 is 100010, which equals 34 in decimal. This

Question

A network engineer wants the DSCP marking to align with the 802.11e access category video. What will this marking be?

Options

A34
BAF31
C40
D56

Explanation

The 802.11e standard defines four access categories (ACs): AC_VO (Voice), AC_VI (Video), AC_BE (Best Effort), and AC_BK (Background). The Video access category (AC_VI) maps to DSCP AF41, which has a decimal value of 34. In binary, AF41 is 100010, which equals 34 in decimal. This is the standard DSCP-to-802.11e UP (User Priority) mapping used in Cisco wireless QoS configurations. DSCP 40 maps to CS5 (not AC_VI), DSCP 46 maps to EF (voice/AC_VO), and DSCP 56 maps to CS7 (network control/AC_VO).

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