ACA Quality of Service & Traffic Management 3

Question 1

What is the key difference between traffic shaping and traffic policing?

Accepted Answer

Shaping buffers excess packets to smooth traffic; policing drops or re-marks excess packets immediately

Answer

Shaping drops excess packets; policing buffers them

Answer

Shaping works at Layer 2; policing works at Layer 3

Answer

Shaping is used on WAN links only; policing is used on LAN links only

Question 2

Which queuing mechanism uses multiple queues with configurable weights to distribute bandwidth proportionally?

Accepted Answer

Weighted Round Robin (WRR)

Answer

First In First Out (FIFO)

Answer

Strict Priority Queuing (PQ)

Answer

Tail-Drop Queuing

Question 3

On Aruba AOS-CX switches, where are QoS policies most commonly applied to enforce traffic prioritization?

Accepted Answer

On ingress and egress interfaces using QoS profiles

Answer

On the switch management VLAN interface only

Answer

Only on uplink ports connecting to routers

Answer

Within the spanning tree configuration

Question 4

What is 'jitter' in the context of network QoS for real-time applications?

Accepted Answer

The variation in packet arrival delay over time

Answer

The total one-way delay from source to destination

Answer

The percentage of packets lost during transmission

Answer

The maximum throughput of a network path

Question 5

Which DSCP Assured Forwarding (AF) class is recommended for interactive video conferencing traffic?

Accepted Answer

AF41 (DSCP 34)

Answer

AF11 (DSCP 10)

Answer

AF21 (DSCP 18)

Answer

CS1 (DSCP 8)

Question 6

In Aruba wireless networks, which WMM access category maps to voice traffic?

Accepted Answer

AC_VO (Voice)

Answer

AC_BE (Best Effort)

Answer

AC_BK (Background)

Answer

AC_VI (Video)

Question 7

What QoS action can Aruba switches perform on incoming traffic that is already marked with a DSCP value at the network edge?

Accepted Answer

They can trust, re-mark, or reclassify the DSCP marking using QoS policies

Answer

They can only forward the traffic as-is and cannot modify markings

Answer

They automatically strip all DSCP markings for security

Answer

They convert DSCP markings to 802.1p CoS only if the packet crosses a VLAN boundary