DRAG DROP Match the appropriate QoS concept with its definition. (Options may be used more than once or not at all.) https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/HP_HPE7-A01/page_63_img_1.jpg

Best Effort Service maps to first-come, first-served, Class of Service goes with the 802.1Q VLAN L2 marking, Differentiated Services matches layer-3 with 64 classes (DSCP), and WMM is for the Wi-Fi ACs under 802.11e.I see people mix up CoS and DiffServ a lot-easy trap since both deal with prioritizing packets, just at different layers. Pretty sure this is right from what I've seen in similar questions, but let me know if you caught something else.

Best Effort Service → first-come, first-served, Class of Service → 802.1Q L2 marking, Differentiated Services → L3 64 classes, WMM → 802.11e access categories

Question 11 - HP HPE7-A01 Real Exam Questions [March 2026 Update]

Q: 11

DRAG DROP Match the appropriate QoS concept with its definition. (Options may be used more than once or not at all.)

Drag & Drop

Enable JavaScript to use the Drag & Drop feature.

Best Effort Service
Class of Service
Differentiated Services
WMM

Correct Answer:

Answer Area A method for classifying network traffic at layer-2 by marking 802.1Q VLAN Ethernet frames with one of eight service classes: B. Class of Service A method for classifying network traffic at layer-3 by marking packets with one of 64 different service classes: C. Differentiated Services A method where traffic is treated equally in a first-come, first-served manner: A. Best Effort Service A method for classifying network traffic using access categories based on the IEEE 802.11e QoS standard: D. WMM

Explanation

Class of Service (CoS) operates at Layer 2, utilizing the 3-bit Priority Code Point (PCP) field within the 802.1Q Ethernet header to define 8 priority levels (0–7). Differentiated Services (DiffServ) functions at Layer 3. It re-purposes the ToS byte in the IPv4 header (or Traffic Class in IPv6) to use the 6-bit Differentiated Services Code Point (DSCP), allowing for 2^6 = 64 distinct traffic classifications. Best Effort Service is the default behavior where no QoS mechanisms are applied. Network devices forward packets in the order they arrive (First-In, First-Out) without guarantees for bandwidth or latency.

WMM (Wi-Fi Multimedia) is a subset of the IEEE 802.11e standard adapted by the Wi-Fi Alliance. It prioritizes wireless traffic into four Access Categories (AC): Voice, Video, Best Effort, and Background.

References

RFC 2474, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers," Internet Engineering Task Force (IETF), December 1998. (Defines Layer 3 DiffServ and the 6-bit DSCP field).

IEEE Std 802.1Q-2018, "IEEE Standard for Local and Metropolitan Area Networks—Bridges and Bridged Networks," IEEE Computer Society, Section 6.9.3 "Priority Code Point (PCP) encoding". (Defines Layer 2 classification using the 3-bit field for 8 priority levels).

Cisco Systems, "Quality of Service (QoS) Configuration Guide, Cisco IOS XE 17.x," Chapter: "QoS Overview," Section: "QoS Models." (Details Best Effort, IntServ, and DiffServ models).

Wi-Fi Alliance, "WMM (Wi-Fi Multimedia) Specification," Version 1.2.0. (Defines the implementation of IEEE 802.11e QoS and Access Categories).

Aruba (HPE), "ArubaOS 8.6.0.0 User Guide," Chapter: "Quality of Service," Section: "Wi-Fi Multimedia." (Explains WMM and its relation to 802.11e Access Categories).

Premium Access Includes

FLASH OFFER

avail 10% DISCOUNT on YOUR PURCHASE