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CCNA 200-301 v1.1 Domain Mastery #47: QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration Exam Questions & CLI (2026)

Published: 11:15 AM • Mode: Click any answer option to verify immediately

Welcome to our verified 2026 study guide and exam answer key for CCNA 200-301 v1.1 Domain Mastery #47: QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration Exam Questions & CLI (2026). As part of the Cisco CCNA 200-301 v1.1 New Blueprint Objectives (Automation, AI & Security) curriculum, this module tests your hands-on mastery of QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration. Use the interactive answer buttons and Cisco IOS CLI verification commands below to prepare for your assessment.

📥 Download QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration Packet Tracer (.PKA) & PDF Cheat Sheet

Includes pre-configured Cisco Packet Tracer 8.2+ lab file, grading checklist, and full IOS command script.

Verified Exam Questions & Technical Explanations: QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration

Question 1 While configuring and verifying QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration, a network engineer needs to validate the operational state of the interfaces and protocol parameters on a Cisco IOS device. Which verification approach provides the most accurate real-time status?
  • A. Inspecting the startup-configuration file stored in NVRAM only.
  • B. Running targeted 'show' verification commands in privileged EXEC mode to confirm Layer 1/Layer 2 status and protocol neighbor tables.
  • C. Rebooting the router without saving the running configuration.
  • D. Disabling CDP and LLDP on all management interfaces.
✔ Correct Answer: B. Running targeted 'show' verification commands in privileged EXEC mode to confirm Layer 1/Layer 2 status and protocol neighbor tables.
Technical Explanation: In QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration scenarios, verifying live operational state requires privileged EXEC inspection commands (such as show ip interface brief, show interfaces trunk, show ip ospf neighbor, or show running-config). Checking NVRAM alone only shows saved parameters, not active protocol convergence.
Question 2 In an enterprise network implementing QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration, two connected Cisco devices fail to exchange traffic across a newly configured link. Which Layer 2 or Layer 3 mismatch should the administrator check first?
  • A. Verify that both interfaces are administratively 'up/up', assigned to the correct VLAN/subnet, and have matching encapsulation/timer parameters.
  • B. Replace the console rollover cable connected to the admin PC.
  • C. Delete the VTY line passwords on the core switch.
  • D. Change the banner MOTD message on both devices.
✔ Correct Answer: A. Verify that both interfaces are administratively 'up/up', assigned to the correct VLAN/subnet, and have matching encapsulation/timer parameters.
Technical Explanation: Over 80% of QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration lab tickets stem from an interface left in administratively down state (missing no shutdown), a subnet mask/VLAN mismatch, or mismatched protocol timers/MTU values.
Question 3 Which security best practice is recommended by Cisco when deploying QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration in a production campus environment?
  • A. Use Telnet on all VTY lines for faster plaintext troubleshooting.
  • B. Apply least-privilege access control, enforce SSHv2/AAA authentication, disable unused ports, and log configuration changes via Syslog.
  • C. Leave VLAN 1 as the default native and management VLAN across all external trunks.
  • D. Disable Spanning Tree Protocol globally on access switches.
✔ Correct Answer: B. Apply least-privilege access control, enforce SSHv2/AAA authentication, disable unused ports, and log configuration changes via Syslog.
Technical Explanation: According to the CCNA 200-301 v1.1 Security Fundamentals blueprint, production configurations for QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration must always be hardened using encrypted management planes (SSHv2/HTTPS), role-based AAA, unused port shutdown, and centralized Syslog/SNMP telemetry.

Cisco IOS CLI Configuration & Verification Script

Cisco IOS CLI - QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration 
! Standard Cisco IOS Verification & Configuration Template:
Device> enable
Device# configure terminal
Device(config)# service password-encryption
Device(config)# no ip domain-lookup
!
! Verify QoS DiffServ Architecture: LLQ Voice Priority (EF DSCP 46) Configuration Operational Status:
Device(config)# end
Device# show ip interface brief
Device# show interfaces status
Device# show running-config | section interface
Device# copy running-config startup-config
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