Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 359

Company_A is implementing VoIP services across the company. The network architect designed a QoS policy to allow only specific IP subnets and mark the signaling flow with DSCP 36. The solution should be as secure as possible. Phones receive their IP addresses from the 172.184.12.0/24 pool and are assigned by the RADIUS server to VLAN 1021. Skinny Client Control Protocol is used as a signaling protocol in the network. For security reasons, switchport port security maximum 1 vlan voice has been preconfigured on the switch side. Which two tasks must an engineer perform on SW_1 to achieve this goal? (Choose two.)

Answer options

• A. Implement a class map with the set dscp af43 command.
• B. Implement an ACL with the permit udp 172.184.12.0 0 0.0.0.255 any range 2000 2002 command.
• C. Implement a class map with the set dscp af42 command.
• D. Implement an ACL with the set dscp af4t command.
• E. Implement an ACL with the permit tcp any 10.124.121.0 0 0.0.0.255 range 16384 32767 command.

Correct answer: B, C

Explanation

The correct answers are B and C. Option B allows the necessary UDP traffic for VoIP from the specified subnet, ensuring the signaling and media flows are permitted. Option C is incorrect because it does not match the required DSCP value of 36; it instead sets DSCP to af42, which does not align with the QoS policy designed for the signaling flow.