350-801 Question #39: Real Exam Question with Answer & Explanation

Question

An engineer is designing a high availability and failover solution for two Cisco Unified Border Element routers. The first router (cube 1.abc.com) takes 60% of the calls and the second router (cube2 abc.com) takes 40% of the calls. Assume all DNS A records have been created. Which two SRV records are needed for a load balanced solution? (Choose two.)

Options

• A_sip_udp.abc.com 60 IN SRV 1 60 cube1.abc.com
• B_sip_udp.abc.com 60 IN SRV 1 40 cube2.abc.com
• C_sip_udp.abc.com 60 IN SRV 60 1 cube1abc.com
• D_sip_udp.abc.com 60 IN SRV 2 60 cube1.abc.com
• E_sip_udp.abc.com 60 IN SRV 3 60 cube2.abc.com

Explanation

This question requires identifying the correct SRV record syntax to achieve a load-balanced solution between two Cisco Unified Border Element (CUBE) routers with specified weight distribution for SIP over UDP.

Common mistakes.

• C. This choice has the priority and weight fields swapped, which is incorrect for SRV record syntax.
• D. While the priority and weight are in the correct positions, this option only provides one part of the load-balancing pair, and another record is needed to complete the 60/40 split.
• E. This choice has the correct syntax for priority and weight, but assigns a weight of 60 to cube2, which contradicts the problem statement of 40% for cube2.

Concept tested. DNS SRV record configuration for SIP load balancing

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12/srnd_edge.html

No community discussion yet for this question.