DRAG DROP
65
Cisco 642-437 Exam
A.
B.
C.
D.
Correct Answer:
Explanation/Reference:
When designing a large-scale dial plan, Cisco recommends you adhere to the following attributes:·Logic distribution: Good dial plan architecture relies on the effective distribution of the dial plan logic amongthe various components. Devices that are isolated to a specific portion of the dial plan reduce thecomplexity of the configuration. Each component focuses on a specific task accomplishment. Generally, thelocal switch or gateway handles details that are specific to the local point of presence (POP). Higher-levelrouting decisions are passed along to the gatekeepers and PBXs. A well-designed network places themajority of the dial plan logic at the gatekeeper devices.
Hierarchical design (scalability): You should attempt to keep the majority of the dial plan logic (routingdecisions and failover) at the highest-component level. Maintaining a hierarchical design makes the additionand deletion of number groups more manageable. Scaling the overall network is much easier whenconfiguration changes are made to a single component. ·Simplicity in provisioninG. Keep the dial plansimple and symmetrical when designing a network. Try to keep consistent dial plans on the network byusing translation rules to manipulate the local digit dialing patterns. These number patterns are normalizedinto a standard format or pattern before the digits enter the VoIP core. Putting digits into a standard formatsimplifies provisioning
66
Cisco 642-437
Exam and dial-peer management.
Reduction in postdial delay: Consider the effects of postdial delay in the network when you design a large-scale dial plan. Postdial delay is the time between the last digit dialed and the moment the phone rings atthe receiving location. In the PSTN, people expect a short postdial delay and to hear ringback withinseconds. The more translations and lookups that take place, the longer the postdial delay becomes. Overallnetwork design, translation rules, and alternate pathing affect postdial delay. Therefore, you shouldefficiently use these tools to reduce postdial delay. ·Availability and fault tolerancE. Consider overall networkavailability and call success rates when you design a dial plan. Fault tolerance and redundancy within VoIPnetworks are most important at the gatekeeper level. By using an alternate path you help provideredundancy and fault tolerance in the network.
Conformance to public standards: Different geographical locations might impose restrictions to your dialplan. Therefore, familiarize yourself with any such limitations prior to designing your dial plan.
Explanation/Reference:
Explanation:
When designing a large-scale dial plan, Cisco recommends you adhere to the following attributes:·Logic distribution: Good dial plan architecture relies on the effective distribution of the dial plan logic amongthe various components. Devices that are isolated to a specific portion of the dial plan reduce thecomplexity of the configuration. Each component focuses on a specific task accomplishment. Generally, thelocal switch or gateway handles details that are specific to the local point of presence (POP). Higher-levelrouting decisions are passed along to the gatekeepers and PBXs. A well-designed network places themajority of the dial plan logic at the gatekeeper devices.
Hierarchical design (scalability): You should attempt to keep the majority of the dial plan logic (routingdecisions and failover) at the highest-component level. Maintaining a hierarchical design makes the additionand deletion of number groups more manageable. Scaling the overall network is much easier whenconfiguration changes are made to a single component. ·Simplicity in provisioninG. Keep the dial plansimple and symmetrical when designing a network. Try to keep consistent dial plans on the network byusing translation rules to manipulate the local digit dialing patterns. These number patterns are normalizedinto a standard format or pattern before the digits enter the VoIP core. Putting digits into a standard formatsimplifies provisioning
66
Cisco 642-437
Exam and dial-peer management.
Reduction in postdial delay: Consider the effects of postdial delay in the network when you design a large-scale dial plan. Postdial delay is the time between the last digit dialed and the moment the phone rings atthe receiving location. In the PSTN, people expect a short postdial delay and to hear ringback withinseconds. The more translations and lookups that take place, the longer the postdial delay becomes. Overallnetwork design, translation rules, and alternate pathing affect postdial delay. Therefore, you shouldefficiently use these tools to reduce postdial delay. ·Availability and fault tolerancE. Consider overall networkavailability and call success rates when you design a dial plan. Fault tolerance and redundancy within VoIPnetworks are most important at the gatekeeper level. By using an alternate path you help provideredundancy and fault tolerance in the network.
Conformance to public standards: Different geographical locations might impose restrictions to your dialplan. Therefore, familiarize yourself with any such limitations prior to designing your dial plan.