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Cisco 642-437 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Signaling and Call Control | - Dial plans and call routing - SIP, H.323, and MGCP protocols - Gateways and gatekeepers |
| Topic 2: Quality of Service (QoS) | - QoS models and mechanisms - Congestion management and avoidance - Traffic classification and marking - Queuing techniques and bandwidth management |
| Topic 3: VoIP Fundamentals | - Voice over IP architecture and components - Voice codecs and compression techniques - Voice traffic signaling basics |
| Topic 4: Troubleshooting and Operations | - Voice and QoS troubleshooting methodologies - Common VoIP deployment issues |
| Topic 5: Call Admission Control and Performance | - Voice network performance considerations - Call admission control mechanisms |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
Refer to the exhibit.
Cisco 642-437 Exam
When an inbound PSTN call to 4087071222 is received by the router that is shown in the exhibit, what is the resulting called number?
- A. 4087071222
- B. 11222
- C. 14081222
- D. 14087071222
- E. 1222
Correct Answer: E 🗳️
Explanation: Only visible for Pass4Leader members. You can sign-up / login (it's free).
Which two gateway protocols can be configured if you have Cisco 2600XM or 3700 Series Multiservice Routers installed? (Choose two.)
- A. SCCP
- B. MGCP
- C. SIP
- D. H.323
Correct Answer: B,D 🗳️
Which command should you use to configure a T1 CAS trunk to use the most reliable line coding technique?
- A. linecode b8zs
- B. linecoding b8zs
- C. linecoding ami
- D. linecode ami
Correct Answer: A 🗳️
DRAG DROP
Drag the attributes of a scalable numbering plan from the left and place them in the boxes on the right.
Cisco 642-437 Exam
Correct Answer:
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 among the various components. Devices that are isolated to a specific portion of the dial plan reduce the complexity of the configuration. Each component focuses on a specific task accomplishment. Generally, the local switch or gateway handles details that are specific to the local point of presence (POP). Higher-level routing decisions are passed along to the gatekeepers and PBXs. A well-designed network places the majority of the dial plan logic at the gatekeeper devices.
Hierarchical design (scalability): You should attempt to keep the majority of the dial plan logic (routing decisions and failover) at the highest-component level. Maintaining a hierarchical design makes the addition and deletion of number groups more manageable. Scaling the overall network is much easier when configuration changes are made to a single component.
Simplicity in provisioning. Keep the dial plan simple and symmetrical when designing a network. Try to keep consistent dial plans on the network by using translation rules to manipulate the local
digit dialing patterns. These number patterns are normalized into a standard format or pattern before the digits enter the VoIP core. Putting digits into a standard format simplifies provisioning 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 at the receiving location. In the PSTN, people expect a short postdial delay and to hear ringback within seconds. The more translations and lookups that take place, the longer the postdial delay becomes. Overall network design, translation rules, and alternate pathing affect postdial delay. Therefore, you should efficiently use these tools to reduce postdial delay.
Availability and fault tolerance. Consider overall network availability and call success rates when you design a dial plan. Fault tolerance and redundancy within VoIP networks are most important at the gatekeeper level. By using an alternate path you help provide redundancy and fault tolerance in the network.
Conformance to public standards: Different geographical locations might impose restrictions to your dial plan. Therefore, familiarize yourself with any such limitations prior to designing your dial plan.
When marking traffic for Expedited Forwarding, how does a device that is not capable of recognizing DSCP interpret the EF binary string 101110?
- A. The first device in the network that does not recognize DSCP will use 110 as the CoS value and will replace the DSCP value with a CoS of 6 and forward the packet.
- B. The devices in the network that do not recognize DSCP will use the three high-order DSCP bits as the CoS setting, resulting in a CoS value of 5.
- C. The device that does not recognize DSCP will use 110 as the CoS value and forward the packet with a CoS of 6.
- D. The device that cannot recognize DSCP will use best effort to forward the packet.
Correct Answer: B 🗳️
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