Online Access Free 642-437 Exam Questions

Which dial plan component is responsible for choosing the appropriate path for a call?

• A.call coverage and path selection
• B.call route and path selection
• C.endpoint addressing
• D.calling privileges

When you implement the tail-end hop-off path-selection strategy, which task should you complete first?

• A.Define the VoIP inbound digit manipulation.
• B.Define the VoIP outbound digit manipulation.
• C.Define the inbound VoIP dial peer.
• D.Define the outbound VoIP dial peer.

DRAG DROP
Drag the components that make up Cisco fax relay and T.38 from the left and drop them under the appropriate category on the right.

Cisco 642-437 Exam

Correct Answer:

Explanation:

Cisco fax relay is the oldest method of supporting fax on Cisco IOS gateways and has been supported since Cisco IOS Release 11.3. Cisco fax relay uses Real-Time Transport Protocol (RTP) as the method of transport. In Cisco fax relay mode, gateways terminate T.30 fax signaling by spoofing a virtual fax machine to the locally attached fax machine. The gateways use a Cisco-proprietary fax-relay RTP-based protocol to communicate between them.
T.38 Fax Relay provides an ITU-T standards-based method and protocols for fax relay. Data is packetized and encapsulated according to the T.38 standard. The encoding of the packet headers and the mechanism to switch from VoIP mode to fax relay mode are clearly defined in the specification.
http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/voice_troubleshooting/old/vts_fax.html

How does a Cisco Unified Border Element support codec filtering?

• A.The Cisco Unified Border Element can be configured to support codec filtering by adding a list of supported codecs in global configuration mode.
• B.The Cisco Unified Border Element relies on the endpoint that initiates the call to determine which codes the call will use.
• C.The Cisco Unified Border Element can be configured to support codec filtering by adding one or more codec types to each dial peer that is configured in the device.
• D.The Cisco Unified Border Element will only support codec filtering in media flow-around mode so that endpoints can negotiate a specific codec independently.

Which feature can be used to avoid traffic congestion by dropping low-priority packets rather than dropping high-priority packets and is not recommended for voice networks?

• A.tail-drop
• B.class-based weighted fair queuing
• C.low latency queuing
• D.weighted random early detection