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Cisco 642-432 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Voice Gateway and Protocol Integration | - VoIP signaling protocols
|
| IP Phone Deployment and Features | - Endpoint registration and configuration
|
| Quality of Service (QoS) for Voice | - Voice traffic prioritization
|
| Call Control and Survivability | - SRST (Survivable Remote Site Telephony)
|
| Cisco Unified Communications Architecture | - Call processing design
|
Cisco Voice Over IP Sample Questions:
In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deployed without redundancy checks?
- A. 2 bytes
- B. 40 bytes
- C. 3 bytes
- D. 4 bytes
- E. 20 bytes
- F. 1 byte
Correct Answer: A 🗳️
Refer to the exhibit. Enzo's Bikes manufactures high end bicycle frames. Until recently they sold only to bicycle shops; however, now they are starting to sell to end users. They need a way to add two additional sales staff and ensure that the senior sales technician always gets the first call. Drew is the senior sales technician. Bob is the newest sales technician. Bob's phone should always be the last one chosen for incoming sales calls, after Drew and James. Bob's phone should be chosen first only when Drew and James are busy on calls.
Select the correct dial-peer command set for Bob's phone.
- A. dial-peer voice 3 pots destination-pattern 5555110 preference high
- B. dial-peer voice 3 pots destination-pattern 5555110 preference 3 huntstop
- C. dial-peer voice 3 pots destination-pattern 5555110 preference firstlast
- D. dial-peer voice 3 pots destination-pattern 5555110 preference 0
- E. dial-peer voice 3 pots destination-pattern 5555110 preference 2
Correct Answer: E 🗳️
Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?
- A. number expansion
- B. prefix extension
- C. forward digits
- D. digit masking
Correct Answer: A 🗳️
Examine the example output.
hostname GW1 ! interface Ethernet 0/0 ip address 172.16.2.1 255.255.255.0 h323-gateway voip interface h323-gateway voip id GK1-zone1.abc.com abc.com ipaddr 172.16.2.2 h323-gateway voip h323-id GW1 h323-gateway voip bind srcaddr 172.16.2.1 ! dial-peer voice 1 voip destination-pattern 1212. session-target ras ! dial-peer voice 2 pots destination-pattern 2125551212 no register e164 !
end
Choose the command that will restore communication with gatekeeper functionality to this device.
- A. h323-gateway voip bind srcaddr 172.16.2.2
- B. h323-gateway voip h323-id GK1
- C. gateway
- D. h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1
Correct Answer: C 🗳️
What does a gateway router match to a dialed number when setting up a VoIP call?
- A. call leg
- B. IP route
- C. session target
- D. destination pattern
Correct Answer: D 🗳️
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