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Cisco Voice Over IP Sample Questions:

1. In the connection between a Cisco router and an E&M port on a PBX, which side is generally the Cisco side?

A) loop start
B) signaling unit
C) trunk circuit
D) switch port

2. 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) h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1
D) gateway

3. You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?

A) The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.
B) There will be no noticeable drop in quality.
C) The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
D) After the jitter buffer fills up, subsequent packets are discarded.

4. Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?

A) prefix extension
B) number expansion
C) digit masking
D) forward digits

5. In the connection between a Cisco router and an E&M port on a PBX, which side is generally the Cisco side?

A) loop start
B) signaling unit
C) trunk circuit
D) switch port

Solutions: