VoIP Gateways

Here you will find answers to CVoice – VoIP Gateway Questions

Question 1

Refer to the exhibit. Choose the correct configuration command set that will allow the gateway in zone BR to register with the gatekeeper in the same zone.

A.
interface fastethernet 0/0
ip address 10.1.110.1
h323-gateway voip interface
h323-gateway voip id BR ipaddr 10.2.120.1
h323-gateway voip h323-id BRgw
!
gateway
B.
interface fastethernet 0/0
ip address 10.2.120.1
h323-gateway voip interface
h323-gateway voip id BR ipaddr 10.1.120.2
h323-gateway voip h323-id BRgw
!
gateway
C.
interface fastethernet 0/0
ip address 10.2.120.1
h323-gateway voip interface
h323-gateway voip id BR ipaddr 10.2.120.1
h323-gateway voip h323-id BRgw
!
gateway
D.
interface fastethernet 0/0
ip address 10.1.110.1
h323-gateway voip interface
h323-gateway voip id BR ipaddr 10.1.110.1
h323-gateway voip h323-id BRgw
!
gateway
E.
interface fastethernet 0/0
ip address 10.2.120.1
h323-gateway voip interface
h323-gateway voip id HQ ipaddr 10.1.110.1
h323-gateway voip h323-id BRgw
!
gateway

Answer: C

Explanation

Notice that the router at zone Br is functioned as both gateway and gatekeeper and it uses the IP address of 10.2.120.1 as the “zone local BR”. Therefore if we want “the gateway in zone BR to register with the gatekeeper in the same zone” we must use 10.2.120.1 in the command:

h323-gateway voip id BR ipaddr 10.2.120.1

In which, BR is the zone name defined in the “zone local BR” command (of the gatekeeper) and the is the IP address of an interface of the gatekeeper and it should be 10.2.120.1-> B, D and E are not correct.

A can be correct but it is not as clear as answer C.

Notice that last command h323-gateway voip h323-id BRgw specifies the BRgw is the name of the gateway to communicate with the gatekeeper.

Question 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 h323-id GK1
B. gateway
C. h323-gateway voip bind srcaddr 172.16.2.2
D. h323-gateway voip GW1-zone2.abc.com abc.com ipaddr 172.16.2.1

Answer: B

Explanation

The gateway command enables the H.323 VoIP gateway to register with the gatekeeper. This is the first command you should enter when configuring a voice gateway.

Question 3

Which item correctly describes the relationships between the feature and the category it belongs?

1	Supports analog faxes and modems on a VoIP network
2	Performs call setup and teardown between VoIP networks and the PSTN
3	Interconnects segments of the same or different VoIP networks using different media types
4	Interconnects segments of the same or different VoIP network using different signaling types

A. Gateway – 1 and 2
CUBE – 3 and 4
B. Gateway – 1 and 3
CUBE – 2 and 4
C. Gateway – 2 and 3
CUBE – 1 and 4
D. Gateway – 2 and 4
CUBE – 1 and 3

Answer: A