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Cisco 642-437 Exam -

Free 642-437 Sample Questions:

Q: 1
How many IP phone calls can be sent across a 64kb/s Frame Relay link that uses the G.729 codec? The sampling rate is 50 times a second, with 20 bytes per sample. There are 8 bytes of Frame Relay header overhead with no checksum, and header compression is used.
A. 3
B. 4
C. 5
D. 7
Answer: C

Q: 2
You are configuring a network to support voice to the PSTN. One important aspect to the configuration is to be able to determine the individual slot, subunit, and port number from the gateway endpoint identifier. Which signaling protocol is appropriate for this situation?
A. H.323
Answer: D

Q: 3
In which situation would an administrator configure telephony services, but not configure any individual ephones?
A. Phones that are controlled by Cisco Unified Communications Manager Express
B. Cisco Unified Communications Manager SRSTfallback
C. Cisco Unified Communications Manager Express with HSRP
D. Remotely located phones that are controlled by a third-part PBX
E. This is not a valid scenario. Ephones are always required.
Answer: B

Q: 4
Which command should be included in order to trust the DSCP-marked traffic from the distribution on layer?
A. mis qos trust cos
B. mis trust dscp-cos
C. mis qos trust dscp
D. mis qos trust dscp-sos
Answer: C

Q: 5
Which three methodologies are specific types of QoS used on a 512-kb/s point-to-point IP WAN link? (Choose three.)
A. header compression
B. FTF.12
D. MultilinkPPP
Answer: A

Q: 6
In which situation would the trust boundary be located at the access layer?
A. if the endpoints, both IP phones and PCs, are incapable of marking traffic properly
B. if PCs are switched through an IP phone and the IP phone traffic can be trusted to mark both traffic streams properly
C. if the access layer switch cannot trust or re-matk incoming traffic from endpoints properly
D. if there are endpoints that cannot be trusted and connect directly to the distribution layer
Answer: B

Q: 7
A new Cisco 7965 IP phoned is installed on a Cisco Unified Communications Manager Express system. When the phone requests the loads file from the TFTP server, it sees that the versions are different. What does the IP phone do to resolve this issue?
A. The IP phone requests the SEP<mac>.cfg file and reboots
B. The IP phone attempts to obtain the new firmware file image from the TFTP server.
C. The IP phone boot requests the XMLDefault.cnf.xml file and boots up.
D. The IP phone does not boot up and will require manual intervention to factory reset and phone before a new firmware image can be downloaded.
Answer: B

Q: 8
In which way does SIP Early Media differ from SIP Delayed Offer?
A. In SIP Early Media mode, the SDP media capabilities are exchanged in the INVITE and the 200 OK messages.
B. SIP Early Media use session indicator 183
C. The INVITE message include an SDP-formatted list of media capabilities(including codecs) that are supported by the originating UA.
D. The 200 OK message carries an SDP message with the final media description that has been selected by the terminating UA based on the received list and the locally supported options.
Answer: B

Q: 9
The router with the IP address of needs to be configured to use the device as the clock source. Which configuration command wi accomplish this task?
A. clock source
B. ntp server
C. clock set
D. ntp source ip addr
E. ntp client server
Answer: B

Q: 10
Refer to the exhibit.

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. 14087071222
B. 11222
C. 14801222
D. 1222
E. 4Q87071222
Answer: D

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