Download New Latest (May) Cisco 642-437 Actual Tests 1-10

Ensurepass

 


Exam A

 

QUESTION 1  (Topic 1)

 

How are firmware images implemented and which file type describes the contents of the firmware image?

 

A.

Firmware images are implanted as firmware groups that are described by a file that has a .cnf suffix.

B.

Firmware images are implemented as individual files that are described by a file that has a .loads suffix.

C.

Firmware images are implemented as a file loader group and are described by a file that ends with a .sbn suffix.

D.

Firmware images are implemented as file bundles that are described by a file that ends with a .loads suffix.

 

Answer: D

 

 

QUESTION 2

DRAG DROP  (Topic 1)

 

clip_image001

Answer:

 

 

clip_image002

 

A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 3  (Topic 1)

 

Calls are failing to egress the local PSTN gateway that uses an E1 PRI circuit. Which debug command would be most useful in determining which dialed digits are being sent to the PSTN?

 

A.

debug voice dial-peer

B.

debug isdn q921

C.

debug isdn q931

D.

ccapi inout

 

Answer: C

Explanation: Debug isdn q931 command to display information about call setup and teardown of ISDN network connections (Layer 3).In order to verify the layer 3 signaling we need to enable layer 3 signaling command. ISDN q921 is for layer2. Debug isdn q931 shows the calling number and called number. If the calls are failing, we can also see the ISDN cause codes from the debug isdn q931 command. http://www.cisco.com/en/US/docs/ios/11_2/debug/command/reference/dipx.html#wp13263

 

 

QUESTION 4  (Topic 1)

 

 

Refer to the exhibit. Consider an outgoing call that is being placed in all three scenarios that are shown in the exhibit. What is the result of the call, going down the table from top to bottom?

 

clip_image003

 

A.

success, success, success

B.

success, success, fail

C.

success, fail, success

D.

success, fail, fail

E.

fail, success, success

F.

fail, success, fail

 

Answer: A

Explanation: Various combinations of COR lists and the results are shown in this table:

 

 

 

clip_image004

 

clip_image005

 

 

 

http://www.cisco.com/en/US/tech/tk652/tk90/technologies_configuration_example09186a0 08019d649.shtml

 

 

QUESTION 5  (Topic 1)

 

Refer to the exhibit. What will the class map do if a packet arrives that is marked with a CoS of 6 and a DSCP value of EF?

 

clip_image006

 

A.

The class map will match the packet and forward it to the policy map to be marked.

B.

The class map will not map the packet and no QoS will be applied

C.

The class map will wait for the next packet in the stream to see if it has a CoS marking of 5 and then forward both packets to the policy map.

D.

For the packet to be forwarded to the policy map, it must have either a CoS of 5 or a DSCP value of EF.

 

Answer: B

Explanation: If there is no match for a packet, no QoS processing occurs on the packet and the switch offers best-effort service to the packet. http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/

 

 

 

configuration/guide/swqos.html

 

 

QUESTION 6  (Topic 1)

 

How does Packet Loss Concealment improve voice quality?

 

A.

Cisco Packet Loss Concealment technology decreases the voice sampling rate to 10 ms of the voice payload to smooth gaps in the voice stream.

B.

Packet Loss Concealment intelligently analyzes missing packets and generates a reasonable replacement packet to improve the voice quality.

C.

Packet Loss Concealment will buffer 20 to 50 ms of a voice stream to minimize lost or out-of-order voice packets.

D.

Packet Loss Concealment will compensate for packet loss rates between 1 and 5 percent by generating a reasonable replacement packet to improve the voice quality.

 

Answer: B

Explanation: Packet loss concealment is a technology designed to minimize the practical effect of lost packets in VOIP. PLC mitigates against the effects of packet loss, which is the failure of one or more transmitted packets to arrive at their destination, by artificially regenerating the packet received prior to the lost one, followed by insertion of the duplicated packet into the gap. The digital value of the dropped packet is estimated by interpolation and an artificially generated packet inserted on that basis. http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_tech_note09186a0080 0f6cf8.shtml

 

 

QUESTION 7  (Topic 1)

 

Refer to the exhibit. When 5551234 is being matched with the outgoing dial peer that is shown in the exhibit, which of the following called numbers will be sent to the PSTN?

 

clip_image007

 

A.

5551234

B.

1234

C.

555

D.

Null

E.

5

F.

51234

 

Answer: F

Explanation: On outbound POTS dial peers, the terminating router normally strips off all digits that explicitly match the destination pattern in the terminating POTS dial peer. Only digits matched by the wildcard pattern are forwarded. The forward-digits command can be used to forward a fixed number of dialed digits, or all dialed digits, regardless of the number of digits that explicitly match the destination pattern. http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/dial_peer/dp_confg.html#wp1067737

 

 

QUESTION 8

DRAG DROP  (Topic 1)

 

clip_image008

Answer:

 

 

clip_image009

 

A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 9

DRAG DROP  (Topic 1)

 

Drop

 

clip_image010

Answer:

clip_image011

 

A.

 

B.

 

C.

 

D.

 

 

Answer:

 

 

QUESTION 10  (Topic 1)

 

Which four Cisco IOS commands are required to configure a DHCP server on a voice gateway to support a voice subnet so that both IP addresses and the IP address of the TFTP server are provided? The voice subnet has an address of 10.1.130.0/24, the default gateway is 10.1.130.1/24, and the TFTP server is located at 10.1.5.2. (Choose four.)

 

A.

subnet 10.1.130.1/24

B.

ip dhcp pool voice

C.

default-router 10.1.130.1

D.

option 150 10.1.5.2

E.

network 10.1.130.0 255.255.255.0

F.

dhcp pool voice

G.

option 150 ip 10.1.5.2

H.

default-gw 10.1.130.1

 

Answer: BCEG

Free VCE & PDF File for Cisco 642-437 Real Exam

Instant Access to Free VCE Files: CCNA | CCNP | CCIE …
Instant Access to Free PDF Files: CCNA | CCNP | CCIE …