Free pass4sure ccnp 642-845 2.85 Download

Exam Number/Code: 642-845
Exam Name: ONT – Optimizing Converged Cisco Networks
VUE Code: 642-845
Questions Type: Multiple choice,
Exam Language(s): English

“ONT – Optimizing Converged Cisco Networks”, also known as 642-845 exam, is a Cisco certification.
Preparing for the 642-845 exam Searching 642-845 Test Questions, 642-845 Exam, 642-845 Dumps

With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 166 Q&As to your 642-845 Exam preparation. In the 642-845 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.

The Optimizing Converged Cisco Networks (642-845 ONT) is a qualifying exam for the Cisco Certified Network Professional CCNP®. The ONT 642-845 exam will certify that the successful candidate has important knowledge and skills in optimizing and providing effective QOS techniques for converged networks. The exam topics include implementing a VOIP network, implementing QoS on converged networks, specific IP QoS mechanisms for implementing the DiffServ QoS model, AutoQoS, wireless security and basic wireless management.

QUESTION 26:
VOIP gateways terminate a large of number of analog circuits in the PassGuide
network. What three types of interfaces do voice gateways use to connect to analog
interfaces? (Select three)
A. E1 CCS
B. E&M
C. Serial
D. FXS
E. FXO
F. T1 CAS
Answer: B, D, E
Explanation:
Gateways use different types of interfaces to connect to analog devices, such as phones,
fax machines, or PBX or public switched telephone network (PSTN) switches. Analog
interfaces used at the gateways include these three types:
FXS: The FXS interface connects to analog end systems, such as analog phones or
analog faxes, which on their side use the FXO interface. The router FXS interface
behaves like a PSTN or a PBX, serving phones, answering machines, or fax machines
with line power, ring voltage, and dial tones. If a PBX uses an FXO interface, it can also
connect to a router FXS interface. In this case, the PBX acts like a phone.
FXO: The FXO interface connects to analog systems, such as a PSTN or a PBX, which
on their side use the FXS interface. The router FXO interface behaves like a phone,
getting line power, ring voltage, and dial tones from the other side. As mentioned, a PBX
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can also use an FXO interface toward the router (which will then use an FXS interface),
if the PBX takes the role of the phone.
E&M: The E&M interface provides signaling for analog trunks. Analog trunks
interconnect two PBX-style devices, such as any combination of a gateway (acting as a
PBX), a PBX, and a PSTN switch. E&M is often defined to as “ear and mouth,” but it
derives from the term “earth and magneto.” “Earth” represents the electrical ground, and
“magneto” represents the electromagnet used to generate tones.
QUESTION 27:
PassGuide has several offices around the country. They have deployed a VOIP
network with Cisco Unified CallManager in a multisite centralized configuration
but there is a requirement to place a call agent at some of the remote sites. Which
IOS gateway feature should be deployed at the remote site to enable local call
control?
A. Survivable Remote Site Telephony (SRST)
B. Gatekeeper multizone
C. Cisco Unified CallManager Express (CME)
D. Call Admission Control (CAC)
E. Automatic Alternate Routing (AAR)
F. None of the above
Answer: C
Explanation:
Cisco Unified CallManager is the IP-based PBX in an IP telephony solution. It acts as a
call agent for IP phones and MGCP gateways and can also interact with H.323 or SIP
devices using their protocols. For redundancy and load sharing, multiple Cisco Unified
CallManager servers operate in a cluster. From an administration perspective, the whole
cluster is a single logical instance.
Cisco IOS routers can permanently act as a call agent for IP phones. The feature that
provides this functionality is Cisco Unified CallManager Express. With Cisco Unified
CallManager Express, Cisco Unified CallManager functionality is provided by the router.
If the router is also a voice gateway, it combines IP telephony and VoIP gateway
functionality in a single box.
Cisco IOS gateways also support other features, such as call preservation (Real-Time
Transport Protocol [RTP] stream) in case of a lost signaling channel, dual tone
multifrequency (DTMF) relay capabilities, supplementary services support (for user
functions, such as hold, transfer, and conferencing), and fax and modem support.
QUESTION 28:
Two PassGuide phones connect to Cisco Gateway routers as shown below:
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PassGuide 1 configuration exhibit:
PassGuide 2 configuration exhibit:
Study the exhibits shown above. Both routers have been configured as VoIP
gateways. They must also support traditional telephony devices to connect to analog
telephones. Which two configuration changes would correctly support the voice
requirements? (Select two)
A. On each router, under the dial-peer voice 1 pots configuration, add the port 1/0/0
command.
B. Under the dial-peer voice 2 voip configuration, change the destination pattern of 1111
to 2222 on the PassGuide 1 router, and 2222 to 1111 on the PassGuide 2 router.
C. Under the dial-peer voice 2 voip configuration, change the destination target address
of 10.2.2.2 to 10.1.1.1 on the PassGuide 1 router, and the destination target address of
10.1.1.1 to 10.2.2.2 on the PassGuide 2 router.
D. On each router, configure dial-peer voice 1 as a voip connection and configure
dial-peer voice 2 as a pots connection.
E. On each router, under the dial-peer voice 1 pots configuration, add the port fa0/0
command.
F. Under the dial-peer voice 1 pots configuration, change the destination pattern of 1111
to 2222 on the PassGuide 1 router, and 2222 to 1111 on the PassGuide 2 router.
Answer: A, B
Explanation:
642-845
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Command Description Introduction
dial-peer voicetag type Use the dial-peer voice command to
enter the dial peer subconfiguration
mode. The tag value is a number that
has to be unique for all dial peers
within the same gateway. The type
value indicates the type of dial peer
(for example, POTS or VoIP).
destination-pattern
telephone_number
The destination-pattern command,
entered in dial peer subconfiguration
mode, defines the telephone number
that applies to the dial peer. A call
placed to this number will be routed
according to the configuration type
and port (in the case of a POTS type
dial peer) or session target (in the
case of a VoIP type dial peer) of the
dial peer.
portport-number The port command, entered in POTS
dial peer subconfiguration mode,
defines the port number that applies
to the dial peer. Calls that are routed
using this dial peer are sent to the
specified port. The port command
can be configured only on a POTS
dial peer.
session target ipv4:ip-address The session target command, entered
in VoIP dial peer subconfiguration
mode, defines the IP address of the
target VoIP device that applies to the
dial peer. Calls that are routed using
this dial peer are sent to the specified
IP address. The session target
command can be configured only on
a VoIP dial peer.
QUESTION 29:
642-845
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You need to determine the correct ports to use on a new Cisco router which will be
used as a VOIP gateway. Which two statements are true about voice ports on a
router? (Select two)
A. Calls made to the PSTN can be made via FXS or T1/E1 trunk ports.
B. Analog and IP phones can be connected to the VoIP network via FXO or T1/E1 trunk
ports.
C. Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
D. Calls between analog phones that are attached to the FXS ports in a VoIP network can
be completely processed by voice-enabled routers.
Answer: C, D
Explanation:
FXS: The FXS interface connects to analog end systems, such as analog phones or
analog faxes, which on their side use the FXO interface. The router FXS interface
behaves like a PSTN or a PBX, serving phones, answering machines, or fax machines
with line power, ring voltage, and dial tones. If a PBX uses an FXO interface, it can also
connect to a router FXS interface. In this case, the PBX acts like a phone.
FXO: The FXO interface connects to analog systems, such as a PSTN or a PBX, which
on their side use the FXS interface. The router FXO interface behaves like a phone,
getting line power, ring voltage, and dial tones from the other side. As mentioned, a PBX
can also use an FXO interface toward the router (which will then use an FXS interface),
if the PBX takes the role of the phone.
QUESTION 30:
A Cisco router acts as a voice gateway in the PassGuide network, converting digital
to analog signals. Which statement is true about the digital to analog conversion
process?
A. The two steps of digital to analog conversion are quantization and decoding.
B. The two steps of digital to analog conversion are decoding and filtering.
C. The two steps of digital to analog conversion are decompression and reconstruction of
the analog signal.
D. The two steps of digital to analog conversion are decompression and filtering of the
analog signal.
E. None of the above
Answer: C