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Question 1:
Refer to the exhibit.
A collaboration engineer needs to replace the original, single NTP server that was configured during the initial install of a Cisco UCM server. What is the first step to accomplish this task?
A. Stop the NTP service on Cisco UCM.
B. Enable NTP authentication for the new NTP server on Cisco UCM.
C. Restart the NTP service on Cisco UCM.
D. Delete the original NTP server from Cisco UCM.
Correct Answer: D
If you look at the exhibit on the “utils ntp status”, it shows two original servers installed. And if you ready the question carefully, there is a “,” after “original,”, which means, from two original NTP servers, only single NTP server needs to be delete. So you can delete a single NTP server from the two listed NTP servers. However, even if there is only one server, you can\’t enable authentication for the new NTP server, you need first add it, then enable it with command “utils ntp auth symmetric-key enable” which you get prompt to select for enable the authentication for the listed servers:
admin:utils ntp auth symmetric-key enable At the end, nothing in the question mentioned about NTP authentication, as you can see authentication report with the following command: admin:utils ntp auth symmetric-key status
Question 2:
On which Cisco Unified Communications Manager nodes can the TFTP service be enabled?
A. any node
B. any two nodes
C. only nodes that have Cisco Unified CM service enabled
D. any subscriber nodes
Correct Answer: A
From the SRND:
The Cisco TFTP service that provides this functionality can be enabled on any server node in the cluster. However, in a cluster with more than 1250 users, other services might be impacted by configuration changes that can cause the TFTP
service to regenerate configuration files. Therefore, Cisco recommends that you dedicate a specific subscriber node to the TFTP service, as shown in Figure 9-1, for a cluster with more than 1250 users or any features that cause frequent
configuration changes.
Question 3:
Refer to the exhibit.
A call is failing to establish between two SIP Devices The called device answers with this SOP. Which SDP parameter causes this issue?
A. The payload for G.711ulaw must be 18.
B. The calling device did not offer a ptime value.
C. The media stream is set to sendonly.
D. The RTP port is set to 0.
Correct Answer: D
The RTP port is used to send and receive media packets during a call. If the RTP port is set to 0, the called device will not be able to send or receive media packets, and the call will fail. The other options are not correct because:
A. The calling device did not offer a ptime value: The ptime value is used to specify the amount of time between each media packet. If the calling device does not offer a ptime value, the called device will use the default value of 20 milliseconds. B. The media stream is set to sendonly: The media stream is set to sendonly when the called device is only able to send media packets, and not receive them. This is not a problem, and the call will still succeed.
C. The payload for G.711ulaw must be 18: The payload for G.711ulaw is the type of media packet that is used. The payload must be set to 18 for G.711ulaw, but this is not a problem, and the call will still succeed.
Question 4:
What is the maximum one-way latency and jitter tor voice before quality issues arise?
A. Option A
B. Option B
C. Option C
D. Option D
Correct Answer: A
Question 5:
An engineer encounters third-party devices that do not support Cisco Discovery Protocol. What must be configured on the network to allow device discovery?
A. LACP
B. TFTP
C. LLDP
D. SNMP
Correct Answer: C
LLDP (Link Layer Discovery Protocol) is a vendor-neutral network discovery protocol that is used to discover the topology of a network. LLDP is similar to CDP (Cisco Discovery Protocol), but it is not proprietary to Cisco. LLDP is supported by a wide range of network devices, including switches, routers, and firewalls. To configure LLDP on a network, you must enable LLDP on the devices that you want to discover. You can then use a network management tool, such as Cisco Network Assistant, to view the topology of the network. The other options are incorrect. TFTP (Trivial File Transfer Protocol) is a network protocol that is used to transfer files between devices. LACP (Link Aggregation Control Protocol) is a network protocol that is used to aggregate multiple network links into a single logical link. SNMP (Simple Network Management Protocol) is a network protocol that is used to manage network devices.
Question 6:
Which action is required if an engineer wants to have Cisco Unified Communications Manager control the configuration for an MGCP gateway?
A. Apply the ccm-manager configuration commands to the gateway.
B. Upload the custom configuration in the TFTP server in Cisco Unified CM.
C. From Cisco Unified CM > Device > Gateway > Add gateway, check the auto-configuration check box.
D. Configure the Cisco Unified CM\’s IP in voice service VoIP.
Correct Answer: A
Question 7:
User A Calls user. The call gets connected, but the quality is bed. What are two reasons for this issue? (Choose two)
A. Incorrect partition
B. No region relationship
C. Network congestion
D. Incorrect QoS
E. Incompatible codec
Correct Answer: CD
Question 8:
Refer to the exhibit. Which codec should an engineer select for a call mode between “Dallas-REG” and “Austin-REG”?
A. MP4A-LATM
B. G.729
C. OPUS
D. G.711
Correct Answer: B
The codec preference list for the “Dallas-REG” region is “Factory Default low loss”. This list includes the following codecs in order of preference:
G.729
G.711 OPUS MP4A-LATM The codec preference list for the “Austin-REG” region is “Factory Default low loss”. This list includes the following codecs in order of preference:
G.729
G.711 OPUS MP4A-LATM Since both regions have the same codec preference list, the codec that will be used for a call made between “Dallas-REG” and “Austin-REG” is G.729. G.729 is a narrowband speech codec that was developed by the ITU-T in 1988. It is a low- bitrate codec that provides good quality speech at a bitrate of 8 kbps. G.729 is widely used in VoIP applications and is the default codec for many VoIP systems. G.711 is a wideband speech codec that was developed by the ITU-T in 1972. It is a high- bitrate codec that provides excellent quality speech at a bitrate of 64 kbps. G.711 is not as widely used as G.729 due to its high bitrate requirements. OPUS is a lossy audio codec that was developed by the IETF in 2012. It is a low-bitrate codec that provides good quality speech at a bitrate of 6 kbps. OPUS is widely used in VoIP applications and is the default codec for many VoIP systems. MP4A-LATM is a lossy audio codec that was developed by the IETF in 1999. It is a high- bitrate codec that provides excellent quality speech at a bitrate of 24 kbps. MP4A-LATM is not as widely used as G.729 or OPUS due to its high bitrate requirements.
Question 9:
Which program is required to deploy the Cisco Jabber client on an on-premises Cisco collaboration solution?
A. Cisco Unity Connection
B. Cisco Expressway-C
C. Cisco UCM
D. Cisco UCM IM and Presence
Correct Answer: C
Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/14_0/cjab_b_deploy-jabber-on-premises-14_0/cjab_b_deploy-jabber-on-premises-129_chapter_010000.html
Question 10:
Refer to the exhibit.
When making a call to a MRA client, what are the combinations of protocol on each of the different sections A-B-C?
A. IP TCP/TLS(A) +SIP TCP/TLS (B) +TLS (C)
B. SIP TLS (A) +SIP TLS (B) +SIP TLS (C)
C. SIP TCP/TLS (A) + SIP TLS (B) + SIP TLS (C)
D. SIP TCP/TLS +SIP TCP/TLS (B) + SIP TCP/TLS (C)
Correct Answer: C
https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/Cisco-Expressway-IP-Port-Usage-for-Firewall-Traversal-Deployment-Guide-X12-5.pdf
Question 11:
Which command in the MGCP gateway configuration defines the secondary Cisco Unified Communications Manager server?
A. mgcapp
B. ccm-manager fallback-mgcp
C. mgcp call-agent
D. ccm-manager redundant-host
Correct Answer: D
https://www.cisco.com/c/en/us/td/docs/ios/voice/cminterop/configuration/guide/12_4t/vc_12_4t_book/vc_ucm_mgcp_gw.html
Question 12:
Which command must be defined before an administrator changes the linecode value on an ISDN T1 PRI in slot 0/2 on an IOS-XE gateway?
A. isdn incoming-voice voice
B. pri-group timeslots 1-24
C. card type t1 0 2
D. voice-port 0/2/0:23
Correct Answer: C
Question 13:
How does WRED prevent congestion?
A. It marks which packets to drop randomly.
B. It drops packets selectively based on the IP precedence value.
C. It marks which packets to drop based on how much traffic the client sent.
D. It drops packets that have a higher DSCP value last.
Correct Answer: B
Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-10/configuration_guide/qos/b_1610_qos_9400_cg/b_1610_qos_9400_cg_chapter_010.pdf
Question 14:
What happens to voice packets from a Cisco 8845 IP phone in the QoS trust boundary?
A. The voice packets are not trusted, and the access layer switch reclassifies the packets.
B. The voice packets are classified by the phone, and the classification is accepted.
C. The phone and access layer switch negotiate the classification of packets.
D. Cisco UCM determines how the voice packets are classified.
Correct Answer: B
Reference: https://www.ccexpert.us/qos-implementing/qos-trust-boundary-in-the-lan-classify-and-mark-where.html
Question 15:
A user reports that when receiving an inbound call on their IP Phone from the PSTN they are unable to transfer this call to another PSTN number. What is the reason for this failures?
A. The IP phone is configured with the wrong region.
B. The incoming calling search space of the SIP trunk does not include the partition of the line in the IP phone.
C. The service parameter related to Offnet to Offnet Call Transfer is set to TRUE.
D. The gateway is configured with the wrong device pool.
Correct Answer: C