Dante Level 3
SCENARIO: You have a Dante system that seems to be functioning correctly, there are
no external word clocks configured, no preferred master configured, but there are still a
number of devices that report they are losing sync occasionally. What steps would you
take to find the root cause of the problem? - answer-You suspect that multicast traffic is
not able to traverse the network in both directions (i.e. from master to all slaves, and
from all slaves to the master). To check if this is the case you enable unicast delay
requests on the slaves, then monitor the clock status histogram for evidence of
disruption in PTP. When this resolves the problem you suspect that ACLs blocking
multicast on UDP ports 319 and 320 in a direction from the slave to the master is to
blame.
-If IGMP Snooping is enabled, you test the system with no audio and IGMP Snooping
turned off. When this resolves the problem you suspect that IGMP snooping has been
interfering with the distribution of multicast traffic between the slaves and the master.
You enable unicast delay requests on all slaves to reduce the amount of multicast traffic
that the switches need to track via IGMP.
Switches look at ________ - answerDestination MAC addresses to forward frames
Things to consider when building a network from scratch: - answerSizing links for worst
case traffic loads
Dante automatically changes a unicast flow to a multicast flow when necessary. -
answerFalse
Dante uses ______ DSCP tags. - answer4
Apart from separate cabling, a ________ can be used to separate broadcast domains. -
answerVLAN
In a [________] transaction bandwidth is only consumed on the [________] path
between a receiver and a transmitter. - answerunicast, shortest
A session is ________ - answeran instance when a connection between two devices is
created to transfer data
A Dante device can have an unlimited number of receive flows. - answerFalse
How do you find out how many transmit flows you are using? - answerTx tab in Dante
controller
, An ARP whohas message is ________ - answerBroadcast
Giving an external word-clock to a Dante device replaces its internal clock. -
answerFalse
IGMP snooping listens for reports to [________] messages in order to restrict
[________] traffic. - answerIGMP query, multicast
ARP tables are held in nodes - answerTrue
Match these layer numbers to the corresponding layer names in the OSI model: -
answerLayer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Datalink
Layer 1 - Physical
Dante devices have a set number of flows. - answerTrue
A Dante receiving device has a latency setting of 1ms. A Dante transmitting device has
a latency setting of 250µs. If a subscription is created between these units, when will the
audio playout of the receiving device? - answer1 milli seconds
Sync traffic is the most time critical traffic in a Dante network and is tagged with DSCP
______. - answer56
How many channels are contained in a Multicast Flow? - answerUp to 8
The BEST way to bring up a redundant network online is: - answerBring the primary
network online first, ensure all devices appear functional, check that devices are
configured to operate in redundant mode, then bring the secondary network online.
What steps need to be taken in order to segment a broadcast domain? (select all that
apply) - answer-Put the same type of devices into a VLAN
-Define VLAN as an IP subnet
SCENARIO: You notice that audio on your Dante network is not working as it should,
but only when multicast transmission is configured for audio. Your audio network is on a
converged enterprise network. After testing your Dante network, you conclude that a
firewall is dropping your multicast packets. What port would you ask the IT administrator
to unblock? - answerUDP 4321
A unicast flow is created by a transmitter alone. - answerFalse
SCENARIO: You have a Dante system that seems to be functioning correctly, there are
no external word clocks configured, no preferred master configured, but there are still a
number of devices that report they are losing sync occasionally. What steps would you
take to find the root cause of the problem? - answer-You suspect that multicast traffic is
not able to traverse the network in both directions (i.e. from master to all slaves, and
from all slaves to the master). To check if this is the case you enable unicast delay
requests on the slaves, then monitor the clock status histogram for evidence of
disruption in PTP. When this resolves the problem you suspect that ACLs blocking
multicast on UDP ports 319 and 320 in a direction from the slave to the master is to
blame.
-If IGMP Snooping is enabled, you test the system with no audio and IGMP Snooping
turned off. When this resolves the problem you suspect that IGMP snooping has been
interfering with the distribution of multicast traffic between the slaves and the master.
You enable unicast delay requests on all slaves to reduce the amount of multicast traffic
that the switches need to track via IGMP.
Switches look at ________ - answerDestination MAC addresses to forward frames
Things to consider when building a network from scratch: - answerSizing links for worst
case traffic loads
Dante automatically changes a unicast flow to a multicast flow when necessary. -
answerFalse
Dante uses ______ DSCP tags. - answer4
Apart from separate cabling, a ________ can be used to separate broadcast domains. -
answerVLAN
In a [________] transaction bandwidth is only consumed on the [________] path
between a receiver and a transmitter. - answerunicast, shortest
A session is ________ - answeran instance when a connection between two devices is
created to transfer data
A Dante device can have an unlimited number of receive flows. - answerFalse
How do you find out how many transmit flows you are using? - answerTx tab in Dante
controller
, An ARP whohas message is ________ - answerBroadcast
Giving an external word-clock to a Dante device replaces its internal clock. -
answerFalse
IGMP snooping listens for reports to [________] messages in order to restrict
[________] traffic. - answerIGMP query, multicast
ARP tables are held in nodes - answerTrue
Match these layer numbers to the corresponding layer names in the OSI model: -
answerLayer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Datalink
Layer 1 - Physical
Dante devices have a set number of flows. - answerTrue
A Dante receiving device has a latency setting of 1ms. A Dante transmitting device has
a latency setting of 250µs. If a subscription is created between these units, when will the
audio playout of the receiving device? - answer1 milli seconds
Sync traffic is the most time critical traffic in a Dante network and is tagged with DSCP
______. - answer56
How many channels are contained in a Multicast Flow? - answerUp to 8
The BEST way to bring up a redundant network online is: - answerBring the primary
network online first, ensure all devices appear functional, check that devices are
configured to operate in redundant mode, then bring the secondary network online.
What steps need to be taken in order to segment a broadcast domain? (select all that
apply) - answer-Put the same type of devices into a VLAN
-Define VLAN as an IP subnet
SCENARIO: You notice that audio on your Dante network is not working as it should,
but only when multicast transmission is configured for audio. Your audio network is on a
converged enterprise network. After testing your Dante network, you conclude that a
firewall is dropping your multicast packets. What port would you ask the IT administrator
to unblock? - answerUDP 4321
A unicast flow is created by a transmitter alone. - answerFalse
