DANTE Level 2 exam questions and answers(graded A+).

DANTE Level 2 exam questions and answers(graded A+). A Dante system is running on a converged enterprise network. Clocking and discovery are working OK, but audio only passes in unicast. You conclude that a firewall is blocking your multicast audio packets. What port would you ask the IT administrator to unblock? UDP 146 TCP 443 UDP 5353 UDP 4321 - Correct Answer UDP 4321 If 5 unicast channels are sent between two devices, how much bandwidth, and how many flows are being used? (sample rate 48KHz/24-bit) - Correct Answer 12 mbps, and 2 flows Dante media clock synchronization is more accurate than _____ between any two devices on the network (Select the most accurate variance we guarantee) - Correct Answer 1 micro sec If 3 channels are being sent within 1 unicast flow, how much bandwidth is being used? (sample rate 48KHz/24-bit) 4mbps 8mbps 2mbps 6mbps - Correct Answer 6mbps Routers do not use IP addresses- they only use MAC addresses. TRUE FLASE - Correct Answer FALSE On a Unicast transmission, a transmitter and receiver have latency settings of 0.25 msec and 1.00 msec, respectively. When will the audio playout of the receiving device? 1 milli seconds - Correct Answer 1 milli seconds A Dante device can have an unlimited number of receive flows. - Correct Answer FALSE It is a best practice (and strongly suggested) to designate unique IP subnets to each VLAN. Among other things, you'll be able to use a router to connect the devices across VLANs (via unicast). - Correct Answer TRUE How much bandwidth does a unicast audio flow use? (Assume 48kHz, 24-bit.) - Correct Answer 6mbps A multicast flow is initiated by a transmitter alone. - Correct Answer TRUE A switch populates its ________ by observing the source __________ of ARP requests and responses passing through. - Correct Answer Mac Address Table MAC Addresses IGMP snooping listens for reports to __________ messages in order to restrict __________ traffic. - Correct Answer IGMP query, multicast The amount of bandwidth used by a multicast flow varies based on number of transmitting channels. - Correct Answer FALSE When you know you will be configuring switches with features like IGMP Snooping, there is no hesitation in combining managed switches from different manufacturers in your design. - Correct Answer FALSE How can you find out how many transmit flows a device is using? - Correct Answer In Dante Controller, go to Device View, Tx tab Dante devices automatically change unicast flows to multicast when a fan-out is detected. - Correct Answer FALSE A Dante system is using a mix of Brooklyn II (1Gbps) and Ultimo (100Mbps) devices. The system has run continuously for at least 5 days, though system operators suggest they hear occasional sound distortions. You notice audio multicast bandwidth has accumulated to 90Mbps. What would be the potential solution for this? - Correct Answer Turn on IGMP Snooping When a system will implement redundant networks, the preferred method for commissioning is: - Correct Answer Bring one network online at a time, ensuring devices are property set for redundant and you have the expected operation on each network. Once you are satisfied, bring both networks online together. Diffserv QoS uses ______ tags. - Correct Answer DSCP A firewall can either permit or block a/an IP address or a port on a particular transport protocol. - Correct Answer FIREWALL, IP Address A unicast flow is created by a transmitter alone. - Correct Answer FALSE Your Dante network is working great. Dante Controller works fine on one computer, but another computer only shows device names... even when you use the same network cable/port for each computer. What are potential cause(s) of this? - Correct Answer All Above The Above DSCP stands for.... - Correct Answer Distributed Services Code Point You have a new device with a Brooklyn II module, capable of transmitting 64 channels. What is the minimum number of flows needed to transmit all 64 audio channels in unicast to a single receiving device? - Correct Answer 16 flows A network session is, - Correct Answer an instance when a connection between two devices is created to transfer data ARP stands for: - Correct Answer Address Resolution Protocol Consider the OSI model in terms of packet creation as it travels down through the stack. An application has a port/socket address which pertains to a transport protocol, which in turn is encapsulated into a packet, which has a/an _____________ which is then encapsulated into an Ethernet frame which has a/an ____________. - Correct Answer IP Address MAC Address DNS resolves _______ to IP addresses. ARP resolves _______ to MAC addresses. - Correct Answer Names IP Addresses What protocol does Dante use to assign IP addresses to devices? (select all that apply) - Correct Answer DHCP IPv4-Link Local OSI model is a __________. - Correct Answer Conceptual model How many channels are contained in a Multicast Flow? - Correct Answer Up to 8 A network solution allows a group of devices to connect and can interoperate together. - Correct Answer TRUE A ________ segments a broadcast domain. - Correct Answer router What is the maximum number of channels that may be contained in a unicast flow? - Correct Answer 4 How is a unicast flow created in a Dante network? After the user designates a subscription, a control message is sent to... - Correct Answer the receiver, asking it to request specific channels from a transmitter. In a _________ transaction, bandwidth is only used between a Dante transmitter and receiver when an active subscription is made. - Correct Answer Unicast What steps should be taken in order to segment a broadcast domain? - Correct Answer Establish VLANs to break the network in to groups - broadcast traffic does not cross the VLAN. Generally speaking (and by default), a router will not pass: (select all that apply) - Correct Answer Multicast traffic Broadcast traffic A multicast router or a __________ is required to make _________ function in the network - Correct Answer querier IGMP When a Dante enabled device is plugged into a network, how does Dante Controller discover it? - Correct Answer -By listening to the device's announcement using mDNS Dante Controller provides a diagnostic graph for checking the __________ of flows between two devices. - Correct Answer latency Dante is an example of a ________________ network service - Correct Answer Real-time Dante requires strict priority queuing when QoS is used. - Correct Answer TRUE Communicating between devices from different VLANs requires a router. This comes in many forms, from a hardware router to a router configured within a Layer 3 switch. - Correct Answer TRUE After setting up the network, you open Dante controller. You notice that one device's name appears in Dante Controller, but other control and status information is not available. What is the likely cause of this issue? - Correct Answer Device is in a different IP subnet than the Dante Controller computer. What is the key aim of a network service? - Correct Answer Interoperability QoS protects against too much bandwidth being used on a link by a collection of systems. Even if the overload happens over an extended period of time, packets are delivered in a timely manner, regardless of their QoS priority queue. - Correct Answer FALSE Higher link speeds allow frames to be cleared quicker through an interface. - Correct Answer TRUE A reply to ARP whohas message is - Correct Answer Unicast Switches look at - Correct Answer Destination MAC addresses to forward frames Based on what we know about different transmission methods, which type of traffic would we expect to find on the public internet? - Correct Answer Unicast Key resource considerations for a successful Dante network should address network infrastructure and the Dante hardware for the project. Designers should consider: (select all that apply) - Correct Answer -Enough bandwidth within the switch -Enough Tx flows in Dante devices -Enough Rx flows in Dante devices -Enough bandwidth on trunk lines A VLAN tag is part of the 802.1 header at layer _____. - Correct Answer 2 It is highly recommended for the backplane of a switch to be able to accommodate full bandwidth use of all ports in both directions. - Correct Answer TRUE In Dante Controller's Clock Status tab, you see reports of more than one clock master. The Dante Controller Log also shows devices reporting sync loss occasionally. What steps would you take to find the root cause of the problem? (SELECT ALL THAT APPLY) - Correct Answer -Check switch configurations for any evidence of ACLs being configured. Check that all PTP traffic can traverse the network in both directions to all switches. Specifically, UDP ports 319 and 320 on 224.0.1.129 -If IGMP snooping is enabled, test the system with no audio and IGMP snooping turned off. If this resolves the problem, you carefully examine the IGMP snooping configuration in each switch and ensure that they follow the guidelines. 32 multicast IP addresses map to one multicast MAC address. - Correct Answer TRUE You have a Dante system that seems to be functioning correctly most of the time. There are no external word clocks configured and no preferred master configured. The problem: several devices that report they are losing sync occasionally. What steps would you take to find the root cause of the problem? (Select all the apply) - Correct 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 engaged, the switch CPU may be insufficient to meet the demand. Try turning IGMP snooping off, and watch histograms again (taking in to account devices that might now be flooded with multicast traffic.) Or, try selecting "Enable Unicast Delay Requests" to reduce the multicast load on IGMP snooping. To start a multicast flow in Dante Controller, a control message is sent to... - Correct Answer the transmitter, asking it to start transmitting the media stream for any device on the network to request. On a Unicast transmission, a transmitter and receiver have latency settings of 2msec and 1msec, respectively. When will the audio playout of the receiving device? - Correct Answer 2 milli Network bandwidth is measured in: - Correct Answer bps On a Unicast transmission, a transmitter and receiver have latency settings of 4msec and 2msec, respectively. When will the audio playout of the receiving device? - Correct Answer 4 milli second Requirements of Dante are completely satisfied by a COTS (Commercial Off The Shelf) infrastructure - Correct Answer TRUE If two different devices try to transmit to a common device at the same time, switches suffer from a problem in the collision domain. The packets are not readable and, in effect, dropped. The original transmitters each wait a random amount of time to retransmit in hopes of having a clear path. This is a common problem in modern network switches. - Correct Answer FALSE A switch connects its interfaces together by referencing its - Correct Answer MAC address table An ARP whohas message is: - Correct Answer Broadcast In a production network, multicast management is more critical than QoS - Correct Answer TRUE Dante uses ______ for clocking. - Correct Answer PTP To stop multicast traffic from flooding the network, __________ can be used. - Correct Answer IGMP A unicast Dante flow allows for the use of much lower latency settings than a multicast flow - Correct Answer TRUE Dante uses ______ DSCP tags for QoS. - Correct Answer 3 Detailed understanding of the OSI model is required to design a Dante network. - Correct Answer FALSE Which of the following should be considered when building a network from scratch: - Correct Answer Sizing trunk lines for worst case traffic loads A transmit flow is a sequence of packets from multiple port addresses. - Correct Answer FALSE Multicast streams use a specific IP range of: - Correct Answer 224.0.0.0/4 From the perspective of link bandwidth, unmanaged multicast traffic behaves like: - Correct Answer Broadcast When using QoS, Dante is best used on switches with at least _____ queues. - Correct Answer 4 You have a four-channel Dante to analog output device which uses the Ultimo chip. Which of the following subscriptions are valid? (select all that apply) - Correct Answer -Subscribing two channels each from two different transmitting devices. -Subscribing four channels from a single transmitting device. -Subscribing three channels from a single transmitting device and a one channel from another. Multicast traffic can take more time to pass through a switch when IGMP snooping is enabled. - Correct Answer TRUE ARP tables are held in nodes (e.g. - Dante devices, laptops, and other network endpoints). - Correct Answer TRUE When you assign a channel that is already being sent unicast to a multicast flow: - Correct Answer Existing unicast flow converts to multicast Besides separate cabling and switching hardware, a ________ can be used to separate broadcast domains: - Correct Answer VLAN In a ___________ transaction bandwidth is only consumed on the _______ path between a receiver and a transmitter. - Correct Answer unicast Shortest You are the AV Manager for a facility with four unique venues. All venues are in one common LAN, and techs in each venue are "seeing" devices in other venues. You decide this visibility could cause security concerns - perhaps more from honest mistakes than sabotage. Using device lock to secure devices too cumbersome for these venues, which need to change patching on a regular basis. What is the likely solution that can remedy this problem? (Select all that apply.): - Correct Answer Set up a VLAN for each venue. Use Dante Domain Manager to segment each venue to a domain. (You can even do this on a single subnet without changing the switch configuration) PTP sync traffic is the most time critical traffic in a Dante network and is tagged with DSCP ______. - Correct Answer 56 The Multicast Bandwidth indicator in Dante Controller keeps track of: - Correct Answer The amount of audio multicast traffic that you've created on the Dante network. Dante flows are multicast by default. - Correct Answer False Giving an external word-clock to a Dante device replaces all internal clocking mechanisms. TF? - Correct Answer False QoS can protect Dante's time critical services from temporary bandwidth spikes coming from other traffic on the network. - Correct Answer TRUE Which one of the following situations may call for QoS to be turned on? (select all the apply) - Correct Answer Using Dante on a 100 MB network Dante being used on an enterprise network with multiple, independent services on it. QoS will not have a positive effect on constant bandwidth services. - Correct Answer TRUE All managed switches come from the factory with all of their configuration settings disabled? - Correct Answer FALSE Switches can have multiple MAC addresses mapped to a port in their MAC address table - Correct Answer TRUE Dante devices have a maximum number of flows - Correct Answer TRUE Switches can _________ data if two devices are transmitting to the same destination at the same time. - Correct Answer queue