642-845 - ONT - Optimizing Converged Cisco Networks
Go back to Cisco
Auto-Discovery and AutoQoS template generation and installation have been enabled on an interface. How will AutoQoS respond to changed made to bandwidth after the feature is configured?
Auto-Discovery phase and the QoS template deployment phase must be repeated manually.
What are the voice traffic characteristics that QoS tools can affect?
bandwidth, delay, jitter, and packet loss.
Which statement is true about the distributed call control in a VoIP network?
The VoIP endpoints have the intelligence to set up and control calls.
What is link fragmentation and interleaving (LFI)?
LFI is a Layer 2 techique in which large frames are broken into small, equal-sized fragments, and transmitted over the link in an interleaved fashion.
Which QoS mechanisms will control the maximum rate of traffic that is sent or received on an interface?
Which two statemens about the Wireless Control System (WCS) are true? (Choose two)
Initial configuration of the Cisco 2700 series appliance is done using a CLI console session.
The Cisco 2700 series appliance can collect data from radio frequency identifiers (RFID) asset tags.
Which two statements about packet marking at the data link layer are true? (Choose two)
In an 802.1q frame, the 3-bit 802.1p priority field is used to identify the class of service (CoS) priority.
The 802.1p CoS markings are preserved through the LAN, but are not maintained end to end.
Which statement best describes the Cisco 2700 Location Appliance collection of location information for wireless devices?
An AP collects RSSI information which is forwarded to wireless controllers through LWAPP. Wireless controllers forward aggregated RSSI to the location appliance through SNMP.
What are the steps for configuring stateful NBAR for dynamic protocols?
Configure a traffic class. Configure a traffic policy. Attach the traffic policy to an interface.
What is true about Quality of Service (QoS) for VPNs?
With IPsec tunnel mode, the type of service (ToS) byte value is copied automatically from the original IP header th the tunnel header.
What is the correct procedure for adding an access point in WCS?
Choose Configure > Controller, then enter the IP address of the WLC.
Which two Cisco AutoQoS configuration statements are true? (Choose two)
CEF must be enabled before configuring the auto qos discovery command.
The auto qos voip command configures the VoIP classificaiton on routers and switches.
What are two characteristics of the DiffServ model? (Choose two)
traffic that is divided into classes
QoS mechanisms that are used without prior signaling
Which two Cisco AutoQoS interface statements are true? (Choose two)
AutoQoS is supported on low-speed ATM PVCs in point-to-point subinterfaces.
AutoQoS is supported on serial PPP and HDLS interfaces.
What is a drawback to using the IntServ model?
not scalable to large implementations
What are two steps needed to define a QoS policy for a traffic class? (Choose two)
Determine a minimum bandwidth guarantee.
Assign priorities to the class.
Which two VPN protocols support QoS preclassification? (Choose two)
What two steps need to be taken in deploying AutoQoS for Enterprise on routers? (Choose two)
Generate and deploy MQC-based QoS policies.
Profile the traffic with Auto-Discovery.
What is a method for preventing general voice-quality degradation caused by too many concurent active calls?
Call Admission Control (CAC)
Which IOS feature provides dial plan scalability and bandwidth management for H.323 VoIP implementations?
Which statement about traffic policing and which statement about traffic shaping are true? (Choose two)
Traffic policing drops excess traffic in order to control traffic flow within specified rate limits.
Traffic shaping buffers excess traffic so that the traffic stays within the desired rate.
Which two IntServ functions are required on a router? (Choose two)
On it's network, Acme Corporation is using NBAR to classify applications that use well known static TCP and UDP ports. The company has recently added several applications that are not currently recognized y their NBAR implementation. A PDLM file has been downloaded to the routers to be used by NBAR for protocol matching. What action should be taken so that NBAR can use the data in the PDLM file?
Configure the routers with the global ip nbar pdlm command.
Which two statements are true about voice ports on a router? (Choose two)
Calls to the PSTN can be made via the use of FXO or T1/E1 trunk ports.
Calls between analog phones that are attached to the FXS ports in a VoIP network can be completely processed by voice-enabled routers.
What accurely describes the usage of a Cisco AutoQoS command?
On Cisco routers, the show auto qos command is used to display the AutoQoS interface templates, policy maps, class maps, and ACLs.
What are two components of the Cisco Lightweight WLAN solution? (Choose two)
Which statement is true about the ip rtp header-compression interface command used on both sides of the Frame Relay point-to-point link?
The configuration will procide header compression for voice traffic.
What are two steps that are taken when a router converts a voice signal from analog to digital form? (Choose two)
What are two features of the Wi-Fi Protected Access 2 (WPA2) standard? (Choose two)
Which Cisco IOS traffic-shaping mechanism statement is true?
Class-based policing is configured using the Modular QoS command-line (MQC) interface.
Acme Company has several offices around the country. The company has 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?
Cisco Unified CallManager Express (CME)
Which statement is true about the digital to analog conversion process?
The two steps of digital to analog conversion are decoding and filtering.
QoS preclassification is a term used to describe what Cisco IOS feature?
QoS for VPNs
SDM creates a low latency queuing (LLQ) service policy with it's associated classes. What are the two types of low latency queuing available using the SDM QoS wizard?
Priority queuing, which ensures a fixed amount of bandwidth
Bandwidth queuing, which ensures a minimum amount of bandwidth
Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic?
VPN traffic needs to be classified based on IP flow or Layer 3 information, such as source and destination IP address.
Which two statements are correct about the SDM wizard? (Choose two)
The SDM wizard can detect incorrect configurations.
The SDM wizard can propose fixes.
What is a feature of low latency queuing?
consists of a class-based weighted fair queuing with a priority queue for real-time traffic such as voice
How can a remote wireless client obtain it's Service Set Identifier (SSID)?
If a client does not have a SSID configured, it can obtain it from the AP.
Which statement is true about the functions provided by a Cisco voice gateway router?
On a voice gateway router, analog signals are converted to digital signals before the encapsulation occurs.
Which functionality in the Cisco IOS software will enable a router to permanently act as a call agent for IP phones?
Cisco CallManager Express (CME)
What is a prerequisite when configuring AutoQoS on a Cisco router?
No QoS policies can exist on the interface.
Which statement is correct about the Cisco QoS SDM wizard?
SCM QoS wizard provides real-time validation of application usage of WAN bandwidth.
Which two Cisco Wireless Control System (WCS) statements are true? (Choose two)
WCS adds a graphical view of multiple Cisco Wireless LAN controllers and managed access points.
WCS includes a network management tool which is similar to a site survey tool.
Which problem would be a cause for implementing QoS?
What are two components of the Cisco Autonomous WLAN solution? (Choose two)
Which PHB is identified in the DSCP value of 10111000?
Expedited Forwarding (EF) PHB
Which two statements about the Wireless Location Appliance are true? (Choose two)
A Wireless Location Appliance acts as a server to one or more Cisco WCSs. It collects, stores, and passes on data from it's associated Cisco WLAN controllers.
Before using the Web interface, the initial configuration of the Wireless Location appliance must be done using the command-line interface (CLI).
A stream of voice packets transmitted over a WAN network encounters differing queuing delays. One router in the path used by the voice packets delays some of the packets for 4 ms wile transmitting a large video file, but delays other packets only 2 ms. Another router delays some packets 5 ms, but transmits others in 2 ms. How would you best describe this type of problem?
What is supported by the network-based application recognition (NBAR) feature?
Which classification tool can be used to classify traffic based on the HTTP URL?
network-based application recognition (NBAR)