CICD - Questions Flashcards
What is the Policing and shaping QoS mechanism?
Enforces a rate limit based on the metering
What is the Link Efficiency QoS mechanism?
Used to improve bandwidth
What is the Classification QoS mechanism ?
Uses existing and trusted DSCP values
What is the Marking QoS mechanism ?
Based on classification, metering, or both
What is the Congestion Management QoS mechanism?
Requires all interfaces to have a queuing mechanism
What describes the FIFO algorithm?
Uses one queue only
What describes the Priority Queuing algorithm ?
Assigns each packet a priority
What describes the Weighted Fair Queuing (WFQ) algorithm?
Schedules classified interactive traffic to the front of a queue
What describes the Class-Based Weighted Fair Queuing (CBWFQ) algorithm?
Supports user-defined traffic classes
What describes the Low-Latency Queuing (PQ-CB-WFQ) algorithm ?
Uses a priority queue for voice traffic at a guaranteed rate
What QoS characteristics correspond to the Best-effort QoS model ?
The default QoS model for all router models when no QoS is deployed
What QoS characteristics correspond to the INTSERV QoS model ?
A multiple-service model that can accomodate multiple QoS requirements
Applications reserve bandwidth for a specific time
What QoS characteristics correspond to the DIFFSERV QoS model ?
Provides an “almost guaranteed” QoS
Also known as “soft QoS”
Identify the characteristics of using LFI in your network.
Reduces queuing delay and jitter by expediting the transfer of smaller frames through the Tx queue
LFI methods include MLP and FRF.12 and FRF.11 Annex C
Voice quality is directly affected by three QoS factors. What describes the JITTER quality factor ?
Late or out-of-order packets end up being discarded. Playout buffers are used to balance the delay and the probability of interrupted playout due to late packets
Voice quality is directly affected by three QoS factors. What describes the LOSS quality factor ?
Causes voice clipping and skips and is corrected with the industry-standard CODEC used in Cisco digital processors (DSPs)
Voice quality is directly affected by three QoS factors. What describes the LATENCY/DELAY quality factor ?
Can cause voice quality degradation and should be held to 150 ms for one-way, end-to-end transmission
RTP header compression can benefit both telephony voice and multicast backbone applications. In what situation is using RTP header compression not recommended ?
On high-speed interfaces
Identify the QoS considerations within a converged network.
Packets cannot tolerate more than a 150-ms delay
Videoconferencing streams would require the actual bandwidth of the stream plus an additional 20%
Identify the issues facing converged enterprise networks.
Scarce bandwidth
Delay issues
Jitter
Packet loss
Which of the following are characteristic descriptions for multisite Cisco Unity Connection deployment?
Uses the G.729 codec
Requires traffic pattern evaluations
Makes use of transcoding
What are the functions of the FXS analog voice port ?
Connect router to end-user equipment
Provides ring, power and dial tones
What are the functions of the FXO analog interface ?
Connect a trunk to a PSTN or to a PBX
Makes and receives calls from the PSTN
Identify features of voicemail user CoS
Timers are used to define recording times
Licensed and cost-generating features are disabled by default
Call Transfer for outgoing or transferred calls can be restricted
What CoS configuration elements are used for calling privilege implementation?
Client Matter Codes
Time Schedules and Periods
Forced Authorization Codes
What is the purpose of Call Admission Control (CAC) in a multisite deployment interconnected by an IP WAN ?
Used to limit the number of voice calls and maintain the bandwidth limits
What are the characteristics of a Interview Call Handler ?
Allows the system to ask the caller questions and records the answers
What are the characteristics of a Directory Call Handler ?
Allows callers to search for users on the Cisco Unity Connection system
What can be said over DEFAULT DIAL-PEER ?
They are used for Inbound matches only
They will fail to negociate non-default capabilities or services
Should not be used because it marks TRAFFIC AS IP PREFERENCE 0. No QoS !
How many Dial-Peers will be requiered when someone sends a call to a router ?
At least 2; one INCOMING and one OUTCOMING
When multiple potentially matching patterns are present how is the destination pattern chosen
It uses closest-match logic to select the best destination pattern
It matches the dial string
What is the Translation Pattern ?
Interpret a dialed number and then look up the interpreted number in the call routing table
Which statements are valid concerning Dial-Peer preferences ?
Range is 0 to 10
A preference of 6 is preferred to a preference of 8
What are the requiered parameters when manually creating a new user in Cisco Unity Connection ?
Alias
Extension
Which profiles can be assigned to a device or a device pools ?
Security Profile
Common Phone Profile
Which of the following components of CUC uses the IBM Informix database for configuration data ?
Cisco Unity Directory
Identify true statements regarding VoIP signaling protocols
MGCP is an IETF standard for PSTN gateway control and makes use of a centralized dial plan
SCCP and SIP are two signaling methods used between IP phones and CUCME
Which service provides device configuration files, ringer files and firmware upgrades to the IP phones ?
TFTP Server
Which statements about message aging policies are true ?
If message aging rules are selected, the Enable checkbox must be checked to cause the rules to be enforced
Message aging rules should be used with caution as voice messages can be deleted without the user ever knowing that message existed
In Line Groups, what distribution algorithms are available ?
Top Down
Circular
Longest Idle Time
Broadcast
Identify the considerations when setting up the LDAP system for importing users from LDAP into Cisco Unity Connection.
The LDAP server type must be specified
The user ID attribute for LDAP integration must be specified
Identify the considerations when importing in CUC end users from LDAP
The Cisco AXL Web Service must be activated on CUC
The LDAP setup includes specifying a server type as well as a user attribute
What features are supported by CUCM DHCP ?
Can service IP phones only, not other network devices such as PCs
Various clusters can share one CUCM DHCP server
Identify the features of CUCM High Availability
There can be up to 30.000 IP phones in a cluster
There can be up to 8 subscribers running the Cisco Call Manager Service
There can be up to 3 subscribers running in a Unified CM Group
There can be up to 2 servers running the TFTP Service
A Unified CM cluster may contain as many as 20 server nodes, of which a maximum of eight call processing subscribers (nodes running the Cisco CallManager Service) are allowed. The other server nodes within the cluster may be configured as a dedicated database publisher, dedicated TFTP subscriber, or media resource subscriber.
Identify the features of CUC High Availability
Support a two-server active-active pair
The designated primary node has ownership of the database and message store
What are the key features of CUC Manager Express?
Conferencing support
Support for Tcl scripts
Supports the Cisco Telephony Application Programming Interface
Runs directly on Cisco IOS software
What are features of Cisco Unity Express?
Provides voicemail features
IVR support
Supports SRSV
Identify key features of Cisco Unified Presence
Supports peer-to-peer transfers
Supports Cisco Unified Mobility integration
Uses XCP to implement interdomain federation
Identify the key features of Cisco Unified Communications Manager
Provides a Disaster Recovery System through the use of the Disaster Recovery Framework
Supports configuration via GUI rather than through the CLI
The hardened OS only allows access to Cisco authorized applications and utilities for increased security
What special functions are used by Cisco IP phones ?
CDP
TFTP
DHCP
The Cisco Unified Communications Manager utilizes configuration elements to implement calling privileges or class of service. What are the characteristics of the Partitions?
Group of numbers with similar reachability characteristics
Which function of CUBE provides privacy and topology hiding ?
Address and port translation
In CUCM, What service needs to run for Phone activation ?
- Cisco Call Manager
- Cisco TFTP
In CUCM, which templates are requiered to get Phone Auto-Registration ?
- Universal Device Template
- Universal Line Template
How is the IP phone DHCP configuration process accomplished?
All servers on the voice VLAN will receive the DHCP request
The DHCP server responds with TFTP server address and default gateway
What are the functions of the Route pattern?
Matches dialed number for external calls
Points to a route list for routing
Auto-registration is a way to simplify the addition of IP phones to the CUC Manager database. Identify the features of auto-registration.
Existing IP phones are not affected
Supported by all Cisco IP phones
Uses default settings and random directory numbers
What are the functions of a Route group?
Second level of path selection
Points to the actual device
There are several different methods for implementing IP phones using CUC Manager. What are advantages and disadvantages to using auto-registration?
Default settings and random DNs are used
Devices automatically added and assigned extensions from a pool
Modifications required after registration
You work in an office environment that has implemented an IP phone infrastructure. What happens if you are on an active call with a co-worker (user B) and another individual (user C) tries to reach you using your intercom line?
User B will not hear the voice of user C
You will hear a mixture of both audio streams
The IP phone downloads a device-specific configuration file at startup time from the TFTP server. What happens if a device-specific file is not available?
The phone requests the XMLDefault.cnf.xml file