Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

CTY L6 Review > VoIP Final > Flashcards

VoIP Final Flashcards

1
Q

IP guarantees reliability, flow control, and error detection/correction (T/F)

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

TCP overhead for reliability is large and consumes bandwidth (T/F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

UDP offers reliability (T/F)

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

RTP makes it possible to identify type of information carried, add markers/sequence numbers, and monitor packets (T/F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

RTCP makes it possible to convey packet count/delay/loss and jitter (T/F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

RTP Header size?

A

12 bytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

UDP Header size?

A

8 bytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

IP Header size?

A

20 bytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Frame Header size?

A

18 bytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

By default, 20ms of voice is packetized into a single IP packet (T/F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

G.729 Payload size?

A

20 bytes (1/2 the headers)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

G.711 Payload size?

A

160 bytes (4x the headers)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the order of CUC integration using SIP?

A

Voicemail profile -> Voicemail pilot -> Route pattern -> SIP trunk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the two basic call types for CUCM routes?

A

On-Net Calls - Destination DN is registered with CUCM

Off-Net Calls - External Route Patterns must be configured on CUCM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

CUCM is more complex than CME because it is a distributed scalable system (T/F)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

CUCM is not intended for large-enterprise environments (T/F)

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What are the elements of a CUCM Dial-Plan?

A

Route Patterns - match a string of dialed digits
Route Lists - ordered list of route groups
Route Groups - list of devices configured to support circuits to the PSTN
Gateways / Trunks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is MGCP?

A

Media Gateway Control Protocol, for controlling media gateways on IP networks connected to the PSTN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the components of MGCP?

A

Gatekeeper (Call agent)

Gateway (Connects POTS phones or PSTN-b-channels to an IP network)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the 4 ways to add phones in CUCM?

A

Manual configuration
Auto-registration
Bulk Administration Tool (BAT)
Auto Register Phone Tool (TAPS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are the special functions and services used by IP phones?

A

NTP, CDP/LLDP, PoE, DHCP, TFTP, DNS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are the minimal tasks for preparing CUCM?

A
  1. Configure and verify network services
  2. Configure enterprise parameters
  3. Configure service parameters
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What tools need to be activated for CU serviceability?

A

CallManager
DHCP Monitor Service
TFTP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the CUCM Serviceability Interface?

A

Web-based troubleshooting tool. The Tools menu allows to stop, start or restart services.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
The CUCM Administration Interface is where most telephony management is done (T/F)
True
26
The CUCM OS Administration Interface allows an administrator to monitor and interact with the Linux-based operating system (T/F)
True
27
What does the command "priority bandwidth" do?
Allocates a fixed bandwidth to a class and ensures fast forwarding. Traffic which exceeds it is dropped if congestion exists.
28
What does the command "priority percent percentage" do?
Allocates a percentage of configured/default bandwidth to a class and ensures fast forwarding. Traffic which exceeds it is dropped if congestion exists.
29
What does a policy map do?
Defines a traffic policy which configures the QoS features associated with a traffic class previously identified.
30
What are the 3 major elements of a traffic policy?
1. Case sensitive name 2. Traffic class (class-map reference) 3. QoS policy associated with the traffic class
31
What are the 3 major elements of a traffic class?
1. Case sensitive name 2. Match commands 3. Instructions on evaluating match commands
32
What are the 2 modes class maps operate in?
``` Match all (default): all conditions have to succeed Match any: at least one condition must succeed ```
33
What are the 3 steps for defining an overall QoS policy?
1. Define classes (class map) 2. Define QoS policies for classes (policy map) 3. Apply a service policy
34
What is the MQC CLI?
Modular Quality of Service CLI. Allows you to define a traffic class, create policy, and attach the policy to an interface.
35
For scalability, classification should be enabled as close to the edge as possible, depending on device capabilities (T/F)
True
36
What is NBAR2?
Network-Based Application Recognition. An intelligent classification engine that classifies applications and discovers what traffic is running on the network.
37
What does NBAR2 provide?
Bidirectional, per-interface and per-protocol statistics
38
What is sub-port c;assification?
NBAR's method of classifying application traffic by looking into the TCP/UDP payload itself and classify based on content.
39
NBAR requires CEF to be enabled before protocol discovery (T/F)
True
40
NBAR2 HTTP-Based Visibility Dashboard provides a web interface displaying network data and related information (T/F)
True
41
What is a protocol pack?
A set of protocols developed and packaged together.
42
What are the benefits of WFQ?
Simple configuration Guarantees some throughput to all flows Drops packets of most aggressive flows
43
What are the drawbacks of WFQ?
Possibility of multiple flows ending up in one queue Lack of control over classification Cannot provide fixed bandwidth guarantees
44
What is CBWFQ?
Class-based Weighted Fair Queuing. A mechanism used to guarantee bandwidth to classes and extends WFQ functionality.
45
CBWFQ guarantees bandwidth according to weights assigned to classes (T/F)
True
46
CBWFQ weights are calculated from bandwidth or a percentage (T/F)
True
47
What are the ways bandwidth can be defined?
Bandwidth (kbps) Percentage of bandwidth (% of available interface bandwidth) Percentage of remaining available bandwidth
48
One service policy can have mixed types of weights (T/F)
False
49
What are the benefits of CBWFQ?
Custom-defined classifications Minimum bandwidth allocation Finer granularity and scalability
50
What are the drawbacks of CBWFQ?
Voice traffic can still suffer unacceptable delay (no priority)
51
What is LLQ?
Low latency queuing. Combines priority queuing and CBWFQ to create more versatile queuing mechanisms.
52
Long transmit queue
May result in poor performance of the software queuing system
53
Short transmit queue
May result in a large number of interrupts which causes high CPU utilization and low link utilization
54
What are the 3 QoS models?
``` Best effort (default) Integrated Services (IntServ) Differentiated Services (DiffServ) ```
55
What is DSCP?
Differentiated Services Code Points
56
What is a QoS service class?
A logical grouping of packets that are to receive a similar level of applied quality
57
What is FIFO?
First-In, First-Out Queuing. Involves storing packets when the network is congested and forwarding in order of arrival when no longer congested.
58
What is PQ?
Priority Queuing. Puts data into four levels of queues: high, medium, normal (default) and low.
59
What is CQ?
Custom queuing. Handles traffic by assigning a specified queue space to each packet class and servicing up to 17 queues in round-robin.
60
What is WRED?
Weighted Random Early Detection. Provides a method that stochastically discards packets if increased congestion.

CTY L6 Review (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions