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Cisco CCNA Concepts & Theory > IP Services Q/A's > Flashcards

IP Services Q/A's Flashcards

1
Q

What is Quality of Service (QOS) used for?

A

prioritize data traffic

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2
Q

The standard traditional values for an acceptable video quality call for latency, jitter, loss are?

A

< 150ms Latency (delay)
< 30ms Jitter (variation in delay)
< 1% Loss

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3
Q

In packet switching data packets are sent out in what order?

A

First in First Out (FIFO)

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4
Q

When packets size limit is depleted what happens to new packets?

A

dropped

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5
Q

What is Class of service in QOS used for?

A

prioritize data traffic

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6
Q

What does NBAR stand for?

What is NBAR responsible for in QOS between layers 3 - 7?

A

Network-Based Application Recognition

deep packet inspection - marks and monitors data traffic

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7
Q

Class Based Weighted Fair Queuing is used to do what in QoS?

A

divide bandwidth amongst different classes

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8
Q

What is Low Latency Queuing used for?

A

add a strict priority to data traffic

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9
Q

Class Maps specify what two things?

A

Class name and class type

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10
Q

The service policy in QoS is also know as what type of Map?

A

Policy Map

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11
Q

Service policy in QoS can only operate when it is enabled where?

A

interface

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12
Q

What is Traffic shaping in QoS used for?

A

delaying traffic of certain threshold “buffer excess packets”

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13
Q

When the rate limit is exceeded in QOS policing what happens?

A

packets drops

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14
Q

The two things that syslogs manage are?

A

system logs and alert messages

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15
Q

The command IP helper address forwards what information, where?

A

DHCP server information to another router not within it’s own network

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16
Q

Dynamic Host Control Protocol DHCP is a centralized server that automates what?

A

auto configuration of IP addresses for hosts

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17
Q

What are the four DHCP states (DORA) in order?

A

Acronym (DORA)

DCHP Discover (Broadcast)
DHCP Offer (Unicast/Broadcast)
DHCP Request (Broadcast)
DHCP Acknowledgement
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18
Q

DNS Domain Name System is to resolve what?

A

IP address to host names

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19
Q

What port does DNS use?

A

53

20
Q

DHCP snooping inspects and stop…?

DHCP snooping is enabled needs to be enabled on a?

A

malicious DHCP packets

Trusted Port

21
Q

What information does SNMP Simple Network Management Protocol collects?

A

network monitoring and management information

22
Q

The data variable in SNMP are organized into what type of Information base?

A

(MIB) Management Information Base

23
Q

What is Per-hop behavior (PHB)?

A

packets marked with forwarding precedence

24
Q

Trivial File Transfer Protocol TFTP is used to do what with remote host?

A

send or retrieve a single files

25
Q

TFTP is more or less secure over FTP

A

Less secure

26
Q

What port is TFTP?

A

port 69

27
Q

What two things is TFTP commonly used for?

A

hardware maintenance

system updates

28
Q

Does TFTP require authentication?

A

no

29
Q

There are how many connections established using TFTP for file transfer?

A

single connection

30
Q

With FTP what two things can you do between remote hosts?

A

File transfers and uploads

31
Q

What is the control port for FTP?

What is the data port for FTP?

A

port 20

Port 21

32
Q

What layer of DSCP in QOS typically does marking occur?

A

IP Header of Layer 3

33
Q

What does DSCP stand for in Qos?

DSCP is used to do what what with network traffic?

A

Differentiated Services Code Point

classify and manage traffic

34
Q

What type of service is used by a LAN in QoS?

A

(COS) Class of Service

35
Q

QOS Capabilities Syntax X(p), T(q), Z(t) mean what?

A 
p = number of priority queues (max 1)
q = number of standard queues
t  = bandwidth thresholds

example 1p 4q 4t

36
Q

The two primary functions used by QoS in order to handle traffic are?

A

Classification and Queuing

37
Q

The type of memory buffers are used in QoS queues?

A

high-performance memory buffers

38
Q

What is the queuing scheduler called for congestion avoidance?

A

Weighted Random Early Detection (WRED)

39
Q

QoS when policing drops excess packets in what direction?

A

inbound and outbound

40
Q

How does QoS handle delayed shaped data traffic?

The direction of QoS shaping is applicable in what direction?

A

drops it

outbound direction

41
Q

CIR in QoS stand for?

The CIR from a service provider means what?

A

Committed Information Rate

Guaranteed bandwidth

42
Q

What is the formula for CIR?

What is the Bc?

What is the Tc?

A

CIR = Bc / Tc

Bc = Committed Burst number of bits for shaping or bytes for policing

Tc = Timing Interval

43
Q

What are the three sections listed in Cisco Modular Quality of Service CLI command line?

A

Class Map
Policy Map
Service Policies

44
Q

What is a Class Map?

A

type of traffic mapped to a policy

45
Q

The Policy Map is?

A

Set of defined policies

Cisco CCNA Concepts & Theory (13 decks)

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