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?

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
TFTP is more or less secure over FTP
Less secure
26
What port is TFTP?
port 69
27
What two things is TFTP commonly used for?
hardware maintenance | system updates
28
Does TFTP require authentication?
no
29
There are how many connections established using TFTP for file transfer?
single connection
30
With FTP what two things can you do between remote hosts?
File transfers and uploads
31
What is the control port for FTP? What is the data port for FTP?
port 20 Port 21
32
What layer of DSCP in QOS typically does marking occur?
IP Header of Layer 3
33
What does DSCP stand for in Qos? DSCP is used to do what what with network traffic?
Differentiated Services Code Point classify and manage traffic
34
What type of service is used by a LAN in QoS?
(COS) Class of Service
35
QOS Capabilities Syntax X(p), T(q), Z(t) mean what?
``` p = number of priority queues (max 1) q = number of standard queues t = bandwidth thresholds ``` example 1p 4q 4t
36
The two primary functions used by QoS in order to handle traffic are?
Classification and Queuing
37
The type of memory buffers are used in QoS queues?
high-performance memory buffers
38
What is the queuing scheduler called for congestion avoidance?
Weighted Random Early Detection (WRED)
39
QoS when policing drops excess packets in what direction?
inbound and outbound
40
How does QoS handle delayed shaped data traffic? The direction of QoS shaping is applicable in what direction?
drops it outbound direction
41
CIR in QoS stand for? The CIR from a service provider means what?
Committed Information Rate Guaranteed bandwidth
42
What is the formula for CIR? What is the Bc? What is the Tc?
CIR = Bc / Tc Bc = Committed Burst number of bits for shaping or bytes for policing Tc = Timing Interval
43
What are the three sections listed in Cisco Modular Quality of Service CLI command line?
Class Map Policy Map Service Policies
44
What is a Class Map?
type of traffic mapped to a policy
45
The Policy Map is?
Set of defined policies