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LDCE Wireline > WiFi,LiFi,ADSL,IMS > Flashcards

WiFi,LiFi,ADSL,IMS Flashcards

1
Q

IEEE 802.11operates in
1) frequency hopping spread spectrum (FHSS)
2) direct sequence spread spectrum (DSSS)
3) either 1 or 2

A

3) either 1 or 2

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2
Q

IEEE 802.11operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz

A

2.4GHz

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3
Q

IEEE 802.11a operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz

A

5GHz OFDM 54Mbps
IEEE 802.11b in 2.4GHz DSS 11Mbps

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4
Q

IEEE 802.11b operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz

A

2.4GHz DSS 11Mbps
IEEE 802.11a in 5GHz OFDM 54Mbps

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5
Q

IEEE 802.11g operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz

A

2.4GHz OFDM 54Mbps

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6
Q

IEEE 802.11n operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz
4) dual 2.4GHz, 5GHz

A

dual 2.4GHz, 5GHz
2.4GHz MIMO-OFDM 100Mbps
MIMO introduced in IEEE 802.11n

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7
Q

IEEE 802.11ac operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz
4) dual 2.4GHz, 5GHz

A

5GHz, but supports dual band by backward compatibility
uses MIMO, QAM
called WiFi-5
1300mbps on 5 GHz (plus 450 Mbps on 2.4 GHz ?)
802.11ac only specifies operation in the 5 GHz band. Operation in the 2.4 GHz band is specified by 802.11n.

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8
Q

IEEE 802.11ax operates in ____
1) 2.4GHz
2) 5GHz
3) 6GHz
4) dual 2.4GHz, 5GHz

A

dual 2.4GHz, 5GHz
uses MIMO, QAM
called WiFi-6

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9
Q

WiFi power consumption is comparatively ______ (high/low) compared to other standards

A

high

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10
Q

TRAI defines broadband minimum speed
1) 256 kbps
2) 512 kbps
3) 1 mbps
4) 2 mbps

A

2 mbps
Wired broadband and wireless broadband will both be subject to this 2Mbps limit.

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11
Q

DSLAM stands for

A

Digital Subscriber Line Access Multiplexer

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12
Q

ADSL stands for

A

Asymmetric Digital Subscriber Line

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13
Q

VDSL stands for

A

Very High-Speed Digital Subscriber Line

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14
Q

RADSL stands for

A

Rate Adaptive Digital Subscriber Line

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15
Q

HDSL stands for

A

High Data-Rate Digital Subscriber Line

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16
Q

SDSL stands for

A

Symmetric Digital Subscriber Line

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17
Q

ADSL2+ uses 1.1MHz to 2.2MHz for
1) upstream
2) downstream

A

downstream. This doubles the downstream data rates of the previous ADSL2 standard.

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18
Q

ADSL2+ downstream data rates up to
1) 12 Mbit/s
2) 24 Mbit/s

A

24 Mbit/s
ADSL2 has 12 Mbit/s
ADSL has 8 Mbit/s

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19
Q

________ assigns the upstream band to over-lap the downstream in ADSL
1) modulation
2) Echo cancellation

A

Echo cancellation

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20
Q

Echo cancellation is common in V.32 and V.34 modems (T/F)

A

T

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21
Q

In ADSL, Time division multiplexing divides the downstream path into one or more high speed channels and one or more low speed channels (T/F)

A

T

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22
Q

ADSL uses two types of Modulation
1) QAM
2) CAP
3) DMT
4) DTMF

A

CAP (Carrier less Amplitude Phase Modulation)
DMT (Discrete Multi Tone)
(DMT is the most widely used one)

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23
Q

ADSL Modulation CAP stands for

A

Carrier less Amplitude Phase Modulation -
a variant of quadrature amplitude modulation (QAM)

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24
Q

ADSL Modulation DMT stands for

A

Discrete Multi Tone

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25
Q

IMS stands for
1) IP Multimedia System
2) IP Multimedia Subsystem
3) IP Multimedia Solution
4) IP Mobile Subsystem

A

IP Multimedia Subsystem

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26
Q

IMS provides
1) real-time multimedia sessions
2) non-real-time multimedia sessions
3) both

A

both

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27
Q

_______ is also called Multimedia NGN (Next Generation Network).
1) MAX NGN
2) IMS

A

IMS (IP Multimedia Subsystem)

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28
Q

IMS deployment can be done by any entity that would decide to start an activity in IP services even without owning an access or transport network (T/F)

A

T

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29
Q

The core of ______is combining the best of two worlds datacom industry & telecom industry.
1) DSLAM
2) IMS
3) WiFi

A

IMS

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30
Q

IMS was s initially standardized by the
1) ITU
2) 3GPP
3) IEEEE

A

3GPP as part of its Release 5
targeted at supporting non-real
time services
3GPP Release 6 is targeted at supporting real time services

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31
Q

IMS supporting non-real-time services is
1) 3GPP Release 5
2) 3GPP Release 6
3) 3GPP Release 7

A

3GPP Release 5
targeted at supporting non-real
time services
3GPP Release 6 is targeted at supporting real time services

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32
Q

IMS supporting real-time services is
1) 3GPP Release 5
2) 3GPP Release 6
3) 3GPP Release 7

A

3GPP Release 6

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33
Q

WiMax stands for
1) Worldwide Interoperability for Microwave Access
2) Wireless Metropolitan Area Networks

A

Worldwide Interoperability for Microwave Access
- based on Wireless Metropolitan Area Network (MAN)

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34
Q

In IMS, CSCF stands for

A

Call State Control Function

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35
Q

In IMS, the three CSCF are
1) Serving CSCF (S-CSCF)
2) _______
3) ________

A

Proxy CSCF (P-CSCF)
Interrogating CSCF (I-CSCF)

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36
Q

In IMS, the three CSCF are
1) __________
2) _______
3) Interrogating CSCF (I-CSCF)

A

Serving CSCF (S-CSCF)
Proxy CSCF (P-CSCF)

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37
Q

In IMS, HSS stands for

A

Home Subscriber Server

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38
Q

In IMS, _______ provides session control services for a user
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function
S-CSCF Relay SIP requests and responses between calling and called parties

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39
Q

In IMS, _______ may act as a SIP Proxy Server that relays SIP messages
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function
(CSCF acts as a SIP server)

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40
Q

In IMS, _______ acts as the interface to
application servers and other IP or legacy service platforms
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function

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41
Q

In IMS, _______ provides service-related event notifications to users and generates Call Detail Records (CDRs) needed for accounting and billing
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function
(P-CSCF also creates CDRs; REF:p109 )

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42
Q

_______is a mobile’s first contact point inside a local (or visited) IMS.
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function

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43
Q

In IMS, _______accepts SIP requests from the mobiles and then either serves these requests internally or forwards them to other servers
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function
(CSCF acts as a SIP server)

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44
Q

In IMS, _______includes a Policy Control Function (PCF) that controls the policy regarding how bearers in the packet-switched network should be used
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function

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45
Q

In IMS, _______ forwards SIP REGISTER request from a mobile to the mobile’s home network.
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function
(CSCF acts as a SIP server)

46
Q

In IMS, _______ forwards SIP messages from the network to a mobile
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function
(CSCF acts as a SIP server)

47
Q

In IMS, _______ does compression and decompression of SIP messages. Compression is required to minimize the air-interface time.
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function
(CSCF acts as a SIP server)

48
Q

In IMS, _______ maintain a security association with the mobile.
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function

49
Q

In IMS, _______ detect emergency session.
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

P-CSCF: Proxy Call State Control Function

50
Q

________ is an optional function that can be used to hide an operator networks internal structure from an external network
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

I-CSCF: Interrogating Call State Control Function

51
Q

In IMS, _______ main function is to select an S-CSCF for a user’s session
1) P-CSCF
2) I-CSCF

A

I-CSCF: Interrogating Call State Control Function

52
Q

In IMS, _______ database is just like HLR & Authentication Centre (AuC).
1) HSS
2) SLF
3) ATS
4) no HLR concept

A

HSS: Home Subscriber Server

53
Q

In IMS, SLF stands for

A

Subscriber Location Function

54
Q

In IMS, _______ database is just like VLR
1) HSS
2) SLF
3) ATS
4) no VLR concept

A

No VLR concept in IMS

55
Q

In IMS, _______ is mandatory. Whereas ______is optional.
1) HSS, SLF
2) SLF, HSS

A

HSS is mandatory. Whereas SLF is optional
(Whenever n/w size is so big that if one HSS cannot store data then SLF is required, this is an addl. Component)

56
Q

Both HSS & SLF communicate through _________ protocol.

A

Diameter protocol.
This diameter is called AAA protocol.

57
Q

In IMS, MGCF stands for

A

Media Gateway Control Function (MGCF)

58
Q

In IMS, MRFP stands for

A

Multimedia Resource Function Processor (MRFP)

59
Q

In IMS, MRFC stands for

A

The Multimedia Resource Function Controller (MRFC)

60
Q

In IMS, BGCF stands for

A

Breakout Gateway Control Function (BGCF)

61
Q

In IMS, _________ support DTMF within the bearer path
1) MRFP, MRFC
2) BGCF, MGCF

A

MRFP, MRFC
Multimedia Resource Function Processor (MRFP)
The Multimedia Resource Function Controller (MRFC)

62
Q

In IMS, _________ selects to which PSTN network a session should be forwarded
1) MRFP
2) MRFC
3) BGCF
4) MGCF

A

Breakout Gateway Control Function (BGCF)
- for voice call BGCF selects MGCF for connection to PSTN

63
Q

In IMS, _________is responsible for interfacing with internal and external service platforms
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function

64
Q

In IMS, _______ responsible for Providing Open Access to 3rd Party Service (value-added services)
1) SIP
2) OSA SCS
3) IM-SSF

A

1) Open Service Access (OSA) Service Capability Server (SCS)
[all the three contribute to VAS]
The OSA application server interfaces with the CSCF through the OSA SCS by OSA API (Application
Programming Interface

65
Q

S-CSCF uses the same interface, IMS Service Control (ISC) interface, to interface with all service platforms. The signaling protocol over the ISC interface is ______.
1) SIP
2) OSA SCS
3) IM-SSF

A

SIP: Session Initiation Protocol

66
Q

In IMS, OSA SCS and IM-SSF are
1) application servers
2) gateways to other service environments
3) both

A

2) gateways to other service environments
OSA SCS and IM-SSF by themselves are not application servers.

67
Q

In IMS, _______ responsible for Interface with Legacy Service Platform
1) SIP
2) OSA SCS
3) IM-SSF

A

IM-SSF
IP Multimedia Service Switching Function

68
Q

In IMS, SIP-AS (SIP application server) is used for
1) session control
2) providing various value-added services
3) both

A

both

69
Q

In WiFi, CAPWAP stands for

A

Control and Provisioning of Wireless Access Points protocol

70
Q

all traffic generated from users is sent from AP to WLC through ____
1) DTLS
2) CAPWAP

A

CAPWAP tunnel
(Control and Provisioning of Wireless Access Points protocol)

71
Q

In WiFi, LWAPP stands for

A

Lightweight Access Point Protocol

72
Q

CAPWAP supports
1) layer 2
2) layer 3
3) both
4) none

A

layer 3 only
CAPWAP:Control and Provisioning of Wireless Access Points protocol

73
Q

LWAPP supports
1) layer 2
2) layer 3
3) both
4) none

A

both layer 2 and 3
LWAPP:Lightweight Access Point Protocol

74
Q

messages between WLC and AP
1) Data messages
2) control messages
3) both

A

both
Data messages (UDP port:5247)
control messages (UDP port:5246)

75
Q

_____ helps to move higher level protocol processing away prom AP
1) WLAN
2) VLAN
3) WLC

A

WLC: Wireless LAN controller

76
Q

First step to connect AP to WLC is
1) AP sends a CAPWAP join request
2) AP sends a Discovery request message
3) WLC sends a CAPWAP join request
4) WLC sends a Discovery request message

A

AP sends a Discovery request message
(after discovery process only, join process starts)

77
Q

After discovery process a DTLS connection is established between AP and WLC. DTLS stands for

A

Datagram Transport Layer Security

78
Q

Image data in communication between AP and WLC refers to
1) AP firmware
2) AP configuration
3) user image data

A

AP firmware
(if WLC has updates, AP can download it)
WLC: Wireless LAN controller

79
Q

Public Wi-Fi Providers/ Partners (PWPs) can deply WiFi with models including
1) RAPs (Remote Access Ponits)
2) Mesh APs
2) both

A

both

80
Q

With Public Wi-Fi Providers/ Partners (PWPs)
1) BSNL can broadcast its own SSID
2) internet shall be unlimited
3) SSID will be configured as per the Clients/Partner’s choice
4) required bandwidth for provisioning of bulk user plans shall be bundled with the various plans. BSNL will raise separate invoice to the bulk customers for bandwidth usage beyond plan limit

A

All of these
BSNL Reserves the right to broadcast its own SSID

81
Q

WAG can be used in deployments
1) Public & Community (Hotspot) WiFi
2) Mobile Network Offload
3) Smart cities
4) all the above

A

all the above
WAG: WiFi Access Gateway
can be implemented as hardware or software

82
Q

WAG stands for
1) Wireless Access Gateway
2) WiFi Access Gateway

A

WiFi Access Gateway

83
Q

LiFi (Light Fidelity) works based on VLC principle. VLC stands for

A

Visible Light Communication
It uses light with wavelength ranging from 380 nm to 780 nm

84
Q

The PHY and MAC layers of ____ system are defined in IEEE 802.15.7-2011 standard
1) WiFi
2) LiFi

A

LiFi

85
Q

Li-Fi can achieve extremely ____ data transfer rates compared to traditional WiFi
1) high
2) low

A

high

86
Q

LiFi
1) does not cause any EM (Electro-Magnetic) interference
2) data transfer About 1 Gbps
3) operates at 2.4GHz, 4.9GHz and 5GHz

A

1 and 2
3 is for WiFi

87
Q

LiFi network topology
1) star
2) peer-to-peer
3) broadcast

A

all of them

88
Q

LiFi Modulation Type(s)
1) OOK
2) VPPM
3) CSK

A

all of them
OOK:On Off Keying
VPPM: Variable Pulse Position Modulation
CSK: Color Shift Keying

89
Q

LiFi Modulation Type OOK stands for

A

On Off Keying

90
Q

LiFi Modulation Type VPPM stands for

A

Variable Pulse Position Modulation

91
Q

LiFi Modulation Type CSK stands for

A

Color Shift Keying

92
Q

In IMS, ATS stands for

A

Advanced Telephony Server
for providing VAS(value added services)

93
Q

In IMS, _______ can act as a SIP Registrar to accept users’ SIP registration requests and make users’ registration and location information available to location servers such as the HSS

A

S-CSCF: Serving Call State Control Function

94
Q

In IMS, ______ Relay SIP requests and responses between calling and called parties
1) S-CSCF
2) P-CSCF
3) I-CSCF

A

S-CSCF: Serving Call State Control Function

95
Q

In IMS, Suppose S-CSCF has done some authorisation then it has to contact ____ for downloading authentication etc.
1) HSS
2) SLF
3) none

A

HSS if only one HSS
But if more than one HSS then SLF will check which HSS

96
Q

In IMS, SLF will have
1) user ID
2) HSS ID
3) both

A

both

97
Q

In IMS, Multimedia Resource Function Processor (MRFP)
1) Sources media streams (for multimedia announcements)
2) Processes media streams (e.g. audio transcoding, media analysis)
3) Tones and announcements –Applied on receipt of ACK, self-timed with BYE or stopped on BYE
4) Support DTMF within the bearer path

A

all of them

98
Q

Total IMS cores available
1) 4
2) 8
3) 10
4) 12

A

10
( 8 cores planned by Huawei. then 2 more added by UTstarcom at Chandigarh and Hyderabad)
Kolkata & Bhubaneshwar - East
Pune & Ahmedabad - West
Lucknow & Chandigarh - North
Bangalore & Hyderabad - South

99
Q

The two IMS Core Networks provided
by UTStarcom are located in
1) Pune & Ahmedabad
2) Bangalore & Chandigarh
3) Hyderabad & Chandigarh
4) Kolkata & Bhubaneswar

A

Hyderabad & Chandigarh

100
Q

In IMS, __________ is responsible for providing VAS (value added services)
1) HSS
2) SLF
3) ATS
4) no VAS concept

A

Advanced Telephony Server (ATS)
[SIP, OSA SCS, IM-SSF can also provide VAS]

101
Q

In IMS, __________ interface to CAMEL Service Environment (CSE)
1) SIP
2) OSA SCS
3) IM-SSF

A

IM-SSF

102
Q

any two user from any two different IP based network can be involved in a session under the umbrella of ____ management
1) IMS
2) VAS

A

IMS management

103
Q

In IMS, __________ is responsible for inter-working with peer IMS network
1) BGCF
2) MGCF
3) IBCF
4) CSCF

A

IBCF: Interconnection Border Control Function

104
Q

In IMS, __________ is responsible for IVRS
1) MRF
2) CSCF
3) IBCF
4) CSCF

A

MRF
(MRFC+MRFP)

105
Q

In IMS, __________ selects appropriate MGCF
1) BGCF
2) MRB
3) IBCF
4) CSCF

A

BGCF: Breakout Gateway Control Function

106
Q

In IMS, __________ controls transmission gateway (TrGW)
1) BGCF
2) MRB
3) IBCF
4) CSCF

A

IBCF: Interconnection Border Control Function

107
Q

Default Bearer With APN “IMS” and ________ for IMS signalling for VoLTE
1) QCI=1
2) QCI=3
3) QCI=5
4) QCI=9

A

QCI=5
(QCI=9 for internet access)

108
Q

users data related to value added services are stored as XML files in ___
1) AS
2) HSS
3) MGW

A

AS: Application Server
(Mobile interface to AS is XCAP)

109
Q

Mobile interface to AS is Ut running XCAP protocol (not directly, but via CSCF).
XCAP stands for

A

XML Configuration Access Protocol
(users data related to value added services are stored in ‘AS’ as XML files)

110
Q

Decides how to route the Telephony sessions having source or destination in CS
network
1) BGCF
2) MRB
3) IBCF
4) CSCF

A

BGCF: Breakout Gateway Control Function

111
Q

S-CSCF uses the same interface____ to interface with all service platforms.
1) MAP
2) CAP
3) ISC

A

IMS Service Control (ISC) interface

LDCE Wireline (5 decks)

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