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Mobile Networks 3 - (AL_KCENI_8_3) 15974

Mobile Networks 3 - (AL_KCENI_8_3) 15974

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If the call is to a number within your PLMN how is the call routed?

through the BSC

the MSC turns to the relevant HLR via the dialed MSISDN to send the call to its destination.

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If a call is made to another PLMN or the PSTN how is the call routed

it is routed there via the Gateway MSC (GMSC)

it is routed there via the MSC (MSC)

it is routed there via the air interface

it is routed there via the BSC

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Identify the times when a location area update may occur?

When a mobile customer changes his/her Location Area

At regular intervals after a mobile customer has not moved his/her mobile station for some time.

On leaving a cell

At midnight every night

When a mobile customer switches on his/her mobile station

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What are the disadvantages to frequent location updates? (Choose 2)

takes up a lot of radio resources.

result in a drain on the mobiles battery

Slow down the phones response time

wastes a lot of time

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When is a TMSI allocated?

when phone is bought

when phone is turned on

after the first Location Update of the mobile station

its hardwired into phone

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When you initiate a call on your mobile phone the network will analyse your profile. Why? (choose 3)

And To route the call

see if you can afford service

see how much credit you have

To activate the requested service

To authorise or refuse the use of the network

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What algorithms are used in the authentication process?

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Outline what a mobile phone does after the user powers up and enters his pin number? (select 3)

Informs the network of its current location

Selects an available frequency

Looks for paging messages

Synchronises in time with the network

Adjusts to the max power setting

Selects a cell of the subscriber's own network operator, or failing that then the network of a contract partner

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What is meant by location updates?

It where the phone gives the user updates on services in the area

The process where the phone keeps the network up to date on its current location

Location based services are kept up to date on phones in the area

Where the phone sends GPS coordinates to the Network

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Authentication is

making sure the phone is not stolen

making sure no errors occur during transmission

scrambling the data so no one can evesdrop

confirming the person is who they say they are

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