Computer Science Paper 1 Exam
Questions with Accurate Answers
Describe how memory management prevents the system from crashing when
more than one program is run at the same time. - ANSWERSmemory management
allocates (and deallocates) specific sections of memory to each
program/process/module. This ensures that the memory assigned to one
program is not overwritten. Additionally it uses secondary/virtual memory to
allow more processes to run simultaneously;
Outline the main steps involved in a selection sort - ANSWERSThe list is
searched for the next element in order, and it is placed in its correct position in
the new list deleting original OR in the same list by swapping with the element
that was there; This is repeated for all elements.
Discuss the importance of protocols in ensuring the successful preparation,
transmission and delivery of data using packet switching. - ANSWERS- Packet
switching involves splitting data into packets to transmit to a specific destination;
- Protocols are rules/standards used to compile and transmit each packet in a
standard format;
- It is essential that all packets are constructed exactly the same so that the
receiver does not need
further instructions for decoding the packets;
- Error checking methods included to verify that data arrives in same state as it
was sent;
- Protocols include destination information that means that at each node the
packet passes through it is sent to the next node towards the correct destination;
- Packet number essential to be included for reassembling at the other end as not
all
packets will arrive in order;
Outline one problem that may arise from the installation of new hardware and
software in the office. - ANSWERS- Data migration problems; For example,
different file formats so conversion must be performed
- Employee efficiency may drop; As they learn to use the new system;
Identify one hardware component of the WLAN, other than computers. -
ANSWERS- Wireless router/modem;
- Access points;
- Switch;
, - Wireless repeater/extender/booster;
Outline two disadvantages of this WLAN, and two advantages -
ANSWERSDisadvantages
- Less data security; devices from outside the school can access the
network/intercept transmissions;
- More easily open to misuse; teacher/administrator cannot directly monitor a
specific student/teacher/
machine;
Advantages
- No extra equipment is needed for expansion after initial set-up, which will save
the company time and money
- Reduces wiring; therefore improved safety for employees;
Identify three ways in which the network administrator can reduce the risk of
unauthorized access to confidential data. - ANSWERS- Give each user
appropriate login details/passwords;
- Different access rights for students, teachers, school administrators (file-level
and share-level security);
- All passwords and files should be encrypted;
- Require MAC address authentication;
explain how data is transferred by packet switching. - ANSWERS- Data is
organized in specially formatted units (data packets) which are routed from
source to destination using network switches and routers
- Network switches and routers determine how best to transfer the packet
between a number of intermediate devices (routers and switches) on the path to
its
destination (rather than flowing directly over a single wire on the path to its
destination)
- Data packets are reassembled at the destination;
- Addresses have to be in a standard format so that each switch/routing station
recognizes the address
- The protocol used must be identified so that the correct rules are followed
- Size of packet / size of fields in packet - All packets/fields must have the same
size so that the data can be reassembled;
Outline the role of the memory data register in the machine execution cycle. -
ANSWERSHolds (a copy of) the contents of the memory which are to be
transferred from/to memory to/from other CPU components, allowing the
processor and memory to act independently/processor not affected by
differences in the speed of operation;
Questions with Accurate Answers
Describe how memory management prevents the system from crashing when
more than one program is run at the same time. - ANSWERSmemory management
allocates (and deallocates) specific sections of memory to each
program/process/module. This ensures that the memory assigned to one
program is not overwritten. Additionally it uses secondary/virtual memory to
allow more processes to run simultaneously;
Outline the main steps involved in a selection sort - ANSWERSThe list is
searched for the next element in order, and it is placed in its correct position in
the new list deleting original OR in the same list by swapping with the element
that was there; This is repeated for all elements.
Discuss the importance of protocols in ensuring the successful preparation,
transmission and delivery of data using packet switching. - ANSWERS- Packet
switching involves splitting data into packets to transmit to a specific destination;
- Protocols are rules/standards used to compile and transmit each packet in a
standard format;
- It is essential that all packets are constructed exactly the same so that the
receiver does not need
further instructions for decoding the packets;
- Error checking methods included to verify that data arrives in same state as it
was sent;
- Protocols include destination information that means that at each node the
packet passes through it is sent to the next node towards the correct destination;
- Packet number essential to be included for reassembling at the other end as not
all
packets will arrive in order;
Outline one problem that may arise from the installation of new hardware and
software in the office. - ANSWERS- Data migration problems; For example,
different file formats so conversion must be performed
- Employee efficiency may drop; As they learn to use the new system;
Identify one hardware component of the WLAN, other than computers. -
ANSWERS- Wireless router/modem;
- Access points;
- Switch;
, - Wireless repeater/extender/booster;
Outline two disadvantages of this WLAN, and two advantages -
ANSWERSDisadvantages
- Less data security; devices from outside the school can access the
network/intercept transmissions;
- More easily open to misuse; teacher/administrator cannot directly monitor a
specific student/teacher/
machine;
Advantages
- No extra equipment is needed for expansion after initial set-up, which will save
the company time and money
- Reduces wiring; therefore improved safety for employees;
Identify three ways in which the network administrator can reduce the risk of
unauthorized access to confidential data. - ANSWERS- Give each user
appropriate login details/passwords;
- Different access rights for students, teachers, school administrators (file-level
and share-level security);
- All passwords and files should be encrypted;
- Require MAC address authentication;
explain how data is transferred by packet switching. - ANSWERS- Data is
organized in specially formatted units (data packets) which are routed from
source to destination using network switches and routers
- Network switches and routers determine how best to transfer the packet
between a number of intermediate devices (routers and switches) on the path to
its
destination (rather than flowing directly over a single wire on the path to its
destination)
- Data packets are reassembled at the destination;
- Addresses have to be in a standard format so that each switch/routing station
recognizes the address
- The protocol used must be identified so that the correct rules are followed
- Size of packet / size of fields in packet - All packets/fields must have the same
size so that the data can be reassembled;
Outline the role of the memory data register in the machine execution cycle. -
ANSWERSHolds (a copy of) the contents of the memory which are to be
transferred from/to memory to/from other CPU components, allowing the
processor and memory to act independently/processor not affected by
differences in the speed of operation;
