1.
How many visitors who have visited my website?
376
2. With reference to Chapter 2,
answer the following questions
i. Briefly describe the function of
the equipment at layers 1, 2 and 3.
Layer 1:
·
Transmit and receive data to communication medium
·
Does not care about content
·
Media, voltage , levels
,speed ,connector
Layer 2:
·
Detect and corrects error
·
Organizes data into frames before passing it down. Sequence
packet(if necessary)
·
Accept acknowledgement from immediate receiver.
Layer 3:
·
Relay and route information to destination
·
Manage journey of datagram and figure out intermediate hops(if
needed)
ii. Specify 7 criteria to consider
when selecting a NOS.
·
Reliability – stably perform in any condition
·
Performance-serve the clients in a seamless way
·
Adaptability-adapt request of different platform.
·
Affordability-ability to pay cost
·
Scalability-continue function well when size expand
·
Ease-ease installation
·
Security-ability to eliminate and repel threats
iii. Explain the differences between
Logical address and Physical address.
|
Physical Address
|
Logical Address
|
|
Address seen by the memory unit and it allow the data bus to
access a particular memory cell in the memory
|
Generated by the CPU when executing a program are mapped in to
physical address using the MMU.
|
iv. Explain the differences between
OS and NOS.
|
OS
|
NOS
|
|
Peer to peer model :Several computer using different operating
systems in a small business or home can be connected to form a small LAN
|
User account: collection of all
of the information that pertains to a user on a computer
|
|
Client/server model :control which resource on the LAN are shared, and who can access these resource
|
Authentication ,validation ,log in:
The process of entering a correct user ID and password to gain access to a computer.
|
3.
In your opinion why IPv6 is still not fully implemented.
There is no specific
date when everything must be upgraded to IPv6 (although some organizations,
including governments, have already identified target dates for their own IPv6
implementation. IPv6 and its transition mechanisms have been designed for a
long period of co-existence with IPv4 and it is expected that IPv4-only systems
and applications will survive for many years. However, IPv6-only systems are
expected to arise and many of these users are likely to be in emerging business
markets and developing countries.
