Individual Comments: Your answers missed there below topics, spend a little more time on the format of your answers question 1 - backward compatibility?, scalability? question 2 - success rate?, reliability? question 3 - QoS?, Security? question 4 - foreign agent? 1. Why did Ethernet become an acceptable LAN standard? Be specific in your explanation. Many factors funded to Ethernet by becoming a LAN standard, the first factor is that Ethernet is reliable by using CSMA/CD to sense before sending any data to the network to avoid crash, and in this case the crash detection method stop all transmission and assigns a random retransmission delay time to all nodes. The second factor is the management tools that are available to manage the Ethernet using SNMP from a central location. The third factor is Ethernet trouble shooting is easy by using easy ways for example the light indicator or a more sophisticated way like using a network analyzer. The fourth reason is that Ethernet has a low cost comparing it to other technologies that the user doesn't need to buy extra hardware and can connect it directly depending on his computer network. On the other hand, it doesn’t have a security issue such as wireless networks which has risk through the airwaves, but, users should have good security desktop application to prevent unapproved accesses. 2.From the users point of view how does one measure network performance? The network performance is identified commonly in bites per seconds. It can be measured by multiple factors which are bandwidth, throughput, latency and error rate and from those factors the bandwidth is the maximum rate that data can be transferred with, Latency is the delay between the sending and receiving. Error rate is the percentage of corrupted data that is being sent. There are three main possible ways to measure: the first one is the total of bytes transferred (from server to the user and opposite) in one session which can be used to measure the overhead of protocol (bandwidth). Second ways, number of round trips in one operation (transaction). Third point, time taken to pull or push from network bandwidth and ping time. Moreover, the user could measure network performance in normal way by trying to copy a file over the network depending on the file transferring time; furthermore, he could gauge the speed by the time it takes for a file to copy from or to the network. 3.Why did IPv4 prevail for such a long time and why the change to IPv6? Shifting for IPv4 to IPv6 requires a huge investment of human and capital resources. While, it doesn’t provide a clear picture of the short-term return which resulted the enterprises to frequently postpone this investment. However the time came to change from IPv4 to IPv6. IPv4 provide maximum of about 4 billion addresses whereas IPv6 has an unthinkable theoretical maximum: about 340 trillion, trillion, trillion addresses. Previously (with IPv4) home user got a single user, while the IPv4 pro.

1. Individual Comments:
Your answers missed there below topics, spend a little more
time on the format of your answers
question 1 - backward compatibility?, scalability?
question 2 - success rate?, reliability?
question 3 - QoS?, Security?
question 4 - foreign agent?
1. Why did Ethernet become an acceptable LAN standard?
Be specific in your explanation.
Many factors funded to Ethernet by becoming a LAN standard,
the first factor is that Ethernet is reliable by using CSMA/CD to
sense before sending any data to the network to avoid crash, and
in this case the crash detection method stop all transmission and
assigns a random retransmission delay time to all nodes. The
second factor is the management tools that are available to
manage the Ethernet using SNMP from a central location. The
third factor is Ethernet trouble shooting is easy by using easy
ways for example the light indicator or a more sophisticated
way like using a network analyzer. The fourth reason is that
Ethernet has a low cost comparing it to other technologies that
the user doesn't need to buy extra hardware and can connect it
directly depending on his computer network. On the other hand,
it doesn’t have a security issue such as wireless networks which
has risk through the airwaves, but, users should have good
security desktop application to prevent unapproved accesses.
2.From the users point of view how does one measure network
performance?

2. The network performance is identified commonly in bites per
seconds. It can be measured by multiple factors which are
bandwidth, throughput, latency and error rate and from those
factors the bandwidth is the maximum rate that data can be
transferred with, Latency is the delay between the sending and
receiving. Error rate is the percentage of corrupted data that is
being sent. There are three main possible ways to measure: the
first one is the total of bytes transferred (from server to the user
and opposite) in one session which can be used to measure the
overhead of protocol (bandwidth). Second ways, number of
round trips in one operation (transaction). Third point, time
taken to pull or push from network bandwidth and ping time.
Moreover, the user could measure network performance in
normal way by trying to copy a file over the network depending
on the file transferring time; furthermore, he could gauge the
speed by the time it takes for a file to copy from or to the
network.
3.Why did IPv4 prevail for such a long time and why the change
to IPv6?
Shifting for IPv4 to IPv6 requires a huge investment of human
and capital resources. While, it doesn’t provide a clear picture
of the short-term return which resulted the enterprises to
frequently postpone this investment. However the time came to
change from IPv4 to IPv6. IPv4 provide maximum of about 4
billion addresses whereas IPv6 has an unthinkable theoretical
maximum: about 340 trillion, trillion, trillion addresses.
Previously (with IPv4) home user got a single user, while the
IPv4 provides blocks of addresses sufficient to number multiple
networks and thousands of devices. Moreover, Enterprises and
small businesses will generally be given enough to number a
substantial number of networks and tens of thousands of
devices; while larger sites will get significantly even more.

3. 4.How does IP solve the user wireless mobility requirements
when entering to a different network cell?
The mobile IP allowed users to move from one network to
another while maintaining the same IP address. Each node is
identified by its home address without looking at its location.
Moreover, node must recognized and located on the network
directed by its IP address in order to receive datagrams, so,
when moving to different networks the IP protocol does not
allow the current IP address to be valid in the visiting network.
In this case a scheme must be provided to allow nodes to
maintain and reach the connections while moving.