check my answers for Networking
I came up with these answers, can check my answers
Question 1: General
What data rate is needed to transmit an uncompressed 4" x 6"
photograph every second with a resolution of 1200 dots per inch and
24 bits per dot (pixel)?
691,200 kb/s
28.8 kb/s
8.29 Mb/s
829 Mb/s
Question 2: Layering
"Layering" is commonly used in computer networks because (check all
that apply):
-It forces all network software to be written in ‘C’.
-Encapsulation is the lowest overhead method to transmit
data.
-It provides a separation of concerns; each layer has
well defined responsibilities.
-It allows widespread re-use of code and
functionality.
-It keeps networks warm enabling them to run faster
Question 3: The Internet Protocol
IP provides (check all that apply):
-a connection-oriented service
-unreliable delivery
-best-effort delivery
-in-sequence delivery
Question 4: The Transmission Control Protocol
TCP provides (check all that apply):
-a connection-oriented service
-unreliable delivery
-best-effort delivery
-in-sequence delivery
Question 5: TCP and Flow Control
You set up an experiment in which host A blasts a 26 Megabyte file
to host B through a single TCP Tahoe connection over a 1
Gigabit/sec Ethernet. B transmits no data. Neither host uses any IP
or TCP options. The maximum Ethernet payload size is 1500 bytes.
With no options, the IP+TCP headers occupy exactly 40 bytes. This
leaves a TCP maximum segment size (MSS) of 1,460 bytes,
approximately 1/18,000 the size of the file. Which of the following
statements are true (check all that apply):
-Host B can send TCP acknowledgements to host A, even though it
has no data to send.
-The size of the flow control window in segments B sends (the
window field) cannot increase throughout the duration of the
connection.
-Suppose that the last RTT sample at host A is 10 msec. The current
value of the RTT estimate must be greater than or equal to 10
msec.
-If the user temporarily stops or suspends the process
receiving the data on host B, host A will eventually stop sending
new data until B's receiver process is resumed.
Question 6: TCP and Congestion Control
a) So far, we have mostly discussed TCP's congestion control and
AIMD in the context of single-packet losses. This question examines
how very long-lived TCP flows sending large amounts of data respond
to 2-packet bursts of losses. For sake of simplicity, you should
assume only data packets are lost (no acknowledgements are lost),
the RTT is constant, the packet loss rate is independent of the
transmission rate, and the drop rate is low enough that the
congestion window can grow to be at least 8 segments before a loss.
Furthermore, packet losses are periodic rather than probabilistic.
For example, with a 2% packet loss rate, single packet losses will
cause 49 packets to be successfully delivered, followed by one
loss, while 2-packet bursts will lead to 98 successful delivered
packets followed by 2 losses. Under these constraints, which of the
following is true?
-TCP Tahoe will have lower throughput with 2-packet bursts of
losses than evenly-spaced single losses.
-TCP Tahoe will have higher throughput with 2-packet
bursts of losses than evenly-spaced single
losses.
b) Assume that 1 in 256 of packets are lost (1 every 256 for
single losses, 2 in 512 for double losses). Which of the following
most closely describes the difference in throughput?
-They will be greatly different (the higher throughput one will be
over twice as fast)
-They will be significantly different (the higher
throughput one will be over 10% faster but less than
100%)
-They will be slightly different (the higher one will be over 1%
faster but less than 10%)
Question 7: Queues
While visiting Disneyland you watch the single queue of people
waiting to go on one of the rides. You estimate an average of 12
new people arriving per minute, and an average of 240 people
waiting in the queue. What is a reasonable estimate of the average
time people wait in line before they board the ride?
-20 seconds
-240 seconds
-20 minutes
-0.5 minutes
For the next three questions:
It has been predicted that the capacity of the public Internet will
continue to grow significantly because of a continued growth in the
amount of video traffic delivered to people’s homes. In the
following questions, we’ll make some crude assumptions to try and
estimate how much total network capacity might be needed in the
future.
Question 8
Assuming there are 100 million households in the US, and that each
household has two HDTVs, and that each TV is used to watch 4 hours
of video per day. We’ll assume that each (compressed) video streams
at 2Mb/s. If all households are watching both TVs at the same time,
and all are watching video on-demand (i.e. data is delivered
unicast to every household), then which of the following is the
closest approximation of the total peak aggregate data rate
delivered to all homes?
-100 Tb/s (100 × 10^12b/s)
-400 Tb/s (400 x 10^12b/s)
-1 Pb/s (1 x 10^15b/s)
-100 Gb/s (100 x 10^9 b/s)
-2 Tb/s (2 x 10^12b/s)
Question 9
Now let’s compare our answer above with an estimate of the future
capacity needed to carry web traffic. We’ll assume 100 million
people download an average of 100 web pages per day (i.e. averaged
over 24 hours), each containing 1Mbyte of data. If the peak traffic
is five times the average, then which of the following is the
closest estimate of the capacity needed by the network to deliver
this traffic?
-500 Gb/s
-1 Tb/s
-5 Tb/s
-10 Tb/s
Question 10
We can think of the network as a spanning tree, with the video
server at the root, and the one hundred million subscribers at the
leaves. Assuming that the tree has degree eight (i.e. each router
in the tree connects to eight other routers closer to the leaves),
then roughly how many routers does a packet pass through from the
root to each subscriber?
-9
-10
-11
-12
-13
Question 11: Queues
At the start of every second, a train of 100 bits arrive to a queue
at rate 1000 bits/second. The departure rate from the queue is 500
bits/second. The queue is served bit-by-bit, and you can assume the
buffer size is infinite.
a) What is the average queue occupancy? (in bits)
Note: Enter an integer. Any other kind of answer will result in a 0
point grade for this question.
5
b) What is the average delay of a bit in the queue? (in
milliseconds)
Note: Enter an integer. Any other kind of answer will result in a 0
point grade for this question.
0.5
c) If the trains of 100 bits arrived at random intervals, one train
per second on average, would the average queue occupancy be the
same, lower or higher than in part (a)?
-Higher
-Same
-Lower
d) If the departing bits from the queue are fed into a second,
identical queue with the same departure rate, what is the average
occupancy of the second queue? (in bits)
Note: Enter an integer. Any other kind of answer will result in a 0
point grade for this question.
-0
Question 12: Protocol Stack
You plug a new laptop into a wired Ethernet jack for the first
time. You have already told the network administrators your MAC
address, and can join the network with no further action on your
part.
Assume that:
1. your DHCP server is 171.64.7.77,
2. your Ethernet address is 00:11:22:33:44:55
3. the IP address you'll be given is 171.64.7.22
4. the gateway IP address is 171.64.7.1
5. the gateway Ethernet address is 00:66:77:88:99:00
6. the netmask is 255.255.255.0
Let's consider the series of packet exchanges that will occur on
the link for your laptop to send a single IP packet to 128.30.2.1.
We assume that no packets are lost or discarded, and that no other
packets are exchanged on the link.
a) Which of the following protocols are involved in the series
of packet exchanges (check all that apply)?
-IP
-ARP
-UDP
-ICMP
-DHCP
b) How many packets will traverse the link ?
-4
c) In which packet (sent or received) will your IP address be
mentioned for the first time?
-the 1st packet
-the 2nd packet
-the 3rd packet
-the 4th packet
-the 5th packet
d) How many packets (sent or received) contain the Ethernet
address of the gateway?
2
e) How many packets (sent or received) contain the IP address of
the DHCP server?
10
Solution:
The first four subparts have been answered as HOMEWORKLIB guidelines, please repost others.
1)
4*6 = 24 inch^2
= 24*1200*1200= 34560000 dots
= 829440000 bits
divide by 10^6 to convert it into Mb/s
829.44 Mb/s
Your answer is correct.
2)
Your slsected statements are absolutely correct
-It provides a separation of concerns; each layer has well
defined responsibilities.
-It allows widespread re-use of code and functionality.
3)
the correct options here are
-unreliable delivery
-best-effort delivery
4)
-a connection-oriented service
-in-sequence delivery
these options are also correct.
I hope this helps if you find any problem. Please comment below. Don't forget to give a thumbs up if you liked it. :)
check my answers for Networking I came up with these answers, can check my answers Question...
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