are destined to C or not). From what senders do these frames arrive? C' B' A 2 3 A' B C

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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please take a look at the two pic. urgent

6.3A-3. Multiple Access protocols (3). Consider the figure below, which shows the arrival of 6
messages for transmission at different multiple access wireless nodes at times t=0.1, 1.4, 1.8, 3.2,
3.3, 4.1. Each transmission requires exactly one time unit.
t=0.0
L
1
[
[
5
3
1
st
For the CSMA protocol (without collision detection), indicate which packets are successfully
transmitted. You should assume that it takes .2 time units for a signal to propagate from one node to
each of the other nodes. You can assume that if a packet experiences a collision or senses the
channel busy, then that node will not attempt a retransmission of that packet until sometime after
t=5. Hint: consider propagation times carefully here. [Note: You can find more examples of problems similar to this here B.)
6
t=1.0
N
2 3
t=2.0
45
t=3.0
6
t=4.0
t=5.0
Transcribed Image Text:6.3A-3. Multiple Access protocols (3). Consider the figure below, which shows the arrival of 6 messages for transmission at different multiple access wireless nodes at times t=0.1, 1.4, 1.8, 3.2, 3.3, 4.1. Each transmission requires exactly one time unit. t=0.0 L 1 [ [ 5 3 1 st For the CSMA protocol (without collision detection), indicate which packets are successfully transmitted. You should assume that it takes .2 time units for a signal to propagate from one node to each of the other nodes. You can assume that if a packet experiences a collision or senses the channel busy, then that node will not attempt a retransmission of that packet until sometime after t=5. Hint: consider propagation times carefully here. [Note: You can find more examples of problems similar to this here B.) 6 t=1.0 N 2 3 t=2.0 45 t=3.0 6 t=4.0 t=5.0
6.4-5. Self Learning Switches (b). Consider the network below with six nodes,
star-connected into an Ethernet switch. Suppose that A sends a frame to A, A'
replies to A, then B sends a message to B' and B' replies to B. Suppose you are
node C, and consider the frames arriving to node C's interface (whether they
are destined to C or not). From what senders do these frames arrive?
C'
B'
>
()
>
B
U
ینا
A'
C
A
T
A
2
3
A'
B
C
Not quite. This answer is incorrect.
Transcribed Image Text:6.4-5. Self Learning Switches (b). Consider the network below with six nodes, star-connected into an Ethernet switch. Suppose that A sends a frame to A, A' replies to A, then B sends a message to B' and B' replies to B. Suppose you are node C, and consider the frames arriving to node C's interface (whether they are destined to C or not). From what senders do these frames arrive? C' B' > () > B U ینا A' C A T A 2 3 A' B C Not quite. This answer is incorrect.
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