1. Consider the figure below. The IP and MAC addresses are shown for nodes A, B, C and D, as well as for the router's interfaces.
a. What is the source mac address at point 6 ?
b. What is the destination mac address at point 6 ?
c. What is the source IP address at point 6 ?
d. What is the destination IP address at point 6 ?
e. Do the source and destination mac addresses change at point 5? Answer with yes or no.
2. Consider the figure below, which shows the arrival of 7 messages (numbered message 1,2,3..7) for transmission at different multiple access wireless nodes at times t={0.9,1.2,2.4,3.7,3.9,4.2,4.8} and
each transmission requires exactly one time unit. ( 0.5 points per question)
a. Suppose all nodes are implementing the Aloha protocol. For each message, indicate the time at which each transmission begins.
b. Which messages transmit successfully? Write your answer as a comma separated list with no spaces using the messages' numbers.
c. Suppose all nodes are implementing the Slotted Aloha protocol. For each message, indicate the time at which each transmission begins.
d. Which messages transmit successfully?
e. Which protocol has better efficiency? (Aloha/Slotted Aloha
3. Consider the 6-node network shown below, with the given link costs:
a. When the algorithm converges, what are the distance vectors from router 'W' to all routers? Write your answer as u,v,w,x,y. [1 pt]
b. What are the initial distance vectors for router 'X'? Write your answer as u,v,w,x,y and if a distance is infty , write 'x'. [1 pt]
c. The phrase 'Good news travels fast' is very applicable to distance vector routing when link costs decrease; what is the name of the problem that can occur when link costs increase? [0.5 pt]
d. Which messages transmit successfully? Which protocol has better efficiency? (Aloha/Slotted Aloha)
1. Consider the figure below. The IP and MAC addresses are shown for nodes A, B, C and D, as well as for the router's interfaces. (0.5 points per question)
3. Consider the 6-node network shown below, with the given link costs:
1,9,3,
B
17130
(6)
(3)
(1)
(2)
(5)
18
121-9,0, -5-68
a. What is the source mac address at point 6?
b. What is the destination mac address at point 6?
c. What is the source IP address at point 6?
a. When the algorithm converges, what are the distance vectors from router 'W' to all routers? Write your answer as y,y.wx.y, [1 pt]
d. What is the destination IP address at point 6?
e. Do the source and destination mac addresses change at point 5? Answer with yes or no.
b. What are the initial distance vectors for router X? Write your answer as u,v.w.x.y and if a distance is oo, write 'x'. [1 pt]
c. The phrase 'Good news travels fast' is very applicable to distance vector routing when link costs decrease; what is the name of the problem that can occur when link costs increase? [0.5 pt]
2.Consider the figure below, which shows the arrival of 7 messages (numbered message 1,2,3...7) for transmission at different multiple access wireless nodes at times t = {0.9, 1.2, 2.4, 3.7, 3.9, 4.2, 4.8} and each transmission requires exactly one time unit. (0.5 points per question)
r=0.0
t=1.0
t=2.0
t=3.0
4.0
t5.0
a. Suppose all nodes are implementing the Aloha protocol. For each message, indicate the time at which each transmission begins. b. Which messages transmit successfully? Write your answer as a comma separated list with no spaces using the messages' numbers. Suppose all nodes are implementing the Slotted Aloha protocol. For each message, indicate the time at which each transmission begins.
