Computer Networking: - TCP operation on a channel with loss - Network Blocks Que

Question

Computer Networking:

- TCP operation on a channel with loss

- Network Blocks

Question 4- TCP Operation on a channel with Loss (20pt) send base nextseqnum already ack'ed usable, not yet sent 02002 sent, not yet ack'ed not usable 4 window size_ ?00 Let's consider a TCP sender at a Slow start with "send base" at 1000 with congestion window N-8. Assume MSS is 1000 Consider four TCP packets have been sent with sequence numbers 1000, 2000, 3000 and 4000 with 1000 bytes of data respectively. Then, a packet is received with TCP ACK number3000 with rwnd (receiver window) size of 5,000. Answer the following questions with an assumption that another ACK is not received yet a. (4pt) What is the new value of SendBase? b. (4pt) What is the last byte (number) that could be sent considering available rwnd size?b c. (4pt) What is the new congestion window value, N-? d. (4pt) What is the last byte (number) that could be sent if rwnd is infinite? C. d. Now, let's assume the sender sent five more TCP packet when it had received the TCP ACK number 3000 from the receiver before, and receives the sam e. (4pt) What is the next TCP packet's Sequence Number that this sender needs to transmit? e f. (4pt) What would have been the following TCP packet's Sequence Number of the sender, if all the previous packets had been received at the receiver successfully? CP packets with ACK number 3000 with the same rwnd 5000

Explanation / Answer

Q7.) a.) Lowest address = network address = ANDing (130.207.160.0 and 255.255.248.0) which is 130.207.160.0/21

b.) Network Mask: 255.255.248.0

c.) Broadcast address: 255.255.255.255

d.)Highest Address: 130.207.167.255/21

e.) Maximum no. of hosts will be 2^9 - 2 = 512 - 2 = 510

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