The following shows the Info column of three frames captured by Wireshark: Frame Source Destination 1 Host A Host B 2 Host B Host A Host A Host B Info [SYN] Seq=0 Win=29200 Len=0 MSS=1460 [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 [ACK] Seq=1 Ack=1 Win=29200 Len=0 MSS=1460 a. Which transport layer protocol uses packets like these? b. What is the purpose of these packets? c. What name is given to the process performed by these packets? The following shows frames sent from Host A to Host B during the same capture as the previous question (Frames sent from Host B to Host A are not shown). Source Destination Host A Host B Host A Host B Host A Host B Host A Host B Info [ACK] Seq=532 Ack=2520 Win=34020 Len=0 [ACK] Seq=532 Ack=3780 Win=37800 Len=0 [ACK] Seq=532 Ack=5040 Win=40320 Len=0 [ACK] Seq=532 Ack=6300 Win=42840 Len=1500 Select from the following for parts a) and b): i. Host A received additional data from Host B ii. Retransmissions of a lost packet iii. Host A did not send any data to Host B iv. To maintain the connection between Host A and Host B a. The reason why the value of Seq does not change. b. The reason why the value of Ack does change. c. The value of Seq will change in the last packet. What will its new value be The diagram below illustrates a NAT-enabled router connecting a LAN to the Internet. The IP addresses of the router's LAN and Internet interfaces are shown. src = 192.168.30.10 : 2500 dst = 134.210.1.99 : 80 src = _ _(A)_ dst = (B)_ : _(C)] : _(D)_ Internet 192.168.30.1 140.62.1.8 src = 192.168.30.20 : 2500 src = _ _(E)___ dst = ___(F)__ : _(G)_ : _(H)_ (H2 dst = 134.210.1.99 : 80 The two host computers are each sending a packet to the same web server on the Internet. Show the changes made by NAT to the IP addresses and port numbers of each packet as they are sent (provide your own sample values in cases where the actual values cannot be determined.). co w o I

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