Question: Part I 

Allude to the organization figure above, showing two Ethernet Subnets associated through an IP Router, for questions #1 to #5. For every gadget, the two its Internet Protocol (IP) address and its MAC address (likewise called the Physical location or the Ethernet address) are shown. The Subnet Mask utilized by all gadgets is 255.255.255.240 (which is same as prefix length "/28").

(5 focuses) Assume that the Ethernet Switch Forwarding table begins vacant, and afterward Client #2 sends a parcel to Client #3 and afterward Client #3 sends an answer bundle back to Client #2. After these parcel transmissions are done, show me the substance of the Forwarding Table (MAC Address Table) of the Ethernet Switch. There are 3 switch ports, named Fa0, Fa1 and Fa2. Your responses should show values for these 2 segments: Macintosh Address Switch Port

(3 focuses) The IP Subnet ID for the right subnet, containing the Web Server is 160.16.0.64/28. What is the first and last assignable IP address in this subnet? (3 focuses) If Client #1 needs to send a transmission bundle to all gadgets on the left subnet, what IP objective would it be advisable for it to ship off? At the end of the day, what is the IP Broadcast address for the left subnet above? Presently, accept that Client #1 communicates a bundle to the Web Server. What are the particular numeric location values (duplicated from the outline over) that will be in every one of the accompanying header fields of this parcel sent by Client #1? (2 focuses) Source Address in Ethernet header (3 focuses) Destination Address in Ethernet header (2 focuses) Source Address in IP header (3 focuses) Destination Address in IP header (4 focuses) Assume that the Web Server as of now has a TCP association set up with Client #1 and the Web Server needs to send 2 information parcels - Packet An and Packet B (in a specific order) - to Client #1. Parcel An is sent with TCP Sequence Number = 2480 and contains 1000 information bytes. Parcel B contains 1200 information bytes. What Sequence Number worth will the Web Server put in the TCP header of Packet B (sent just after Packet A)?

Part II (25 focuses)

To respond to these inquiries, you will utilize Wireshark programming - see class notes and 1/28 talk on the most proficient method to utilize this product. On January 27, 2020 I utilized Wireshark on my office PC to catch 9 information bundles that were sent and gotten by my Office Computer when I composed this URL into my Firefox program: http://facweb.cdm.depaul.edu/brewsterames.html . I put away this caught bundle information into record HW2-trace.pcap. Here is a chart showing IP locations of my office workstation, my default door and the facweb server. My Office Computer likewise traded parcels with a DNS server (not displayed in graph).

In the wake of evaluating the Wireshark slides canvassed in class on 1/28, fire up your own Wireshark programming and open the HW2-trace.pcap record. You should see synopsis data for the 9 parcels that were caught when I downloaded the page.

Click on every bundle at top to see nitty gritty data in center and base sheets. Utilize this data to respond to questions #6-#10.

(3 focuses) For the 9 bundles - numbered parcel #1 through bundle #9: Which bundles (list the parcel numbers) were sent by my Office Computer? Which bundles (list the parcel numbers) were gotten by my Office Computer? (3 focuses) Why does my Office Computer send parcel #1? Parcel #2 is a reaction to bundle #1. What data does my Office Computer get from parcel #2 that it didn't know previously? What are the accompanying qualities? Let me know these numeric qualities from the Wireshark record: (2 focuses) The IP address of my DNS Server. (2 focuses) The Ethernet MAC address of my Office Computer. (2 focuses) The private TCP port number related with my Firefox program window (3 focuses) What is the reason for bundles #3, #4 and #5? What do they achieve? Bundles #7 and #8 contain the substance of the site page itself, downloaded from a record named names.html on the facweb server. This website page must be broken into 2 bundles for download in light of the fact that every parcel can contain something like 1500 bytes, including TCP and IP headers. (2 focuses) What is the Sequence Number worth in the TCP header of bundle #7 (relative succession number is fine)? (2 focuses) what number bytes of the page are sent in Packet #7? This is displayed as the TCP Payload length or TCP Segment length in Wireshark and it is somewhat less than 1500. (2 focuses) What is the Sequence Number worth in the TCP header of parcel #8 (relative succession number is fine)? Is this worth equivalent to the amount of your responses for 10(a) and 10(b)? On the off chance that you click on Packet #8 and, click "Reassembled TCP" tab at base, it will show a reassembly of the two parcels #7 and #8 (the whole site page). Tapping on #7 or #8 and "Casing" tab at base shows just the substance of that specific bundle. The Name Alex Martinez is in bundle #7 or #8. Utilize just the Frame tabs to answer the accompanying: (2 focuses) Which parcel (#7 or #8) contains The Name Alex Martinez? (2 focuses) Grab a screen capture of the Wireshark window The Name Alex Martinez apparent in the base Wireshark sheet (which contains the hexadecimal and character values for every byte of the bundle) and glue that screen capture here.

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