Physical - Logical and Port Addresses

Questions: 1. With respect to TCP/IP;a) Describe what physical, logical and port addresses are and why they are required. b) Provide a real example of a physical, logical and port address - this should be from your own computer on your own network, or a lab computer or a work computer include details of how you obtained each of the addresses and include a screen shot displaying each address for the port address identify the application or program that is using it. 2. An organisation has been granted a block of addresses starting with the address 172.154.68.0/22. a) Create 3 subnets for this organisation with the first subblock of 250 addresses, the second subblock of 60 addresses and the third subblock of 12 addresses. for each correct answer) b) How many addresses are left? Question 3a) Provide two reasons why you think dynamically assigning IP addresses are useful? b) Is the IP address 192.168.12.254 a valid address for use by a computer connected directly to the Internet? Explain your answ er.c) Is it possible to divide a class C network into 14 subnets with 15 computers connected to each sub network? Explain your answer.4. A sending application has sent 1240 bytes to a receiving application using TCP. The congestion window (cwnd) is set at 200 bytes (assume it does not change for the duration). The receiving application has sent an acknowledgement number of 1180 with a receiver window (rwnd) of 120 bytes. a) Draw a diagram showing the sliding window and next byte pointer similar to the example provided below based on the details given above.b) The sending application then receives a further acknowledgment of byte 1220 with an rwnd of 100 bytes. Draw a diagram representing the new sliding window and next byte pointer. c) The sending application then sends a further 80 bytes to the receiving application, which responds soon after with an acknowledgement of byte 1300 with an rwnd of 80 bytes. Draw a diagram representing the new sliding window and next byte pointer. d) W hat is the maximum amount of data the sending application can send at this time? Answers: 1 a: Physical address is a local addressof any computer,itlinksinformationfrom a node to any other node on theinterconnected nodes.Logical addresstells the sender as well as thereceiveronthe network layer.Logical addresssendsbytesover the networksfor communication. The port address recognizes the application process on the station they are used for communication over a large number of nodes or work stations. 1 B: Physical address:- 1C-65-9D-1C-28-EC Logical address:- 192.168.1.11 Port address:- 53071 This port is used by chorme.exe for establishing a connection 2 a: IP Version4is a 32 bit binary number./22 means thatwe have10 bits onthe hostsideand22bitson the networkside. Binary addresses in decimal notation is71.255.256and172.154.68.0. According to8 bits in host side, we will have 256 values andfor the 250 blocksweuse68.00/24.The next free addressis 69.00.6 bitsare neededfor 60addresses,firstbinary rangeis 64.26addresses areUsedby69.00/26.Thissizetakes 69.00 - 69.63andnextblockbeginsfrom69.64.We need16 valuesfor twelveaddresses, so we have to mask28.The Block 69.64/28.The three ranges are the remainingof that /176addresses are added with512 addresses and totalbecomes688. 2 b: The 250 addresses in address/24, so256 addresses can be there,ithas 4 addresses left, in additionnetwork broadcast. The 60 in 64 has 2. The 12 in 16 has 2. 3 a: Dynamic IP address isthat modifies itselffrom time to time. Dynamic IP address for DSL servicewill be assigned byInternet Service Providers. TheDynamicInternetProtocoladdress is takenfrom the poolandassignedto the user.ThatIPaddressgets back into the pool and you aregivena newIP address. So a dynamic IP address can make it a problemofremoteaccess to any computeror webcam, because if we havethe IP address of that node, it will be changed automatically after some period of time or will be changed after an assigned period of timeSo if you are at any other place and want to use the PCremotely, and you have a wrong Internet Protocol address, you will not be able to use/connect to your computer. 3 b: 192.168.12.254 is a valid address, because it is Class C IP address and its range is 192.168.0.0 - 192.168.255.255. 3c: No,In a class C address we use 4 bits for the subnet mask,whichwill be16 subnets,and4 bitsare leftfor host, whichwill be16.Host addresscannot be0andwecan not have the host address of all 1's. 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