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- Please solve it correctly and please provide explanation of your answers. Please answer parts g, h and i. A PC and a Web Server are communicating over a TCP connection. The PC had started the three way handshake with the initial sequence number of 3069 . The Web Server's initial sequence number is 4830 . The window size of the PC is 815 bytes and the window size of the Web Server is 463 bytes. Using the third TCP handshake ack segment the PC sends the http request of the size 396 bytes to the Web Server. Then the Web Server answers with 3 segments containing the requested data. The first segment size is 42 bytes and the second segment size is 276 bytes and the third segment size is 146 bytes respectively. The PC receives all three segments within the timer. But unfortunately the second segment was corrupted. So the PC immediately sends an acknowledgement segment. Assume that the PC uses Selective Repeat/Reject ARQ. g) The second segment from webserver was corrupted. So the PC…Consider a 2G - GSM mobile phone which has been turned off for a while. The user turns it on and tries to make a phone call to another mobile phone in the same mobile operator's network which is also a 2G network. Write down ALL messaging between various components of the GSM architecture and the mobile phone being turned on until the call is established (so do not consider the other side of the phone call) in a timeline with appropriate messaging and names of the channels being used. When making a phone call assume that the user fails in the first 2 random- access trials and succeeds on the 3rd random-access trial.Please solve it correctly and please provide explanation of your answers. A PC and a Web Server are communicating over a TCP connection. The PC had started the three way handshake with the initial sequence number of 3069 . The Web Server's initial sequence number is 4830 . The window size of the PC is 815 bytes and the window size of the Web Server is 463 bytes. Using the third TCP handshake ack segment the PC sends the http request of the size 396 bytes to the Web Server. Then the Web Server answers with 3 segments containing the requested data. The first segment size is 42 bytes and the second segment size is 276 bytes and the third segment size is 146 bytes respectively. The PC receives all three segments within the timer. But unfortunately the second segment was corrupted. So the PC immediately sends an acknowledgement segment. Assume that the PC uses Selective Repeat/Reject ARQ. (d) What will be the window size of PC A after receiving only the first segment from webserver? (e)…
- Please solve it correctly and please provide explanation of your answers. A PC and a Web Server are communicating over a TCP connection. The PC had started the three way handshake with the initial sequence number of 3069 . The Web Server's initial sequence number is 4830 . The window size of the PC is 815 bytes and the window size of the Web Server is 463 bytes. Using the third TCP handshake ack segment the PC sends the http request of the size 396 bytes to the Web Server. Then the Web Server answers with 3 segments containing the requested data. The first segment size is 42 bytes and the second segment size is 276 bytes and the third segment size is 146 bytes respectively. The PC receives all three segments within the timer. But unfortunately the second segment was corrupted. So the PC immediately sends an acknowledgement segment. Assume that the PC uses Selective Repeat/Reject ARQ. (a) What will be the sequence number of the third TCP handshake signal send from PC to webserver?…java programming language Write a simple program that demonstrates the concept of (Multithreads) using more than one channel in the same class. So that the failure of one channel does not affect the otherA Communications is a small phone repair shop. The owner, Ahmet, is currently working alone. Ahmet files his repairs on a customer basis and keeps them in a cupboard. Ahmet knows that he needs to switch to an information system because he wants to expand his business. When the customer brings a phone that needs repair, Ahmet detects the problem, records them in the file and gives the customer time and price information. At the beginning of each day, Ahmet checks the repair list, selects and completes the tasks that need to be done that day. When he sees that there is no required part in stock during the repair, he orders the part to the supplier and postpones that repair work to a future date, informing the customer. When the customer comes to pick up the phone that has been repaired, Ahmet issues an invoice and takes the payment from the customer. Once a week, Ahmet checks the stock and orders the decreasing products to the supplier. In order to develop the information system that…
- A businessman implemented a locking mechanism for the main door using an IOT-powered smart door lock where the VAULT and supplies for the business are stored. The smart door lock is implemented by keying in a 5-digit alphanumeric passcode to open the door and the self-locking mechanism allows the password to be utilized once and is reset when the door is locked again. The store owner encodes the passcode via the network for the door to be opened. Moreover, whenever there is a need to get items from the protected room including the vault, the store manager requests the binary-represented passcode wherein which is passed on to the store manager using SMS using a binary stream that represents the 5 alphanumeric passcodes. The bitstream is utilized to make sure that it is protected and can only be decrypted by someone who knows the process of decoding the binary bitstream. The rules of encoding the binary bitstream follow these steps/information: Bitstream represents a 5-digit…The message validation server is able to validate two types of messages - type A and type B messages correspondingly. It is commonly believed that the validation time of type B message is somewhat longer than the validation of type A message. Additionally, it's commonly believed that the actual validation time depends largely only on the type of messages (A and B types) and doesn't depend in an essential amount on the message content. However, nobody hasn't checked these claims in practice. We have reliable statistics for four different sessions: • 1st session - 17,648 of type A messages and 11,414 type B messages were validated, session lasted 6 minutes and 7.90 seconds. . 2nd session - 6836 of type A messages and 12,618 type B messages were validated, session lasted 4 minutes and 23.80 seconds. • 3rd session - 24,616 of type A messages and 17,648 type B messages were validated, session lasted 8 minutes and 56.10 seconds. . 4th session - 10,684 of type A messages and 12,684 type B…Assignment Consider a 2G - GSM mobile phone which has been turned off for a while. The user turns it on and tries to make a phone call to another mobile phone in the same mobile operator's network which is also a 2G network. Write down ALL messaging between various components of the GSM architecture and the mobile phone being turned on until the call is established (so do not consider the other side of the phone call) in a timeline with appropriate messaging and names of the channels being used. When making a phone call assume that the user fails in the first 2 random- access trials and succeeds on the 3rd random-access trial.
- One of the problems with the Internet email system is that sending forged emails is relatively straightforward, i.e., it is easy to send an email with a fake sender/from address. One solution to this problem would be for a domain’s mail servers to digitally sign any email originating from the domain. For this to be useful, the public key would need to be made available to clients to validate the signatures. It is proposed that the public keys of the mail servers will be verified and signed by a certification authority (same as SSL/TLS certificates) and distributed via a standardised URL for the domain, e.g., https://mybusiness.com/email.pubkey. (a) Explain how the client would obtain the public key and validate the email server’s digital signatures. (b) Discuss the problem of trusting the obtained public key and how this solution results in public keys that can/cannot be trusted. (c) Indicate whether you believe this approach could be used to prevent forged emails and explain why it…A businessman implemented a locking mechanism for the main door using an IOT-powered smart door lock where the VAULT and supplies for the business are stored. The smart door lock is implemented by keying in a 5-digit alphanumeric passcode to open the door and the self-locking mechanism allows the password to be utilized once and is reset when the door is locked again. The store owner encodes the passcode via the network for the door to be opened. Moreover, whenever there is a need to get items from the protected room including the vault, the store manager requests the binary-represented passcode wherein which is passed on to the store manager using SMS using a binary stream that represents the 5 alphanumeric passcodes. The bitstream is utilized to make sure that it is protected and can only be decrypted by someone who knows the process of decoding the binary bitstream. The rules of encoding the binary bitstream follow these steps/information: Bitstream represents a 5-digit…Write a system program in C that implements the client server communication using named pipes. A client is expected to close the channel and kill itself when the character '$' is received. Similarly, the server is expected to close the channel and kill all the clients when character '*' is received.