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- Write a Fixed Size message Send and Receive Pseudo Codes (you can also use C#) for TCP Communication. Fill only the insides of the functions. Unnecessary parts are not assessed (i.e. sockets are ready). Public byte[] SendFixData(Socket s,…) { * Fill the code* for sending fixed size messages* in Tcp Communications } Public byte[] ReceiveFixedData(Socket s,….) { * Fill the code * for receiving fixed size messages * in Tcp Communications}.For IP address: 175.30.101.205, use the provided version of the subnet mask to calculate the: slash notation binary subnet mask dotted decimal subnet mask Increment Network ID Broadcast ID Host Range Complete the Increment by determining the value of the last network bit for the given subnet mask. It is easiest to observe in the binary representation. Since network IDs will always be multiples of the increment (after the zero subnet) – in the octet that holds the last network bit, use the increment to determine the network ID, broadcast, and host range for the IP address displayed above10101100.00010000.0100011.00000101 (binary for 172.16.67.5) AND 11111111.11111111.11000000.00000000 (binary for 255.255.192.0) 10101100.00010000.01000000.00000000 (binary for 172.16.64.0) Network ID is 172.16.64 This is where i got tripped up My book says that the remaining bits represent the HOST ID. My book is saying the remaining digits are 00000011.00000101 equaling to the decimal 3.5. please help me understand how its getting this 3.5. I understand everything else so far converting from decimal to binary and back. But this number threw me off.
- An organization is given a block of addresses and one of the addresses in the block is 8.16.32.64/27. You need to create four variable length subnets: one subnet of 60 addresses, one subnet of 30 addresses, and one subnet of 12 addresses and one subnet of 12 addresses. Design the subnets by finding the subnet mask, the first address and the last address for each subnet. Also identify the range of addresses left unused.3. Consider a simple application-level protocol built on top of UDP that allows a client to retrieve a file from a remote server residing at a well-known address. The client first sends a request with a file name, and the server responds with a sequence of data packets containing different parts of the requested file. To ensure reliability and sequenced delivery, client and server use a stop-and-wait protocol. Ignoring the obvious performance issue, do you see a problem with this protocol? Think carefully about the possibility of processing crashing. State conclusion: Provide Proof: Solution:The subnet 222. 20.128.0/20 is allocated to an organization that has 4 departments, show how to subnet this network to 4 independents networks. Give the IP address of each subnet in binary and in dotted decimal notation (a.b.c.d/x) (show your steps, only final answer not accepted).
- 7.1 In IEEE 802.11, open system authentication is accomplished via a simple two-way communication. The client requests authentication, which includes the station ID, which is provided by the server (typically the MAC address). A successful or unsuccessful authentication response from the AP/router is received in response to the previous request from the client. For instance, if the client's MAC address has been expressly omitted from the AP/router setup, a failure may occur.a. What are the advantages of using this kind of authentication scheme?b. What are the security flaws in this authentication method and how may they be mitigated?Read the manual page of arp command, give the complete command line to add an entry to ARP table for network interface eth1 that maps IP address 192.168.2.45 to MAC address 08:01:23:b2:a0:9d, and then the complete command line to delete this entry.A DoS attack has been reported against FTP server 192.168.56.1. FTP traffic spikes were seen prior to the FTP server being taken offline. A network packet capture is delivered to you through this link. From an investigator perspective, what are the IoCs of this case? By following the packet capture analysis methodology, synthesize the right filters that could be used to complete your investigation and answer the following questions: What caused the spikes in FTP traffic? What events took place prior to the FTP server being taken offline? Were any files transferred to/from the FTP server or were any user accounts compromised?
- Suppose you are the system administrator and learn of a keylogger that records keystrokes and sends the log file to server at 103.136.43.25. How do you set up a firewall rule on the router that connect your institution's LAN to the Internet to prevent leaking of information?Consider a simple application-level protocol built on top of UDP that allows a client to retrieve a file from a remote server residing at a well-known address. The client first sends a request with a file name, and the server responds with a sequence of data packets containing different parts of the requested file. To ensure reliability and sequenced delivery, client and server use a stop-and-wait protocol. Ignoring the obvious performance issue, do you see a problem with this protocol? Think carefully about the possibility of processes crashing.Suppose you have following two bytes data (although UDP uses a 16-bit word but we use 8-bit here for the sake of simplicity) Byte1: 00110100 Byte2: 01101001 a) Compute the checksum (this checksum is sent by the sender in UDP header) b) In flight (over the network), least significant bit is corrupted to 1 for Byte1, and least significant bit is corrupted to 0 for Byte2. With this data, what checksum will be computed at the receiver side c) If UDP receiver computes the Internet checksum for the received UDP segment and finds that it matches the value carried in the checksum field, can the receiver be absolutely certain that no bit error have occurred? Explain.