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- A client attempts to synchronize with a time server. It records the round-trip times andtimestamps returned by the server in the tables below.i. Which of these times should it use to set its clock?ii. To what time should it set it?iii. Estimate the accuracy of the setting with respect to the server’s clock. If it is known that the time between sending and receiving a message in the system concerned is at least 8 ms, do your answers change? Table 1 Round-trip (ms) Time (hr:min:sec) 22 10:54:23.674 24 10:54:25.450 19 10:54:28.342 20 10:54:29.742 21 10:54:30.123Assume Client A starts a Telnet connection with Server S. Client B starts a Telnet connection with Server S about the same time. If A and B are distinct hosts, is it conceivable that the source port number in the segments from A to S is the same as the source port number in the segments from B to S?26. A client-server system uses a satellite network, With the satellite at a height of 40,000 kms. What is the best-case delay in response to a request (Note that the speed of light in air is 3,00,000 km/second). a. 133.33 m sec b. 266.67 m sec c. 400.00 m sec d. 533.33 m sec
- It would appear that once the DHCP Offer message is received, that the client may have all of the information it needs to proceed. However, the client may have received OFFERS from multiple DHCP servers and so a second phase is needed, with two more mandatory messages - the client-to-server DHCP Request message, and the server-to- client DHCP ACK message is needed. But at least the client knows there is at least one DHCP server out there! Let's take a look at the DHCP Request message, remembering that although we've already seen a Discover message in our trace, that is not always the case when a DHCP request message is sent. Locate the IP datagram containing the first DHCP Request message in your trace, and answer the following questions. 10. What is the UDP source port number in the IP datagram containing the first DHCP Request message in your trace? What is the UDP destination port number being used? 11. What is the source IP address in the IP datagram containing this Request…Let's say that Host C is running a Web server that listens on port 80. Suppose that this web server is able to maintain persistent connections and responds to requests from both Host A and Host B. Is Host C sending all of the requests over the same connection, or are there many sockets in use? Do each of them have port 80 even though they are broadcast over separate sockets? It's something you need to discuss and provide some clarification on.A large population ALOHA user manages to generate 50 request/sec, including both originals and retransmissions. Time is slotted in units of 40 ms:a. What is the chance of success at the first time?b. What is the probability of exactly k collisions and then a success?c. What is the expected number of transmissions attempts needed?
- Computer Science In Python, I am trying to make a client and server code that passes the payload with the requirements. The client has to specify the length of the data packet, up to max, specify how many times to pass the data packet, and specify the server IPv4 address. Both the client and the server need timer functions and compute the time needed to perform the number of sends both the Client and the server need to display the local and remote IPv4 addresses, total time, and bytes per second. Please help, Thanks.In IEEE 802.11, two-way communication is used to authenticate an open system. In order to authenticate the client, the server must give the station ID (typically the MAC address). Response to the client's previous request is either a successful or failed authentication response from the access point/router. An error may arise if, for example, an AP/router configuration does not include the client's MAC address.In what ways is it advantageous to use this kind of authentication scheme?In what ways does this authentication technique have security vulnerabilities that might be mitigated?Consider the following simple authentication dialogue: C → AS: IDc II Pc II IDv AS → C: Ticket C → V: IDc II Ticket; Ticket = E(Kv, [IDc II ADc II IDv]) Where: C = client AS = authentication server V = server IDc = identifier of user on C IDv = identifier of V Pc = password of user on C ADc = network address of C Kv = secret encryption key shared by AS and V ***Explain the process of this protocol.
- Assume that a client can use UDP to obtain a file from a distant server at a known address. The client initiates the request for a file name, and the server responds with a sequence of data packets containing various file components. To ensure delivery reliability, the client and server use a stop-and-wait protocol. Is there anything else wrong with this protocol aside apparent performance issues? Consider the possibility of process failure.Prior to the introduction of IEEE 802.11i, the security scheme for IEEE 802.11 was Wired Equivalent Privacy (WEP). WEP assumed all devices in the network share a secret key. The purpose of the authentication scenario is for the STA to prove that it possesses the secret key. Authentication proceeds as shown in Figure 24.13 . The STA sends a message to the AP requesting authentication. The AP issues a challenge, which is a sequence of 128 random bytes, sent as plaintext. The STA encrypts the challenge with the shared key and returns it to the AP. The AP decrypts the incoming value and compares it to the challenge that it sent. If there is a match, the AP confirms that authentication has succeeded.A client application connects to a server and sends an operation, and gets a result back. What happens then? Is the connection open, so that the client can send more operations? Answer the question comparing the protocols SMTP, FTP, HTTP, POP and IMAP. What are the pros and cons of keeping the connection open or closing it down after each operation?