CP multiplexing and demultiplexing. Consider the figure below, with 6 sockets shown across the etwork, and the corresponding Python code at each host. There are four TCP segments in flight. mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 3200) #sockets to clients created via #later calls to mySocket.accept() mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 6515) P1 transport network link physical B source port: ? dest port: ? Segment B destination port # Segment A destination port # Segment C destination port # Segment C source port # P4 Segment B source port # Segment D destination port # Segment D source port # Segment A source port # A source port: ? dest port: ? Ka P5 transport etwork link physical P6 mySocket1 = socket (AF_INET, SOCK_STREAM) mySocket1.bind (myaddr, 6287 ); mySocket2 = socket (AF_INET, SOCK_STREAM) mySocket2.bind (myaddr, 5313 ); D source port: ? dest port: ? source port: ? dest port: ? P2 Which of the following source or destination port number fields in these four segments has the value of 200? P3 transport network link physical

Port 80 is open on Host C, and a Web server is accessible via it. Suppose A and B are in charge of managing the website's server infrastructure. Is the same Host C socket used for all requests? All sockets with port 807 use the server's persistent connections and the requests are routed via two different sockets. Talk about and defend your position.

Please just give a brief explanation about these cybersecurity questions.( Not more than three sentences).

Explain what this rule does: alert tcp any any -> 192.168.1.0/24 80 (content:”|A1 CC 35 87|”; msg:”accessing port 80 on local”).

Three-way handshake is used by a TCP client and a TCP server to establish a connection, as illustrated below:                    1st: client:port1 -> server:port2, SYN                2nd: server:port2 -> client:port1, SYNACK                3rd: client:port1 -> server:port2, ACK  When this client is performing scanning attacks, it will generated a large  number of failed connections. In each failed connection, the three-way handshake fails to complete. People commonly use SYN together with the absence of its corresponding SYNACK in this same TCP session to identify whether this connection is failed.  By investigating the failed connections, an engineer finds that in legitimate/benign cases, if the server does not return SYNACK to the client, the client will not send the ACK packet after SYNACK (e.g., the 3rd packet above). Therefore, this engineer suggests that we can count the failed connections based on the following rules  without considering SYNACK: If a client:port1 sends…

True or False 1. After fast retransmit is invoked, fast recovery cuts the slow start period in half 2. A host sends a segment with a sequence number 35 and a payload of 5 Bytes. The ACK number in that segment is 40 3. TCP segments can only be lost when router queues overflow. Please explain if possible， Thank you!

I made a TCP server using socket python,basically my server can: - Upload (“put”) request: The client should, at the very least, open (in binary mode) the local file defined on the command line, read its data, send it to the server through the socket, and finally close the connection. - Download (“get”) request: The client should, at the very least, create the local file defined on the command line (in exclusive binary mode), read the data sent by the server, store it in the file, and finally close the connection. To avoid accidents, the client should deny overwriting existing files. - Listing (“list”) request: the client should, at the very least, send an appropriate request message, receive the listing from the server, print it on the screen one file per line, and finally close the connection. I want you to draw an ER diagram that can show the process above please.

Match left-column statements to right-column architectures. Always-on server. Processes may provide or receive service. Any communication has a client and server. It's HTTP. User-controlled hosts may be up or down. Self-scalable. A. Peer-to-peer. B. Not client-server or peer-to-peer. C. Client-server/peer-to-peer. D. Client-server. E. TCP/IP.

C Programming:  Write a program that optionally accepts an address and a port from the command line. If there is no address and port on the command line, it should create a TCP socket and print the address (i.e. server mode). You can choose any port number for your server (>1024). If there is an address and port, it should connect to it (i.e., client mode). Once the connections are set up, each side should enter a loop of receive, print what it received, then send a message. The ping from the client should be sent before entering that loop to start the process. Otherwise both sides will sit and listen without getting anything. The message should be ping from the client and a pong from the server. In order to test this on one machine, you will need to run the same program twice (in two separate terminals). Run first in server mode, then run in client mode using the information printed from the server as your command line arguments. This is the output it must print out: Running…

import socket def authenticate_user(tcp_socket):    while True:        response = tcp_socket.recv(1024).decode()        print(response)        username = input()        tcp_socket.sendall(username.encode())        response = tcp_socket.recv(1024).decode()        print(response)        password = input()        tcp_socket.sendall(password.encode())        auth_response = tcp_socket.recv(1024).decode()        if "successful" in auth_response:            print(auth_response)            return True        else:            print(auth_response) def receive_items(tcp_socket):    while True:        response = tcp_socket.recv(1024).decode()        if "Item List:" in response:            print(response)            while True:                item = tcp_socket.recv(1024).decode()                if not item.strip():                    break                print(item)            break def select_items(tcp_socket):    selected_items = []    while True:        item_id = input("Select item by entering…