If you're unable to connect via SSH to your EC2 instance, which thing should you check and possibly correct to restore connectivity?
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If you're unable to connect via SSH to your EC2 instance, which thing should you check and possibly correct to restore connectivity?
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- 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.When a client wishes to establish a connection to an object that is reachable only via a firewall, it must open a TCP connection to the appropriate SOCKS port on the SOCKS server system. Even if the client wishes to send UDP segments, first a TCP connection is opened. Moreover, UDP segments can be forwarded only as long as the TCP connection remains opened. Why?q13-
- Which of the following statements is true about NIC (Network Interface Card)? There might be multiple correct answers. When operating in "promiscuous" mode, NIC passes every frame received from the network to the kernel. Each NIC has a MAC address. Each NIC has a hardcoded IP address. NIC checks the destination address for every packet, if the address matches the cards MAC address, it is further copied into a buffer in the kernel. Every NIC on the network will hear all the frames on the wire.Let's pretend Host C is running a Web server on port 80. Suppose this Web server allows both Hosts A and B to make persistent connections. Is it possible that Host C is sending several requests over the same socket? Does port 80 exist in each of these connections if they are being sent through separate sockets? You should discuss and elaborate on this.A socket is one endpoint of a two-way communication link between two programs running on the network. A socket is bound to a port number so that the TCP layer can identify the application that data is destined to be sent to. An endpoint is a combination of an IP address and a port number.Discuss about the different types of socket calls using in TCP &UDP.
- In the process of documenting the network, a network engineer will run the show cdp neighbor command on a number of different network devices. What exactly do you want to achieve by carrying out the instructions given in this command?15 Scaling NetworksThink about why "sudo" access is provided. What is the benefit of not logging in as root?
- As the manager, you have authority over StormWind Studios. IP Address Management (IPAM) setup is currently in progress. Because you've previously set up your IP address management server, you can go on to setting up the GPOs needed for IPAM provisioning. Which PowerShell operation generates Provisioned GPOs, which are essential for IPAM to function?A hacker just set up a TCP connection with a web server in Chicago, Illinois, claiming he is coming in with a source IP address that clearly belongs to a network in Copenhagen, Denmark. In examining the session logs, you notice that he was able to complete the three- way handshake for this connection in 10 milliseconds. How can you use this information to prove he is lying?There is a Web server running on Host C that accepts connections on port 80. There are two people, A and B, who are in charge of the website's server infrastructure. All queries go over the same Host C socket. Port 807 sockets all employ permanent connections, and all requests are sent via two separate sockets. Defend your stance in a discussion.