Describe a hypothetical scenario in which two computers share a video file via an unsecured FTP connection with a susceptible TCP three-way handshake.

What is the most common way that the TCP three-way handshake could be used against a video file being sent over an insecure FTP connection?

Draw a sequence diagram for the following scenario. In a network, two nodes communicate with each other. These are the sequence. 1) Node J sends ping message to Node L 2) Node L sends ICMP echo reply to node L. Now Node A is having the MAC address of Node L. 3) Node J starts TCP handshake with Node L by sending SYN message. 4) Node L sends (SYN+ACK) back to node J. 5) Node J sends the ACK to Node L.

TCP demands all parties, including endpoint operating systems, to be transparent. How can one endpoint trick the Transmission Control Protocol (TCP)?

Draw a complete TCP 3-way handshake logical diagram of an HTTP session with a website session.

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…

Consider the UDP header 00 1E A3 10 12 03 00. HOW LONG DOES THE ENTIRE UDP PROCESS TAKE?

Upon seeing a wireshark recording of a conversation. How exactly would one go about determining what the demultiplexing key for a TCP stream is?

In Section 5.7 we saw that it was preferable to transport SNMP messages in unreliable UDP datagrams. Why do you think the designers of SNMP chose UDP rather than TCP as the transport protocol of choice for SNMP?

Consider sending a transaction from a distant device to a server. Do you prefer TCP or UDP? Why is this so?