The Transport and Application layer summary

A connection has been terminated and no communication is possible. What is the TCP socket state?

Closed

In the OSI network model, ________is responsible for making sure that the encapsulated application layer is actually able to be understood by the application in question.

Presentation layer

A TCP connection is established and two devices ensure that they're speaking the same protocol. What has occurred?

Three way handshake

What port does the File Transfer Protocol (FTP) typically listen on?

21

The OSI network model has _____ layers?

7

Which field in the TCP header provides the information for the receiving network device to understand where the actual data payload begins?

Data offset

Nodes on a network have the ability to direct traffic toward many different receiving services. What provides this ability in the transport layer?

Multiplexing

You are sending a very small amount of information that you need the listening program to respond to immediately. Which Transmission Control Protocol (TCP) flag will be used?

PSH

The transport layer handles multiplexing and demultiplexing through what type of device

Ports

Which TCP flag is used to make sure the receiving end knows to examine the sequence number number field?

SYN

A communication sent through TCP arrives out of order. What allows the data to be put back together in the correct order?

Sequence numbers