6.1.1 - Transport Layer Ports and Connections

Flashcards covering transport layer protocols, ports, and connections.

What is the main concern of protocols at the Transport layer (layer 4)?

Delivery of multiplexed application data.

What do Transport layer headers instruct a host?

They instruct a host what to do with the data in a packet, and optionally, how to verify that it is complete.

Why is each application protocol assigned a unique identification number called a port?

To direct incoming packets to the appropriate service or application.

Which port numbers are preassigned by the Internet Assigned Numbers Authority (IANA) to "well-known" server applications?

0 through 1,023

Where are the "well-known" server application port assignments documented?

iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Which port range has server applications that have been registered?

1,024 through 49,151

What is the designated maximum port number including private or dynamic designations?

Up to 65,535

Client ports are also referred to as what?

Ephemeral ports or source ports

What is used to form a socket?

Combination of the source IP address and port number

How many processes can operate a socket at any one time?

Only one

How is a connection uniquely identified?

Server port plus IP address and client port plus IP address

How is a connection formed?

Client socket requests a service from the server socket.

How is a connection uniquely identified?

The combination of server port plus IP address and client port plus IP address.

How is each socket uniquely identified at the transport layer?

The combination of source IP plus source port uniquely identifies each client socket.

Give an example of running separate web and mail application services using TCP ports.

A server {192.168.1.254} opens T C P ports 80 and 143 to run separate web and mail application services.