TCP & UDP Ports

Question 1

A number used to uniquely identify a Network connection. It specifies the service or application. Ie: Port 80 is Web Server, Port 8444 is a client port. A port is an open doorway.
Port does not mean that it gives outsiders full access however the port can be exploited. There are security risks - if firewalls or routers are not in the network. FTP is open and not secure.

Answer 1

What is a TCP or UDP Port?

Question 2

0 - 1023 most common already reserved (ie: Apple)

Answer 2

Well-known Ports

Question 3

1024 to 49151 companies can register with IANA. A range of ports a company can register when creating an application or service that has a certain protocol needs to communicate via a TCP or UDP port

Answer 3

Registered Ports

Question 4

(https://www.iana.org) look at different ports

Answer 4

IANA (Internet Assigned Numbers Authority)

Question 5

49152 to 65535 (anyone can use these)

http://www.iana.org/assignments/port-numbers

Answer 5

Private Ports

Question 6

Responsible for data getting in proper order.
Congestion control
Error-free
Flow control/sliding window (increase the flow or decrease the flow)
Favors safety/accuracy over speed
Used for reliable communication.
Connection-oriented 3-way handshake (syn, syn-ack, ack)
Connection Termination (Fin, Ack, Fin-Ack, Ack)
Sequence # and Acknowledgment # (UDP does not use these)
TCP data unit called segment

Answer 6

TCP (Transmission Control Protocol) Connection-oriented

Question 7

No security in sending data
It will get there when it gets there
Favors speed over safety
Used when loss can be tolerated
Length & Checksum (checksum makes sure data gets there)
Simplicity means that it's very fast
Unreliable delivery doesn't mean bad
Not ordered
No congestion control
Lightweight, faster than TCP
Ie: UDP online gaming real- time, voip real-time traffic (can use tcp to setup connection) voice goes over UDP
UDP data unit called datagram

Answer 7

UDP (User Datagram Protocol) Connection-less

Question 8

CRC Data TCP/UDP Header: (Source Port: 8444; Destination Port: 80)

IP Header: (Source IP: 192.168.100.2; Destination IP: 8.8.8.8)

MAC Header: (Source MAC: AA-AA-AA-AA-AA-AA; Destination MAC: BB-BB-BB-BB-BB-BB)

Answer 8

Parts of a Frame

Question 9

DATA - TCP/UDP Header - IP Header

Answer 9

Packet or a Datagram

Question 10

DATA - TCP/UDP Header

Answer 10

Segment or Datagram