2.1 Ports & Protocols

Question 1

Internet protocol package

Answer 1

(Ethernet header, ip, tcp, http data, ethernet trailer)

Question 2

TCP

Answer 2

Transmission control protocol

• Formal connection setup and close
• reliable, has recovery for errors
• flow control
• –> can manage how much data is sent, because TCP ack messages are sent

Question 3

UDP

Answer 3

User datagram protocol

• connectionless, no formal open or close connection (no handshakes)
• unreliable
• • no acknowledgement of data reception, no recovery

No flow control
- sender just decides how much to send

Question 4

Packet transportation (IP)

Answer 4

• goes from IP address to another IP (house)
• MAC to enter lock in door
• room number - Port

Question 5

Ipv4 sockets

Answer 5

Server IP address, protocol, server app port number

Client IP address, protocol, client port number

Question 6

Non-ephermal ports-

Answer 6

permanent port #’s

Usually port numbers assigned to applications on server

Server ports: 0-1023

Question 7

Ephermal ports

Answer 7

Temporary port numbers

Client ports: 1024 - 65 535

Chosen in realtime by client

Question 8

TCP ports

Answer 8

Can range from 0 - 65,535

Question 9

Udp ports

Answer 9

Can range from 0 - 65,535

Question 10

FTP

Answer 10

File transfer protocol, transfers files between systems

Tcp/20 (active mode data port)

Tcp/21(controls communication)

Authentication:

• can use security username and password
• can use anonymously by typing in anonymous

Full featured functionality
-list,add,delete

Question 11

SSH & port

Answer 11

Secure shell

Allows for encrypted communication on console level (ex. Command line)

Tcp/ Port 22

Question 12

Telnet

Answer 12

Communication to console but not encrypted

Tcp/port 23

• not commonly used on network - outdated

Question 13

SMTP

Answer 13

Simple mail transfer protocol

Used to send messages from a mobile device or server to server

-port: tcp/25

Question 14

DNS & port

Answer 14

Domain name system

Converts names to IP addresses

Port: UDP/53

Question 15

HTTP & port

Answer 15

Hypertext transfer protocol

Communication with web browser to web server

Port: tcp/80

Question 16

HTTPS

Answer 16

Encrypted version of HTTP

Port TCP/443

Question 17

Pop3 & port

Answer 17

Post office protocol version 3

Receives emails from email server and authenticates

Tcp/110

More outdated

Question 18

IMAP4 & port

Answer 18

Internet message access protocol

Receives emails from server

Port: Tcp/143

Question 19

Remote desktop protocol & port

Answer 19

Allows for remote desktop control

Port: TCP 3389

Question 20

SMP

Answer 20

server message protocol

Aka: CIFS ( common internet file system)

Used by Microsoft windows instead of FTP.

Allows for file sharing

Port tcp/445 (no netbios)

Question 21

AFP & port

Answer 21

Apple filing protocol

File service in Mac OS

Port: tcp/548

Allows for file management: delete, move

Question 22

SLP

Answer 22

Service location protocol

Populates lots of available devices for use with AFP

Ports: TCP/427 & UDP/427

Question 23

DHCP & port

Answer 23

Dynamic host configuration protocol

Automated configuration of IP address and subnet

UDP/67 & UDP/68

Has lease time, for how long it can use

Question 24

LDAP & port

Answer 24

Lightweight directory access protocol

Database used for authentication

Credentials stored in it, commonly in active directory

TCP/389

Question 25

SNMP & port

Answer 25

Simple network management protocol Monitors and gathers statistics from devices Ports - quieries: Udp/161 Traps: udp/162 V3- provides message integrity, authentication, encryption