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Network port number

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byronmazariegos's version from 2015-09-14 14:50

PORTS TO MEMORIZE

Question Answer
RPC remote procedure callport 135
FTP data port (active mode)TCP 20
FTP control portTCP 21
SSHTCP 22
SCP (uses SSH)TCP 22
SFTP (uses SSH)TCP 22
TelnetTCP 23
SMTPTCP 25
TACACS+TCP 49
DNS name queriesUDP 53
DNS Zone TransfersTCP 53
TFTPUDP 69
HTTPTCP 80
KerberosUDP 88
POP3TCP 110
SNMPUDP 161
SNMP trapUDP 162
NetBIOS (TCP ralely used)TCP/UDP 137
NetBIOSUDP 138
NetBIOSTCP 139
IMAP4TCP 143
LDAPTCP 389
HTTPSTCP 443
SMTP SSL/TLSTCP 465
IPsec (for VPN with IKE)UDP 500
LDAP/SSLTCP 636
LDAP/TLSTCP 636
POP SSL/TLSTCP 993
L2TPUDP 1701
PPTPTCP 1723
Remote desktop Protocol (RDP)TCP/UDP 3389
Microsoft SQL ServerTCP 1433
memorize

 

Question Answer
DNS Domain Name SystemTCP,53 port used DNS zone transfers
HTTPSTCP 443 Port used for secure web traffic.
HTTPTCP 80 Internet protocol for delivering web pages to the browser.
FTP dataTCP 20 - Port used by FTP to send data to a client.
FTP controlTCP 21 - Port used by FTP commands sent to the server.
SSH22 Port used to encrypt remote access communication. It typically is used as a secure replacement to Telnet.
SFTPTCP 115 Simple File Transfer Protocol.
POP3TCP 110 Port used by the Internet protocol to read e-mail.
SMTPTCP 25 Port used to send Internet email.
NetBIOSTCP 139 Port used to establish connection between two systems.
Telnet23 port used to remotely connect to a system such as a server or router.
RDP3389 port used for remote administration of a Windows system.
IMAP143 Newer Internet Protocol port used to read email.
memorize

UDP PORTS

Question Answer
DNSUDP port 53 is used for DNS queries
DHCPUDP port 67 is used by DHCP service
DHCPUDP port 68 is used by client requests
TFTPUDP port 69 is used to download files without requiring authentication
NetBIOSUDP port 137 & 138 used by the NetBIOS name service and datagram service
SNMPUDP port 161 is used by the Simple Network Management Protocol
memorize

TCP Three-Way Handshake/FLAGS

Question Answer
SYNthe SYNchronize flag is assigned to any packets that are part of the SYN phases of the Tree-way handshake
ACKthe ACKnowledgement flag acknowledges that a previous packet has been received.
PSHthe PuSH flag is designed to force data on an application
URGthe URGent flag specifies that a packet is an urgent packet.
FINthe FINish flag specifies that you would like to finalize, or end, the connection like saying goodbye (polite way)
RSTthe ReSeT flag is used to end a TCP connection without saying goodbye (impolitely)
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Abbrevation

 

Question Answer
TCPTransmission Control Protocol
SYNSynchronize
ACK/SYNAcknowledgement Synchronize
ACKAcknowledgement
UDPUser Datagram Protocol
IPInternet Protocol
ICMPInternet Control Message Protocol - responsible for error and status two programs that use ICMP are PING and TRACERT
ARPAddress Resolution Protocol - responsible for converting an IP address (layered-3 address) to the physical MAC address (layer-2 address)
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AUTHENTICATION FACTORS

 

Question Answer
Something you knowa password or PIN
Something you havea smart card or USB token
Something you area fingerprint or other biometric identification
Somewhere you areyour location using geolocation technologies
Something you dogestures on a touch screen
memorize

APPLICATION LAYER PROTOCOLS / ABBREVATION

Question Answer
HTTPHypertext Transfer Protocol - used on the internet to allow clients to request web pages from web servers and to allow client interaction with those web servers
HTTPSHypertext Transfer Protocol Secure - used to connect to a web site and to receive and send content in a n encrypted format using SSL.
SSLSecure Sockets Layer
DNSDomain Name System - service used to convert fully qualified domain names Example: (www.CNN.com) to IP address (20.10.05.10)
SMTPSimple Mail Transfer Protocol - used to send or route mail over a TCP/IP network such as the internet. Protocol for sending email
POP3Post Office Protocol version 3 - used to retrieve e-mail from mail server down. protocol for reading email
IMAP4Internet Message Access Protocol version 4 - similar to POP3 protocol for reading email
SNMPSimple Network Management Protocol - an standard that provides a simple method for remotely managing virtually any network device that support SNMP over UDP
FTPFile Transfer Protocol - protocol that exists to upload and download file between FTP servers and clients.
TFTPTrivial File Transfer Protocol - simple protocol compared with FTP and supports only reading and writing to files.
SFTPSecure File Transfer Protocol - an interactive file transfer protocol similar to FTP.
TELNETTerminal Emulation Protocol _ allows a client to run or emulate the program running on the server.
SSHSecure Shell - program used to created a shell, or session, with a remote system using a secure connection
SCPSecure Copy Protocol - responsible for copying files from a remote server to the local system over a secure connection, ensuring data transmit is kept confidential.
NTPNetwork Time Protocol - used to synchronize the clocks of PC's on the network or the Internet.
LDAPLightweight Directory Access Protocol - is the TCP/IP protocol for directory service access that is supported by all the principal directory services.
NetBIOSNetwork Basic Input/Output System - an application programming interface that is used to make network calls to remote systems and session management functionality
memorize

THINGS TO KNOW FOR THE TEST

Question Answer
VLANSare a way to create communication boundaries on the network BY DEFAULT one VLAN cannot communicate with systems in another VLAN.
PROXY SERVERmakes the request for the internet resource on behalf of the user and commonly the company will filter and log what web sites users have visited
FIBER OPTICis more secure cable type because it does not carry and electrical signal, but instead carries data as pulses of light.
TCP and UDPare considered layer-4 (transport) protocols.
ICMPprotocol in the TCP/IP protocol suite that is responsible for error and status reporting (PING and Tracert use ICMP), ICMP type 8 is used by the echo request message, and ICMP type 0 is used by echo reply.
IPis a layer 3 protocol of the OSI model responsible for logical addressing and routing.
HTTPuses TCP port 80
HTTPSuses TCP port 443
POP3 & IMAP4are the internet protocols for reading email
SMTPis the Internet protocol for sending email.
FTPused two ports 20 and 21 (20) is responsible for transferring the data between two host in a FTP session. (21) carries the FTP commands from one system to another.
IPv4uses a 32 bit addressing scheme
IPv6is a 128 bit address scheme that uses a hexadecimal address format.
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