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SSH
Secure ShellEncrypted communication linkPort TCP/22*Looks and acts the same as Telnet TERM 2
SMTP
DEFINITION 2 Simple Mail Transfer Protocol-Server to server email transferPort TCP/25Also used to send mail from a device to a mail server-Commonly configured on mobile devices and email clientsOther protocols are used for clients to receive email-IMAP, POP3RFC 821 was defined originally in 1982*RFC 5321 developed in 2008 (current version) TERM 3
SFTP
DEFINITION 3 Secure Shell File Transfer ProtocolPort TCP/22-Uses SSH File Transfer ProtocolEncrypted Communication*Provides file system functionality-Resuming interrupted transfers, directory listings, remote file removal TERM 4
FTP
DEFINITION 4 File Transfer Protocol*Port TCP/20 (active mode) TCP/ (control)-Transfer files between a client and server on a computer network.-Authenticates with username and pass- Full-featured functionality (list, add, delete, etc) TERM 5
TFTP
DEFINITION 5 Trivial File Transfer Protocol*Port UDP/69-Very simple file transfer app-rea/writes files-No authentication-Not used on prod systems
TELNET
Telecommunication Network*Port TCP/23-Login to devices remotely-Console Access for administration-In-the-clear comms (No encryption)-Not the best for production systems TERM 7
DHCP
DEFINITION 7 Dynamic Host Control ProtocolPort UDP/67 and UDP/68- Automated configuration of IP address, subnet mask and other options-Requires DHCP server-server, appliance integrated into a SOHO router, etc.Dynamic/pooled-IP addresses are assigned in real-time from a pool-Each system is given a lease and must renew at set intervals*DHCP Reservation-Addresses are assigned by MAC-Quickly manage address from one location TERM 8
HTTP
DEFINITION 8 Hypertext Transmission Protocol*Port TCP/80-Web server communication-And by other apps TERM 9
HTTPS
DEFINITION 9 Hypertext Transmission Protocol*Port TCP/80-Web server communication-And by other apps TERM 10
SNMP
DEFINITION 10 Hypertext Transmission Protocol*Port TCP/80-Web server communication-And by other apps
IMAP
Internet Message Access ProtocolPort TCP/143-includes management of email inbox from multiple clientsReceive emails from an email server-Auth and transfer TERM 17
LDAP
DEFINITION 17 Lightweight Directory Access Protocol*Port TCP/389-Store and retrieve info in a network dir TERM 18
LDAPS
DEFINITION 18 Lightweight Access Protocol*Port/636-Non standard implementation of LDAP over SSL TERM 19
H.
DEFINITION 19 Voice over IP signaling-ITU Telecommunication H.32x protocol seriesPort/1720Setup and manage VoIP sessions- Call, ring, hang upOne of the earliest VoIP standards-Still in use today TERM 20
TCP and UDP
DEFINITION 20 Transported inside of IP-Encapsulated by the IP protocolTwo ways to move data from place to place- Different features for different applicationsOperates on OSI Layer 4-The Transport layerMultiplexing-Use many different apps at the same time-TCP and UDP
TCP
Transmission Control Protocol portConnection-oriented-A formal connection setup and close"Reliable" delivery- Recovery from errors-Can manage out-of-order messages or retransmissions*Flow Control-Receiver can manage how much data is sent TERM 22
UDP
DEFINITION 22 User Datagram ProtocolConnectionless-Sends data whenever it is available-Hopes device on other end is ready to receive"Unreliable" Delivery-No error recovery-No reordering of data or retransmissions*No Flow control-Sender determines amount of data transmitted TERM 23
Speed Delivery
DEFINITION 23 The IP delivery truck delivers from one (IP) address to another (IP) address-Every house has an address, every computer has an IP addressBoxes arrive at the house / IP address-Where do the boxes go?-Each box has a room name (bedroom, living room)-With IP we use Port Numbers (80, 443)*Port is written on the outside of the box-Drop the box right into the room TERM 24
A Series Of Moving Vans
DEFINITION 24 Efficiently move large amounts of data-use a shipping truckThe network topology is the road-Ethernet, DSL, cable systemThe truck is the Internet Protocol (IP)-We've designed the roads for this truckThe boxes hold your data- Boxes of TCP and UDPInside the boxes are more things- Application information TERM 25
Port ranges and types
DEFINITION 25 IPv4 sockets-Server IP address, protocol, server application port number-Client IP address, protocol, client port numberNon- ephemeral ports - Permanent port numbers-Ports 0 through 1,023- Usually on a server or serviceEphemeral ports - Temporary port numbers-Ports 1,024 through 65,535-Determined in real-time by the clientTCP and UP ports can be between 0 and 65,535Most servers (services) use non-ephermeral ports-Not always the casePort numbers are for comms, not securityService port numbers need to be well known
