Protocols Per Layer
Description:
Protocols are methods that computers use to talk to each other. Throughout your IT career you will learn different ones and how they relate to the OSI model.
- You can view common ports on the home page or here
- I recommend you download all the cheat sheets from the site here
Popular Protocols:
Port Number | Protocol Name | Description |
---|---|---|
21 | FTP | File Transfer Protocol |
22 | SSH/ SCP | Used for secure connections |
25 | SMTP | Used to send emails |
53 | DNS | Used to translate IP to domain names |
80 | HTTP | Protocol used to browse the web. More info here |
110 | POP3 | Email Protocol |
143 | IMAP4 | Email Protocol |
161-162 | SNMP | Network device communication protocol |
443 | HTTPS | Secure HTTP |
989-990 | FTP over SSL | Secure FTP |
993 | IMAP4 over SSL | Secure IMAP |
995 | POP3 over SSL | Secure POP |
Layer 1 Protocols: The Physical Layer
- ADSL => Asymmetric digital subscriber line
- ISDN => Integrated Services Digital Network
- PDH => Plesiochronous Digital Hierarchy
- T-carrier => (T1, T3, etc.)
- E-carrier => (E1, E3, etc.)
- RS-232 => a serial line interface originally developed to connect modems and computer terminals
- SDH => Synchronous Digital Hierarchy
- SONET Synchronous Optical NETworking
- Modem standards/ITU V-Series Protocols used to communicate between analog modems over voice telephone lines.
- Various Ethernet physical layers
Layer 2 Protocols: Data Link Layer
- ARCnet
- CDP Cisco Discovery Protocol
- DCAP Data Link Switching Client Access Protocol
- Dynamic Trunking Protocol
- Econet
- Ethernet
- FDDI Fiber Distributed Data Interface
- Frame Relay
- HDLC High Level Data Link Control
- IEEE 802.11
- IEEE 802.16
- LocalTalk
- L2F Layer 2 Forwarding Protocol
- L2TP Layer 2 Tunneling Protocol
- LAPD Link Access Procedures on the D channel
- LLDP Link Layer Discovery Protocol
- LLDP-MED Link Layer Discovery Protocol => Media Endpoint Discovery
- PPP Point-to-Point Protocol
- PPTP Point-to-Point Tunneling Protocol
- Q.710 Simplified Message Transfer Part
- NDP Neighbor Discovery Protocol
- SLIP Serial Line Internet Protocol (obsolete)
- StarLan
- STP Spanning Tree Protocol
- Token ring
- VTP VLAN Trunking Protocol
Layer 2+3 Protocols:
- ATM Asynchronous Transfer Mode
- Frame relay, a simplified version of X.25
- MPLS Multi-protocol label switching
- X.25
- ARP Address Resolution Protocol
- RARP Reverse Address Resolution Protocol
Layer 1+2+3 Protocols:
- MTP Message Transfer Part
- NSP Network Service Part
Layer 3 Protocols: Network Layer
- CLNP Connectionless Networking Protocol
- EGP Exterior Gateway Protocol
- EIGRP Enhanced Interior Gateway Routing Protocol
- ICMP Internet Control Message Protocol
- IGMP Internet Group Management Protocol
- IGRP Interior Gateway Routing Protocol
- IPv4 Internet Protocol version 4
- IPv6 Internet Protocol version 6
- IPSec Internet Protocol Security
- IPX Internetwork Packet Exchange
- MPLS Multiprotocol Label Switching
- SCCP Signalling Connection Control Part
Layer 3 Protocols: Network Layer management
- IS-IS Intermediate system to intermediate system
- OSPF Open Shortest Path First
- BGP Border Gateway Protocol
- RIP Routing Information Protocol
Layer 3.5 protocols
- HIP Host Identity Protocol
Layer 3+4 protocols
- Xerox Network Services
Layer 4 Protocols: Transport Layer
- AHAH Authentication Header over IP or IPSec
- ESPESP Encapsulated Security Payload over IP or IPSec
- GRE Generic Routing Encapsulation for tunneling
- IL Originally developed as transport layer for 9P
- SCTP Stream Control Transmission Protocol
- Sinec H1 for telecontrol
- SPX Sequenced Packet Exchange
- TCP Transmission Control Protocol
- UDP User Datagram Protocol
Layer 5 Protocols: Session Layer
- 9P Distributed file system protocol developed originally as part of Plan 9
- NCP NetWare Core Protocol
- NFS Network File System
- SMB Server Message
Layer 7 Protocols: Application Layer
- AFP, Apple Filing Protocol
- BACnet, Building Automation and Control Network protocol
- BitTorrent, A peer-to-peer file sharing protocol
- BOOTP, Bootstrap Protocol
- Diameter, an authentication, authorization and accounting protocol
- DICT, Dictionary protocol
- DNS, Domain Name System
- DHCP, Dynamic Host Configuration Protocol
- ED2K, A peer-to-peer file sharing protocol
- FTP, File Transfer Protocol
- Finger, which gives user profile information
- Gnutella, a peer-to-peer file-swapping protocol
- Gopher, a hierarchical hyperlinkable protocol
- HTTP, HyperText Transfer Protocol
- IMAP, Internet Message Access Protocol
- IRC, Internet Relay Chat protocol
- ISUP, ISDN User Part
- Jabber, an instant-messaging protocol
- LDAP Lightweight Directory Access Protocol
- MIME, Multipurpose Internet Mail Extensions
- MSNP, Microsoft Notification Protocol (used by Windows Live Messenger)
- MAP, Mobile Application Part
- NetBIOS, File Sharing and Name Resolution protocol => the basis of file sharing with Windows.
- NNTP, News Network Transfer Protocol
- NTP, Network Time Protocol
- NTCIP, National Transportation Communications for Intelligent Transportation System Protocol
- POP3 Post Office Protocol Version 3
- RADIUS, an authentication, authorization and accounting protocol
- Rlogin, a UNIX remote login protocol
- rsync, a file transfer protocol for backups, copying and mirroring
- RTP, Real-time Transport Protocol
- RTSP, Real-time Transport Streaming Protocol
- SSH, Secure Shell
- SISNAPI, Siebel Internet Session Network API
- SIP, Session Initiation Protocol, a signaling protocol
- SMTP, Simple Mail Transfer Protocol
- SNMP, Simple Network Management Protocol
- SOAP, Simple Object Access Protocol
- TUP, Telephone User Part
- Telnet, a remote terminal access protocol
- TCAP, Transaction Capabilities Application Part
- TFTP, Trivial File Transfer Protocol, a simple file transfer protocol
- WebDAV, Web Dist Authoring and Versioning
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