OSI Model

Quick ref table on each layers of OSI Model

✔ Application Layer

Protocol	Transport Port Number	Trasport Protocol used
HTTP	80	TCP/UDP
HTTPs	443	TCP/UDP/SCTP
POP	110	TCP/UDP
SMTP	25	TCP/UDP
FTP - Data	20	TCP/UDP
FTP - Control	21	TCP/UDP/SCTP
SSH	22	TCP/UDP/SCTP
Telnet	23	TCP/UDP
DNS	53	TCP/UDP
DHCP	67,68	TCP/UDP

✔ Presentation Layer 

Protocol	Transport Port Number	Trasport Protocol used
X.25	1998	TCP/UDP
Telnet	23	TCP/UDP
ICA
LPP

 

✔ Session Layer 

Protocol	Transport Port Number	Trasport Protocol used
SMPP	2775	TCP/UDP
RTCP	548	TCP/UDP
H.245		TCP/UDP
PPTP	1723	TCP/UDP
ZIP	1520	TCP/UDP
SDP		TCP/UDP
PAP		TCP/UDP

✔ Transport Layer 

Protocol	Important characteristic	PDU Name
TCP	Connection Oriented	Segment
UDP	Connetionless
SCTP	Connection Oriented
RUDP	Connection Oriented
UDP - Lite	Connetionless
Multipath TCP	Connection Oriented

 

✔ Network Layer 

Protocol	Important characteristic	PDU Name
ICMP	Error Reporting	Packet
IGMP	Multicast Group Membership Management
IPSEC	Secure IP network like VPN
RIP	Dynamic IP Routing, Hop count based routing. IGP
OSPF	Link state and link cost based routing
IPv4/IPv6	32 bit address, 128 bit address

✔ Data Link Layer 

Protocol	Services	PDU Name
HDLC	LLC - Logical Link Control Error control - ARQ, Flow control	Frame
LLDP	MAC - Medium Access Control CSMA/CD, LAN switching STP and SPB, MAC addressing, Store and forward, VLAN, QOS
Frame Relay	Encapsulation to frames
PPP	Frame sync
MPLS

✔ Physical Layer 

Technologies	PDU Name
OTN	Raw Bits
SDH
SONET