Sublayer of the Open Systems Interconnection model
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OSI model by layer
7. Application layer
NNTP
SIP
SSI
DNS
FTP
Gopher
HTTP (HTTP/3)
NFS
NTP
SMPP
SSH
SMTP
SNMP
Telnet
DHCP
NETCONF
more....
6. Presentation layer
MIME
XDR
ASN.1
ASCII
TLS
PGP
5. Session layer
Named pipe
NetBIOS
SAP
PPTP
RTP
SOCKS
X.225[1]
4. Transport layer
TCP
UDP
SCTP
DCCP
QUIC
SPX
3. Network layer
IP
IPv4
IPv6
ICMP (ICMPv6)
IPsec
IGMP
IPX
IS-IS
AppleTalk
X.25
PLP
2. Data link layer
ATM
ARP
SDLC
HDLC
CSLIP
SLIP
GFP
PLIP
IEEE 802.2
LLC
MAC
L2TP
IEEE 802.3
Frame Relay
ITU-T G.hn DLL
PPP
X.25 LAPB
Q.922 LAPF
IEEE 802.11
1. Physical layer
RS-232
RS-449
ITU-T V-Series
I.430
I.431
PDH
SONET/SDH
PON
OTN
DSL
IEEE 802.3
IEEE 802.11
IEEE 802.15
IEEE 802.16
IEEE 1394
ITU-T G.hn PHY
USB
Bluetooth
v
t
e
In the IEEE 802 reference model of computer networking, the logical link control (LLC) data communication protocol layer is the upper sublayer of the data link layer (layer 2) of the seven-layer OSI model. The LLC sublayer acts as an interface between the medium access control (MAC) sublayer and the network layer.
The LLC sublayer provides multiplexing mechanisms that make it possible for several network protocols (e.g. IP, IPX and DECnet) to coexist within a multipoint network and to be transported over the same network medium. It can also provide flow control and automatic repeat request (ARQ) error management mechanisms.
^"X.225 : Information technology – Open Systems Interconnection – Connection-oriented Session protocol: Protocol specification". Archived from the original on 1 February 2021. Retrieved 10 March 2023.
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