OSI Model Flashcards
OSI Model: Physical
Governs the layout of cables and devices, such as
repeaters and hubs
OSI Model: Data Link
Provides MAC* addresses to uniquely identify network
nodes and a means for data to be sent over the Physical
layer in the form of packets. Bridges and switches are
Layer 2 devices.
OSI Model: Network
Handles routing of data across network segments.
OSI Model: Transport
Provides for reliable delivery of packets
OSI Model: Session
Establishes sessions between network applications.
OSI Model: Presentation
Converts data so that systems that use different data
formats can exchange information.
OSI Model: Application
Allows applications to request network services.
TCP/IP Model:Network layer
The Network layer is where data is addressed, packaged, and routed among
networks.
TCP/IP Model: Transport layer
The Transport layer is where sessions are established and data packets are
exchanged between hosts
TCP/IP Model: Application layer
The Application layer of the TCP/IP model corresponds to the Session,
Presentation, and Application layers of the OSI reference model.
TCP/IP Model: Network Interface layer
It corresponds to the OSI Physical and Data Link layers. You can use many
different TCP/IP protocols at the Network Interface layer, including Ethernet
and token ring for LANs and protocols such as X.25, Frame Relay, and ATM
for wide area networks (WANs).
(IP):
Internet Protocol A routable protocol that uses IP addresses to
deliver packets to network devices. IP is an intentionally unreliable protocol,
so it doesn’t guarantee delivery of information.
(ARP):
Address Resolution Protocol Resolves IP addresses to hardware
Media Access Control (MAC) addresses, which uniquely identify hardware
devices.
(ICMP):
Internet Control Message Protocol Sends and receives diagnostic
messages. ICMP is the basis of the ubiquitous ping command.
(IGMP):
Internet Group Management Protocol Used to multicast messages
to multiple IP addresses at once.
(TCP):
Transmission Control Protocol Provides reliable connectionoriented
transmission between two hosts. TCP establishes a session
between hosts, and then ensures delivery of packets between the hosts.
(UDP):
User Datagram Protocol Provides connectionless, unreliable, oneto‐
one or one‐to‐many delivery.
(HTTP):
HyperText Transfer Protocol (HTTP): The core protocol of the World
Wide Web.
(FTP):
File Transfer Protocol (FTP): A protocol that enables a client to send and
receive complete files from a server.
Telnet:
The protocol that lets you connect to another computer on the
Internet in a terminal emulation mode.
(SMTP):
Simple Mail Transfer Protocol (SMTP): One of several key protocols that
are used to provide email services.
(DNS):
Domain Name System (DNS): The protocol that allows you to refer to
other host computers by using names rather than numbers.
