This layer req uests for a logical connection to be established on an end-user’s request. Any necessary log-on or password validation is also handled Responsible for terminating the connection. Provides services like dialogue discipline which can be full duplex or half duplex. Provide check-pointing mechanism such that if a failure of some sort occurs between checkpoints, all data can be retransmitted from the last checkpoint.
Transport and session layer Transport • Makes sure the message is received without error • Divides the message into packets • Controls the quality of service Session • Connection and disconnection • Binding • Interface between connections
Layer 6 – Presentation Layer • Translates the data format from sender to receiver in the various OSes that may be used • Presentation Layer concepts include: • character code conversion • data compression • data encryption • Redirectors work on this layer, such as mapped network drives that enable a computer to access fle shares on a remote computer
Layer 6 – Presentation Layer Presentation layer defnes the format in which the data is to be exchanged between the two communicating entities. Also handles data compression and data encryption (cryptography).
Layer 7 – Application Layer • Serves as a the window for users and application processes to access network services • Where message creation begins • End-user protocols such as FTP, SMTP, Telnet, and RAS work at this layer • NOTE : This layer is not the application itself, but the protocols that are initiated by this layer
Layer 7 – Application Layer Application layer interacts with application programs and is the highest level of OSI model. Application layer contains management functions to support distributed applications. Examples of application layer are applications such as fle transfer, electronic mail, remote login etc.
Layer 7 – Application Layer All applications and utilities that communicate with network fall in this layer. For examples Browsers :- Mozilla Firefox, Internet Explorer, Google Chrome etc Email clients: - Outlook Express, Mozilla Thunderbird etc. FTP clients :- Filezilla, sFTP, vsFTP SNMP (Simple Network Management Protocol) — Used to control the connected networking devices. FTP/TFTP (Trivial File Transfer Protocol) — Used to transfer the fles rapidly. DNS (Domain Naming System) — Used to translate the name with IP address and vice versa. DHCP (Dynamic Host Confguration Protocol) — Used to assign IP address and DNS information automatically to hosts. Telnet— used to connect remote devices. HTTP (Hypertext Transfer Protocol) — Used to browse web pages. SMTP (Simple Mail Transfer Protocol) — Used to sends email. POP3 (Post Ofce Protocol v.3) — Used to retrieves email.
Presentation and application layer Presentation • Encryption • Type conversions Application • Basic application protocol – HTTP – SMTP – FTP – IRC
OSI Model Reviewed Layer Protocols Device 7 – Application FTP, HTTP, POP3, SMTP Gateway 6 – Presentation Compression, Encryption N/A 5 – Session Logon/Logof N/A 4 – Transport TCP, UDP N/A 3 – Network IP, ICMP, ARP, RIP Routers 2 – Data Link 802.3, 803.5 NICs, Switches, Bridges, WAPs 1 – Physical 100BASE-T, 1000BASE- X Hubs, Patch Panels, RJ45 Jacks
- Fall '19
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