Saturday, July 12, 2008
Sunday, December 9, 2007
Hahaha di ako na capture ni ms. antonio -it's all about network topology men!
CISCO MODULE 2 ONLINE LECTURE!
lan-local area network
man-metropolitan area network
wan-wide area network
networking topology!
bandwidth-is defined as the amount of information that can flow through a network connection in a given period of time
-finite
-not free
-important factor that is used to analyze neetwork performance, design new
-continues to grow
today we should report about the different types of network topology so that we can define each uses!
LAN AND WAN!
LAN- -operate within limited geographic area
-allow multi-access to high-bandwidth media
-control the network privately under local administration
-provide full-time connectivity to local services
-connect physically adjacent devices
Using:
-Hub
-Router
-Ethernet Switch
-Bridge
-Repeater
LAN- limited/small
examples:
rm to rm
bldg to bldg
pc to pc
Sneakernet- is a term used to describe the transfer of electronic information, especially computer files, by physically carrying removable media such as magnetic tape, floppy disks, compact discs, USB flash drives or external drives from one computer to another.
Sneaker refers to the shoes of the person carrying the media. This is usually in lieu of transferring the information over a computer network.
WAN-LARGE topographical area
OSI model
From Wikipedia, the free encyclopedia
(Redirected from Osi model)
Jump to: navigation, search
OSI Model
7 Application layer
6 Presentation layer
5 Session layer
4 Transport layer
3 Network layer
2 Data link layer
* LLC sublayer
* MAC sublayer
1 Physical layer
The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. It is also called the OSI seven layer model. The layers, described below, are, from top to bottom, Application, Presentation, Session, Transport, Network, Data Link, and Physical. A layer is a collection of related functions that provides services to the layer above it and receives service from the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that make up the contents of the path.
Even though newer IETF and IEEE protocols, and indeed OSI protocol work subsequent to the publication of the original architectural standards that have largely superseded it, the OSI model is an excellent place to begin the study of network architecture. Not understanding that the pure seven-layer model is more historic than current, many beginners make the mistake of trying to fit every protocol they study into one of the seven basic layers. This is not always easy to do as many of the protocols in use on the Internet today were designed as part of the TCP/IP model, and may not fit cleanly into the OSI model.
OSI-networking model
ISO-
Protocols enable an entity in one host to interact with a corresponding entity at the same layer in a remote host. Service definitions abstractly describe the functionality provided to an (N)-layer by an (N-1) layer, where N is one of the seven layers inside the local host.
7 LAYERS!
Layer 1: Physical layer
Main article: Physical layer
The Physical layer defines all the electrical and physical specifications for devices. In particular, it defines the relationship between a device and a physical medium. This includes the layout of pins, voltages, cable specifications, Hubs, repeaters, network adapters, Host Bus Adapters (HBAs used in Storage Area Networks) and more.
Layer 2: Data Link layer
Main article: Data link layer
The Data Link layer provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer. Originally, this layer was intended for point-to-point and point-to-multipoint media, characteristic of wide area media in the telephone system.
Layer 3: Network layer
Main article: Network layer
The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks while maintaining the quality of service requested by the Transport layer. The Network layer performs network routing functions, and might also perform fragmentation and reassembly, and report delivery errors. Routers operate at this layer—sending data throughout the extended network and making the Internet possible. This is a logical addressing scheme – values are chosen by the network engineer. The addressing scheme is hierarchical.
Layer 4: Transport layer
Main article: Transport layer
The Transport layer provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. The transport layer controls the reliability of a given link through flow control, segmentation/desegmentation, and error control. Some protocols are state and connection oriented.
Layer 5: Session layer
Main article: Session layer
The Session layer controls the dialogues/connections (sessions) between computers. It establishes, manages and terminates the connections between the local and remote application. It provides for full-duplex, half-duplex, or simplex operation, and establishes checkpointing, adjournment, termination, and restart procedures.
Layer 6: Presentation layer
Main article: Presentation layer
The Presentation layer establishes a context between application layer entities, in which the higher-layer entities can use different syntax and semantics, as long as the Presentation Service understands both and the mapping between them. The presentation service data units are then encapsulated into Session Protocol Data Units, and moved down the stack.
Layer 7: Application layer
Main article: Application layer
The application layer interfaces directly to and performs common application services for the application processes; it also issues requests to the presentation layer. Note carefully that this layer provides services to user-defined application processes, and not to the end user. For example, it defines a file transfer protocol, but the end user must go through an application process to invoke file transfer.
lan-local area network
man-metropolitan area network
wan-wide area network
networking topology!
bandwidth-is defined as the amount of information that can flow through a network connection in a given period of time
-finite
-not free
-important factor that is used to analyze neetwork performance, design new
-continues to grow
today we should report about the different types of network topology so that we can define each uses!
LAN AND WAN!
LAN- -operate within limited geographic area
-allow multi-access to high-bandwidth media
-control the network privately under local administration
-provide full-time connectivity to local services
-connect physically adjacent devices
Using:
-Hub
-Router
-Ethernet Switch
-Bridge
-Repeater
LAN- limited/small
examples:
rm to rm
bldg to bldg
pc to pc
Sneakernet- is a term used to describe the transfer of electronic information, especially computer files, by physically carrying removable media such as magnetic tape, floppy disks, compact discs, USB flash drives or external drives from one computer to another.
Sneaker refers to the shoes of the person carrying the media. This is usually in lieu of transferring the information over a computer network.
WAN-LARGE topographical area
OSI model
From Wikipedia, the free encyclopedia
(Redirected from Osi model)
Jump to: navigation, search
OSI Model
7 Application layer
6 Presentation layer
5 Session layer
4 Transport layer
3 Network layer
2 Data link layer
* LLC sublayer
* MAC sublayer
1 Physical layer
The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. It is also called the OSI seven layer model. The layers, described below, are, from top to bottom, Application, Presentation, Session, Transport, Network, Data Link, and Physical. A layer is a collection of related functions that provides services to the layer above it and receives service from the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that make up the contents of the path.
Even though newer IETF and IEEE protocols, and indeed OSI protocol work subsequent to the publication of the original architectural standards that have largely superseded it, the OSI model is an excellent place to begin the study of network architecture. Not understanding that the pure seven-layer model is more historic than current, many beginners make the mistake of trying to fit every protocol they study into one of the seven basic layers. This is not always easy to do as many of the protocols in use on the Internet today were designed as part of the TCP/IP model, and may not fit cleanly into the OSI model.
OSI-networking model
ISO-
Protocols enable an entity in one host to interact with a corresponding entity at the same layer in a remote host. Service definitions abstractly describe the functionality provided to an (N)-layer by an (N-1) layer, where N is one of the seven layers inside the local host.
7 LAYERS!
Layer 1: Physical layer
Main article: Physical layer
The Physical layer defines all the electrical and physical specifications for devices. In particular, it defines the relationship between a device and a physical medium. This includes the layout of pins, voltages, cable specifications, Hubs, repeaters, network adapters, Host Bus Adapters (HBAs used in Storage Area Networks) and more.
Layer 2: Data Link layer
Main article: Data link layer
The Data Link layer provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer. Originally, this layer was intended for point-to-point and point-to-multipoint media, characteristic of wide area media in the telephone system.
Layer 3: Network layer
Main article: Network layer
The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks while maintaining the quality of service requested by the Transport layer. The Network layer performs network routing functions, and might also perform fragmentation and reassembly, and report delivery errors. Routers operate at this layer—sending data throughout the extended network and making the Internet possible. This is a logical addressing scheme – values are chosen by the network engineer. The addressing scheme is hierarchical.
Layer 4: Transport layer
Main article: Transport layer
The Transport layer provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. The transport layer controls the reliability of a given link through flow control, segmentation/desegmentation, and error control. Some protocols are state and connection oriented.
Layer 5: Session layer
Main article: Session layer
The Session layer controls the dialogues/connections (sessions) between computers. It establishes, manages and terminates the connections between the local and remote application. It provides for full-duplex, half-duplex, or simplex operation, and establishes checkpointing, adjournment, termination, and restart procedures.
Layer 6: Presentation layer
Main article: Presentation layer
The Presentation layer establishes a context between application layer entities, in which the higher-layer entities can use different syntax and semantics, as long as the Presentation Service understands both and the mapping between them. The presentation service data units are then encapsulated into Session Protocol Data Units, and moved down the stack.
Layer 7: Application layer
Main article: Application layer
The application layer interfaces directly to and performs common application services for the application processes; it also issues requests to the presentation layer. Note carefully that this layer provides services to user-defined application processes, and not to the end user. For example, it defines a file transfer protocol, but the end user must go through an application process to invoke file transfer.
Tuesday, December 4, 2007
ang panget ni isabelle laureta?! duh!
oo panget siya pwamis duh! shete kainis siya wah !
this is warrrrrrrr!!!
Saturday, April 21, 2007
music haven ! shockz music videos lng toh mga tol
yan try nyo iplay yan maganda yan the best yan promise favorite ng mga american idol contestants yan
sh3t maganda ang music video na toh tlga promise
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