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Topic: Network layer

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In the News (Thu 25 Apr 19)

  Network layer - Wikipedia, the free encyclopedia
The network layer is level three of the seven level OSI model.
In essence, the network layer is responsible for end to end (source to destination) packet delivery, whereas the data link layer is responsible for node to node (hop to hop) packet delivery.
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.
en.wikipedia.org /wiki/Network_layer   (483 words)

 OSI model - Wikipedia, the free encyclopedia
Usually, the implementation of a protocol is layered in a similar way to the protocol design, with the possible exception of a 'fast path' where the most common transaction allowed by the system may be implemented as a single component encompassing aspects of several layers.
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.
A common joke is the 9 layer model, with layers 8 and 9 being the "financial" and "political" layers.
en.wikipedia.org /wiki/OSI_model   (1492 words)

 Network Layer   (Site not responding. Last check: 2007-11-06)
The network layer attempts to deliver packets from a node on one network segment to another node that may be on another network segment.
Network layer addresses consist of two parts: A network segment prefix which identifies the network segment and a node suffix, which identifies the node on the segment.
The network segment prefix is divided into 2 parts: The network number which is unique in the world and a subnet number with is assigned at the campus level.
punch.engr.wisc.edu /~orchard/net-tutorial/network.html   (321 words)

 RFC 941 - Addendum to the network service definition covering network layer addressing. International Organization for ...
RFC 941 April 1985 Network Layer Addressing SCOPE AND FIELD OF APPLICATION The scope of this Addendum is the definition of the abstract syntax and semantics of the Network Address.
RFC 941 April 1985 Network Layer Addressing 6.3 Authorities The uniqueness of identifiers within a domain or subdomain is ensured by an authority associated with that domain.
RFC 941 April 1985 Network Layer Addressing The second type of padding is necessary to ensure that a binary encoding of the IDI consists of an integral number of binary octets.
rfc.sunsite.dk /rfc/rfc941.html   (5841 words)

 Mobility Management is a Network Layer Function
By definition, routing is a network layer function and thus mobility management should also be a network layer function.
The ability to route packets toward their final destination is based on the fact that network layer addresses are typically composed of a network-identifying part and a host-identifying part.
The assignments of network layer addresses to hosts is based on the topology (state of connectivity) of the network.
www.leapforum.org /published/internetworkMobility/split/node22.html   (1006 words)

 O'Reilly Network -- The Scholar's Approach to the Internet
The purpose of the transport layer is to guarantee correctness of data before it is passed up the layers to the application.
The lower layers of the OSI model are responsible for the physical connectivity of the host and the routing of data in the network.
The bottom sections of the model -- network, datalink, and physical -- are sometimes referred to as the network layer, and provide delivery of data up to the transport layer, which in turn relays the information to the application layer.
www.oreillynet.com /pub/a/network/2001/02/09/net_2nd_lang.html   (1404 words)

 Network Protocol Levels   (Site not responding. Last check: 2007-11-06)
The layers are arranged here from the lower levels starting with the physical (hardware) to the higher levels.
Network - Corresponds to the network layer of the OSI model and includes the IP, ICMP, and IGMP protocols.
When starting with protocols that work at the upper layers of the network models, each set of data is wrapped inside the next lower layer protocol, similar to wrapping letters inside an envelope.
www.comptechdoc.org /independent/networking/guide/netstandards.html   (1781 words)

 RFC 2956 (rfc2956) - Overview of 1999 IAB Network Layer Workshop
The goal of the workshop was to understand the state of the network layer and its impact on continued growth and usage of the Internet.
The goal of the workshop was to discuss the current state of the Network Layer and the impact various currently deployed or future mechanisms and technologies might have on the continued growth and usage of the Internet.
Based on the discussion of these scenarios several trends and external influences were identified which could have a large impact on the status of the network layer, such as the deployment of wireless network technologies, mobile networked devices and special purpose IP devices.
www.faqs.org /rfcs/rfc2956.html   (4114 words)

 [No title]
Network Working Group D. Katz Request for Comments: 1377 cisco November 1992 The PPP OSI Network Layer Control Protocol (OSINLCP) Status of this Memo This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements.
Network Layer Protocol Identifier (NLPID) OSI Network Layer protocols can be discriminated according to the first octet in each Network Protocol Data Unit (NPDU, that is, packet), known as the Network Layer Protocol Identifier (NLPID), which is defined in ISO/TR 9577 [7].
The OSI Network Layer Control Protocol is exactly the same as the Link Control Protocol [1] with the following exceptions: Frame Modifications The packet may utilize any modifications to the basic frame format which have been negotiated during the Link Establishment phase.
www.ietf.org /rfc/rfc1377.txt   (2717 words)

 Webopedia: The 7 Layers of the OSI Model
Control is passed from one layer to the next, starting at the application layer in one station, proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.
This layer provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control.
This layer conveys the bit stream - electrical impulse, light or radio signal -- through the network at the electrical and mechanical level.
www.webopedia.com /quick_ref/OSI_Layers.asp   (426 words)

 Network Layer: Introduction and Service Models
The role of the network layer in a sending host is to begin the packet on its journey to the the receiving host.
The network layer will then typically inform the end system on the other side of the network of the call termination, and update the data structures in the packet switches on the source-to-destination path to indicate that the connection no longer exists.
Telephone networks, by necessity, had their "complexity' within the network, since they were connecting "dumb" end-system devices such as a rotary telephone (For those too young to know, a rotary phone is a non-digital telephone with no buttons - only a dial).
gaia.cs.umass.edu /kurose/network/service/service.htm   (2729 words)

 O'Reilly Network -- Exploring the Transport Layer
The lowest layer, Layer 1, is the link layer which is identical to the OSI datalink layer.
Layer 3 is the transport layer and Layer 4 is the application layer.
Once data is handed off from the application layer to the transport layer, using TCP as the transport protocol, the application also hands off flow control to the lower layer.
www.oreillynet.com /pub/a/network/2001/07/13/net_2nd_lang.html   (550 words)

 The Network Layer   (Site not responding. Last check: 2007-11-06)
The network layer is concerned with controlling the operation of the subnet.
It is up to the network layer to overcome all these problems to allow heterogeneous networks to be interconnected.
In broadcast networks, the routing problem is simple, so the network layer is often thin or even nonexistent.
www2.rad.com /networks/1994/osi/network.htm   (261 words)

 Network Layers
Network layer may have to break large datagrams, larger than MTU, into smaller packets and host receiving the packet will have to reassemble the fragmented datagram.
The leading 1-3 bytes of the IP identifies the network and the remaining bytes identifies the host on that network.
The network portion of the IP is assigned by InterNIC Registration Services, under the contract to the National Science Foundation, and the host portion of the IP is assigned by the local network administrators, locally by noc@indiana.edu.
www.ussg.iu.edu /usail/network/nfs/layers.html   (670 words)

 Design issues for the network layer   (Site not responding. Last check: 2007-11-06)
The transport layer (that is the host computer) should be shielded from the number, type and different topologies of the subnets he uses.
Proponents of this arguement are quick to point out that the standard of our networks has increased greatly in the past years, that packets of information rarely ever do get lost, so much of the correction facilities in the network layer are redundant and serve only to complicate the layer and slow down transfer.
However, at the time of defining the network layer, the controversy between the two camps was (and still is) unresolved, and so instead of deciding on one service, the ISO allowed both.
ntrg.cs.tcd.ie /undergrad/4ba2/network/design.html   (812 words)

 [No title]
Network Working Group O. Jacobsen Request for Comments: 1208 D. Lynch Interop, Inc. March 1991 A Glossary of Networking Terms Status of this Memo This RFC is a glossary adapted from "The INTEROP Pocket Glossary of Networking Terms" distributed at Interop '90.
Data Link Layer: The OSI layer that is responsible for data transfer across a single physical connection, or series of bridged connections, between two Network entities.
Network Layer: The OSI layer that is responsible for routing, switching, and subnetwork access across the entire OSI environment.
www.ietf.org /rfc/rfc1208.txt   (4549 words)

 Network protocols: Network Layer
The high-level IP-based networking software in a given station is aware of its own 32-bit IP address and can read the 48-bit Ethernet address of its network interface, but it doesn't know what the Ethernet addresses of other stations on the network may be.
A host is essentially anything on the network that is capable of receiving and transmitting IP packets on the network, such as a workstation, server or a router.
The network number must be the same for all nodes on a particular physical network segment.
www.geocities.com /dinbbil30/cor6.html   (3986 words)

 Network Encyclopedia Article @ NaturalResearch.org   (Site not responding. Last check: 2007-11-06)
Transport network, facilities on which people and goods move.
Transportation network (graph theory), representations of transport networks for analysis
Network theory, the applied mathematics counterpart of graph theory
www.naturalresearch.org /encyclopedia/Network   (231 words)

 The Network Layer   (Site not responding. Last check: 2007-11-06)
The basic service of the network layer is to provide the transparent transfer of data between transport-entities.
The Network layer uniquely identifies each end open system by means of a network address this may be independent of the addressing used by the lower layers.
The flow control at this level is different from that at the lower levels in that a transport entity may cause the network service to stop transferring NSDUs to it but this flow control may or may not be propagated back to the other endpoint.
www.scit.wlv.ac.uk /~jphb/comms/std.osirm3.html   (389 words)

 Network Layers
The next morning at the standards committee meeting, the group passed around the cocktail napkin and generally agreed that that they had discovered something fundamental the previous night while they were drunk.
If you monitor a network and watch the pattern of packets emitted by a computer, you'll immediately understand the relationship between link-layer protocols and ``Sneezy''.
Programmers who design network applications are incredibly grumpy -- they complain about the efficiency of other layers, the fundamental abstractions of the network, the long hours, the difficulty of debugging, and the API they are forced to use.
www.cs.purdue.edu /homes/dec/essay.network.layers.html   (571 words)

 Network Protocol Categories
Considering the many protocols, message types, levels, and services that TCP/IP networking supports, I believe it would be very helpful to categorize the various protocols that support TCP/IP networking and define their respective contribution to the operation of networking.
The link layer is the hardware layer that provides ability to send messages between multiple locations.
There are exceptions to my categorizations that don't fit into the normal layering scheme, such as IGMP is normally part of the link layer, but I have tried to list these categorizations according to network functions and their relative importance to the operation of the network.
www.comptechdoc.org /independent/networking/guide/netcategories.html   (1009 words)

 Transmission Control Protocol article - Transmission Control Protocol transport layer IETF TCP/IP network layer ...   (Site not responding. Last check: 2007-11-06)
This is why TCP exists: Applications send streams of 8-bit bytes to TCP for delivery onto the network and TCP delineates the byte stream into appropriately sized segments, usually defined by a maximum transmission unit (MTU) size used by the data link layer below.
The weak checksum is partially compensated for by the common use of a CRC or better integrity check at layer 2, below both TCP and IP, such as is used in PPP or the Ethernet frame.
Acknowlegements for data sent, or lack of acknowlegements, are used by senders to implicity interpret network conditions between the TCP sender and receiver.
www.what-means.com /encyclopedia/Transmission_Control_Protocol   (1434 words)

 The Network Layer   (Site not responding. Last check: 2007-11-06)
The Network layer has the responsibility for dealing with routing packets to the correct destination.
The network layer provides both packet oriented and connection oriented services for the transport layer.
The services are provided by the network layer primitives.
www.sju.edu /~jhodgson/netw/network.html   (200 words)

 O'Reilly Network -- Layer 3 Switching -- Introducing the Router
Her background will be instrumental in helping them decide if they can continue to grow with a layer 2 switching architecture, of if they need to add routers to their topology.
A layer 2 switch communicates using frames on the wire at layer 1.
In this case, Host B is on a token ring network segment directly connected to the router.
www.oreillynet.com /pub/a/network/2001/04/13/net_2nd_lang.html   (629 words)

 Define layer 3 - a Whatis.com definition
Layer 3 refers to the Network layer of the commonly-referenced multilayered communication model, Open Systems Interconnection (OSI).
The Network layer is concerned with knowing the address of the neighboring nodes in the network, selecting routes and quality of service, and recognizing and forwarding to the Transport layer incoming messages for local host domains.
is a layer 3 device, although some newer switches also perform layer 3 functions.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214604,00.html   (149 words)

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