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Topic: Layer 2

Related Topics

OSI model

Data link layer

Application layer

Physical layer

Session layer

Aloha protocol

Asynchronous Transfer Mode

HDLC

MAC address

SS7

Ethernet

Quality of service

Magic number (programming)

UMTS

Synchronization

	OSI model - Wikipedia, the free encyclopedia
		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.
		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.
		A common joke is the 9 layer model, with layers 8 and 9 being the "financial" and "political" layers.
	en.wikipedia.org /wiki/Layer_2 (1225 words)

	Data link layer - Wikipedia, the free encyclopedia
		The data link layer is layer two of the seven-layer OSI model.
		It responds to service requests from the network layer and issues service requests to the physical layer.
		The data link layer is the layer of the model which ensures that data is transferred correctly between adjacent network nodes in a wide area network.
	en.wikipedia.org /wiki/Data_link_layer (467 words)

	The OSI Model, data link layer, 7 layer model
		This layer is resonsible for the ordering and reassembly of packets that may have been broken up to travel across certain media.
		Once the data from layer 2 has been received, layer 3 examines the destination address and if it is the address of its own end station, it passes the data after the layer 3 header to layer 4.
		The MAC layer concerns itself with the access control method and determines how use of the physical transmission is controlled and provides the token ring protocols that define how a token ring operates.
	www.rhyshaden.com /osi.htm (762 words)

	CCNA Study Notes - OSI - Data Link Layer
		Error notification alerts upper layer protocols that a transmission error has occurred, and the sequencing of data frames reorders frames that are transmitted out of sequence.
		This is left for the upper layers to deal with, primarily on the Transport layer.
		Bridges operate at Layer 2 and usually do not reduce broadcasts because a bridge forwards broadcast packets to all of its ports except the port on which the broadcast packet arrived.
	defoenet.com /ccna/osi_l2.html (1380 words)

	Informit Safari Tech Books Online - Layer 2 VPN Architectures
		Layer 2 VPN Architectures introduces readers to Layer 2 Virtual Private Network (VPN) concepts, and describes Layer 2 VPN techniques via introductory case studies and comprehensive design scenarios.
		The structure of this book is focused on first introducing the reader to Layer 2 VPN benefits and implementation requirements and comparing them to those of Layer 3 based VPNs, such as MPLS, then progressively covering each currently available solution in greater detail.
		Layer 2 VPN Architectures is a comprehensive guide to consolidating network infrastructures and extending VPN services.
	safari.informit.com /1587051680 (1167 words)

	Layer 2 VPNs allow scalable meshing (Site not responding. Last check: 2007-11-07)
		At each participating provider edge device, the Layer 2 protocol header is stripped, and its IP payload is encapsulated in the VPN label.
		In a traditional Layer 2 network, a full mesh requires N x (N-1)/2 PVCs, where "N" is the number of customer sites.
		Layer 3 MPLS VPNs are generally deployed as managed network services in which the service provider assumes control of customer IP addressing assignments.
	www.networkworld.com /news/tech/2002/0708tech.html (870 words)

	layer 2 - a Whatis.com definition (Site not responding. Last check: 2007-11-07)
		Layer 2 refers to the Data Link layer of the commonly-referenced multilayered communication model, Open Systems Interconnection (OSI).
		In a network, the switch is a device that redirects data messages at the layer 2 level, using the destination Media Access Control (MAC) address to determine where to direct the message.
		The Data Link layer ensures that an initial connection has been set up, divides output data into data frames, and handles the acknowledgements from a receiver that the data arrived successfully.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci214603,00.html (191 words)

	Overview of MPEG-2 AAC Audio Coding
		Layer 3 (popularly known as MP3) implements a unique combination of methods to attain high compression ratios while preserving audio quality.
		However, in the United States the trademark, MUSICAM, is protected by one of the licensees of Layer 2.
		The Layer 2 implementation in Zephyr Xstream meets the MPEG audio world-wide coding standard.
	www.telos-systems.com /techtalk/mpeg (1044 words)

	AnimeOnDVD.com >> Disc Reviews >> Angelic Layer Vol. #2
		Although Misaki has just started playing the amazing fighting game Angelic Layer, she is already competing against the best in Tokyo for a chance to fight in the national tournament in Kanto.
		With four more episodes, Angelic Layer proves to be one of the faster flowing series I’ve seen recently, causing the disc to be over far earlier than you expect it to be.
		The episodes spend a good majority of the time actually in fight mode with the Angelic Layer contest itself, but enough time is spent outside of it with moments of character development and movement.
	www.animeondvd.com /reviews2/disc_reviews/2563.php (1307 words)

	PointToPoint - SeattleWireless
		Layer 2 is defined as a Data Link layer.
		Using 802.11b standards based equipment, The only Layer 2 routing that we have available to us is BSS.
		They are using Layer 3 (IP)routers and are in BSS mode.
	www.seattlewireless.net /index.cgi/PointToPoint (3993 words)

	Layer 2
		NetBEUI is a transport mechanism, Combines transport (4), network (3) and some data link layers (2).
		No IP Address is carried, all layer two MAC format.
		Keeping the routing function at the MAC or Level 2 layer allows the higher layer protocols to execute their tasks more efficiently, and also allows the LAN to be expanded without the knowledge of the higher layer protocols.
	www.timhogan.us /Layer2.html (693 words)

	2.3.1 D-Channel Layer 2 (Site not responding. Last check: 2007-11-07)
		The TEI is an ``address'' for a device on the S0 bus which is dynamically assigned, verified and - under certain circumstances - removed without user interaction, more, the user doesn't notice the TEI management procedures at all.
		More generally, layer 2 is responsible for providing an error free link for the signaling procedures specified in layer 3 and as such it deals mostly with error detection, correction and recovery.
		The layer 2 HDLC frames are constructed out of layer 1 frames like this:
	people.freebsd.org /~hm/i4b-095/node11.html (129 words)

	ISDN Tutorial: Protocols - Layer 2
		The ISDN Data Link Layer is specified by the ITU Q-series documents Q.920 through Q.923.
		All of the signaling on the D channel is defined in the Q.921 spec.
		The Layer 2 establishment process is very similar to the X.25 LAP-B setup, if you are familiar with it.
	www.ralphb.net /ISDN/proto_l2.html (369 words)

	Amazon.com: Books: Angelic Layer (Angelic Layer, 2) (Site not responding. Last check: 2007-11-07)
		The Angelic Layer tournament in Kanto continues, presenting Misaki Suzuhara with a series of challenges that test both her ability to control her angel, and her love for her angel.
		This Angelic layers is one of the funniest and one of the most action-packed Angelic layers.
		She loved seeing how the smaller angel was able to defeat the larger angel, cuz she's not exactly what people would call big for her age.
	www.amazon.com /exec/obidos/tg/detail/-/1591820030?v=glance (1157 words)

	Netgear 24-Port Layer 2 Managed Gigabit Switch (GSM7224NA ) - Networking
		This next-generation, high-speed switch delivers maximum throughput where you need it - to high-performance workgroups at the edge of the network, or as a backbone for 10/100 switches and Gigabit servers in demanding small networks.
		Layer 2 management functionality delivers reliability, control, and availability.
		Optimize bandwidth, security, and control with full Layer 2 management capabilities - extensive VLAN support, resiliency, traffic prioritization, port trunking, port mirroring, RADIUS, SNMP, and DHCP features, as well as broadcast storm protection.
	www.superwarehouse.com /p.cfm?p=371755&CMP=KA18698 (332 words)

	Data-Link Layer - 2 (Site not responding. Last check: 2007-11-07)
		Data has to be free of all errors to be useful.
		Builds on the transmission facility provided by the physical layer to transform it into a link that appears to the network layer above to be free of transmission errors.
		There are a number of ways of trying to remove the errors introduced by the physical layer.
	www.eeng.dcu.ie /~murphyj/tc2/dc2000/tsld018.htm (72 words)

	Cisco - Layer 2 Tunnel Protocol
		L2TP is one of the key building blocks for virtual private networks in the dial access space and is endorsed by Cisco and other internetworking industry leaders.
		It is possible to configure the LACs to perform round robin load sharing across 2 or more LNSs.
		A virtual access interface is brought up dynamically when an incoming PPP session is forwarded across the L2TP tunnel.
	www.cisco.com /warp/public/cc/pd/iosw/tech/l2pro_tc.htm (3363 words)

	Layer 2 Virtual Private Networks (l2vpn) Charter
		Framework for Layer 2 Virtual Private Networks (L2VPNs) (98656 bytes)
		Service Requirements for Layer 2 Provider Provisioned Virtual Private Networks (67396 bytes)
		ARP Mediation for IP Interworking of Layer 2 VPN (39804 bytes)
	www.ietf.org /html.charters/l2vpn-charter.html (433 words)

	L2TP (Layer 2 Tunneling Protocol) (Linktionary term)
		PPTP (point-to-point tunneling protocol) is a Microsoft-developed protocol that provides virtual dial-up services similar to L2TP.
		L2TP was derived from PPTP features and features of an earlier Cisco protocol called L2F (Layer 2 Forwarding).
		As mentioned, RFC 2888 describes how L2TP and IPSec can be used together.
	www.linktionary.com /l/l2tp.html (1029 words)

	Amazon.com: Books: Layer 2 VPN Architectures (Networking Technology) (Site not responding. Last check: 2007-11-07)
		Amazon.com: Books: Layer 2 VPN Architectures (Networking Technology)
		He is the principle designer and developer for Cisco Layer 2 VPN products including AToM and VPLS.
		2 of 2 people found the following review helpful:
	www.amazon.com /exec/obidos/tg/detail/-/1587051680?v=glance (1295 words)

	eCost — Computers and Electronics for Home and Business — Plasma TV iPODS Laptop MP3 Player
		Web Smart 24-Port 10 100 Switch - 2 Combo Gigabit Copper SFP Ports
		DGS-3312SR 4-Port Combo SFT Gigabit Switch Managed Layer 3 2 Slots
		FSM750S 48 port 10 100 + 2 10 100 1000 + 2 Stacking Ports Managed Stackable Switch
	www.ecost.com /ecost/shop/detail.asp?dpno=284859 (209 words)

	ASUS GIGAX1024i 10/100Mbps Layer 2 Smart Switch - Retail at Newegg.com (Site not responding. Last check: 2007-11-07)
		ASUS GIGAX1024i 10/100Mbps Layer 2 Smart Switch - Retail at Newegg.com
		ASUS GIGAX1024i 10/100Mbps Layer 2 Smart Switch - Retail
		Extended warranty is not available for items combined with a free gift.
	www.newegg.com /Product/Product.asp?Item=N82E16833320405 (321 words)

	DVD Empire - Item - Angelic Layer 2: On a Wing and a Player / DVD-Video (Site not responding. Last check: 2007-11-07)
		Product is Guaranteed to Ship the next Empire Business Day.
		Be the first customer to comment on this Title.
		Misaki meets her match when she must fight against her friend, Angelic Layer prodigy Hatoko, the
	www.dvdempire.com /Exec/v4_item.asp?item_id=552047&partner_id=10007512 (108 words)

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