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- Get real-world examples for applying network troubleshooting methodologies
- A few weeks ago, David Davis wrote an article about choosing a network troubleshooting methodology and introduced you to three approaches to network troubleshooting. This week, he revisits those approaches and offers up some real-world examples for applying them to your network. A few weeks ago, I wrote an...
- Tags: NETWORKING, Network technology, David Davis CCIE, MCSE+I, SCSA, Layer 1, bottom-up approach, Ethernet, network, Ethernet cable, OSI, Cisco Routers and Management Newsletter, DNS, PC, IP, IP Address, Subnet, Listing B, David Davis, Listing C, Default Gateway, Listing D
- Technical articles 2005-11-17
Additional Resources
- Layer 3 Switching
- This document is a map through the jungle of internetworking infrastructure, particularly focusing on how Layer 2 switching and Layer 3 routing have combined to form the powerful Layer 3 switching architecture. The document analyzes Layer 3 switching from both functional as well as an operational perspective, helping...
- Tags: Layer 3
- White papers 1998-05-01
- Multi-Layer Switching Demystified
- Multi-layer switching can be a confusing concept for students taking Cisco courses, and is only complicated further by more new terms arising, such as layer-3 and layer-4 switching. KnowledgeNet Instructor Jeremy Cioara employs concrete analogies to fully explain the concept of Cisco multi-layer switching in this article. "What is...
- Tags: KnowledgeNet, Cisco Systems Inc., KnowledgeNet Instructor Jeremy Cioara
- White papers 2001-08-01
- Layer 3 Switching: An Introduction
- This paper is a map through the jungle of internetworking infrastructure, particularly focusing on how Layer 2 switching and Layer 3 routing have combined to form the powerful Layer 3 switching architecture. The paper analyzes Layer 3 switching from both a functional and an operational perspective, helping the reader make...
- Tags: Layer 3
- White papers 1998-05-01
- OSI Layer-2 Encryption: Security goes one layer deeper
- Ethernet Layer 2 EncryptionI find it hard to believe this article firstly has no posts, and secondly doesn't recognise Senetas. Senetas is a pure Layer 2 vendor, who provides Layer 2 encryption hardware to SafeNet, nCipher and Thales.Senetas has Layer 2 encryptors for ATM, Sonet/SDH and Ethernet, ans all...
- Tags: Network technology, NETWORKING, OSI, security, andrew.younger@..., Senetas, Ethernet, Layer 2
- Discussion threads 2007-09-13
- MPLS VPNs: Layer 2 or Layer 3? Understanding the Choice
- Since there's been data networking, there's been a debate between switched and routed architectures - stated in OSI terms, between performing functions at Layer 3 or Layer 2. Today, we see it again surfacing as network architects consider the design of Virtual Private Networks VPNs that take advantage of Multi-Protocol...
- Tags: MPLS VPN, Layer 2, Layer 3, MPLS, VPNs, Networking, Network Security, Telecommunications
- White papers 2002-07-05
- Implementing Network Management on ATM Interfaces
- This paper provides a single reference on how to gather network management data on an ATM interface through the use of Simple Network Management Protocol SNMP. It focuses specifically on Cisco router ATM interfaces. ATM comprises a three-layer stack: an ATM Adaptation Layer AAL, an ATM layer, and a physical...
- Tags: Network, Network Management, ATM, Network Technology, Networking
- White papers 2005-10-19
- Providing Multi-Layer Security Support for Wireless Communications Across Multiple Trusted Domains
- Recently many link layer security protocols have been developed and deployed to protect the wireless communications in local area networks. However, cryptanalysis has revealed lots of insecurities and vulnerabilities of the link layer protocols. This paper studies a multi-layer alternative. Compared to a link layer approach, the multi-layer architecture provides...
- Tags: Wireless Communication, Domain, Wi-Fi, Wireless, Security
- White papers
- TCP Over CDMA2000 Networks: A Cross-Layer Measurement Study
- Modern cellular channels in 3G networks incorporate sophisticated power control and dynamic rate adaptation which can have a significant impact on adaptive transport layer protocols, such as TCP. Though there exists studies that have evaluated the performance of TCP over such networks, they are based solely on observations at the...
- Tags: Network, TCP, Springer Science+Business Media, Tcp/Ip, Networking
- White papers 2007-02-09
- My Network and Layer 3 Switching and VLANS
- Please help me understand a couple of things about my network, layer 3 switching, and VLANS.. I'm confused as hell about this stuff for some reason, I usually grasp such concepts so it's frustrating. We had a network which was entirely Layer 2 in nature, but then one switch...
- Tags: LANs, NETWORKING, nate@..., network, Layer 3, VLAN, server
- Discussion threads 2007-04-14
- Oracle Developer Day: The Services Layer With EJB 3.0
- This webcast explains about various technology options for constructing the backend Services layer and the new EJB 3.0 specification as an option for simplified persistence and business logic layer.
- Tags: Oracle Corp., Oracle Developer, EJB, J2Ee, Application Servers, Middleware, Enterprise Software, Software Development, Software/Web Development, Software
- Webcasts
- Network layer 3
- What is the need of a Network layer 3 in a broadcast network?um...functionality?without the IP part of layer 3, how can you send anything to an address, let alone all addresses?I assumethis is for a report. I can give you a starting point. When a packet is recieved by a...
- Tags: Routers & switches, Network technology, NETWORKING, daddybiggy@...
- Discussion threads 2007-07-09
- OSI Layers
- I am having trouble finding out in which OSI Layer does the ultimate sender and receiver of data make contact?Hi,It's been a while since I looked at the OSI, but from memory it is the session layer.Layer 5: The session layer...This layer sets up, coordinates, and terminates conversations, exchanges, and...
- Tags: networking, OSI, OSI Layer, srkcmk@...
- Q&A 2005-08-28
- RCL: A New Method for Cross-Layer Network Modelling and Simulation
- The evolution from wired network systems to wireless environments such as Ad-hoc networks enables the emerging of cross-layer systems to improve the wireless network performance. Efficient methods that may either produce or update cross-layer conceptual models have to be considered. Those models allow an efficient organization of the wireless systems....
- Tags: Method, Wi-Fi, Wireless
- White papers 2005-06-13
- Application-Layer Filtering in ISA Server 2004
- ISA Server 2004 is a sophisticated, application-layer aware firewall that uses a number of application filters to perform layer 7 inspection of communications moving through the firewall. ISA Server 2000 moves beyond the limitations of traditional packet-filtering firewalls to perform deep application-layer content inspection. This intelligent, application-layer filtering helps secure...
- Tags: Microsoft ISA Server, ISA Server 2004, Firewalls, Network Security, Security, Networking
- White papers 2004-06-01
- Multiple Layer Error Control Over Wireless Links
- This paper compares the wireless performance of TCP with or without selective acknowledgments and in the presence or absence of a reliable link layer protocol, in order to determine whether link layer error control remains beneficial for TCP variants with improved error recovery capabilities, such as TCP SACK. The paper...
- Tags: Performance, TCP, Error, Wireless, Tcp/Ip, Performance Management, Networking, Human Resources, Workforce Management
- White papers 2007-03-01
- Defend the network layer from malicious attack
- The network layer is key to the operation of the stack. In this sample chapter from Hack the Stack: Using Snort and Ethereal to Master the 8 Layers of an Insecure Network, begin by reviewing the protocols that reside here, such as Internet Protocol IP, Internet Control...
- Tags: Snort, Network, Malicious Attack, Syngress, Chapter Coverage, Networking
- Book chapters 2007-06-22
- Traffic-Based Reconfiguration for Logical Topologies in Large-Scale WDM Optical Networks
- Wavelength-Division Multiplexing WDM technology has emerged as a promising technology for backbone networks. The optical layer based on WDM technology provides optical routing services to the upper layers such as the packet - switching layer and the Time-Division Multiplexing TDM layer over the Generalized MultiProtocol Label-Switching GMPLS paradigm. The set...
- Tags: Topology, WDM, Optical Networking, Networking
- White papers 2005-10-01
- A Cross-Layer Strategy for Energy-Efficient Reliable Delivery in Wireless Sensor Networks
- This paper investigates the problem of the lifetime maximization in wireless sensor networks under the constraint of end-to-end transmission success probability, by adopting a cross-layer strategy that considers physical layer (i.e., power control), MAC layer (i.e., retransmission control) and network layer (i.e., routing protocol) jointly. The paper decouples the problem...
- Tags: Algorithm, Network, Sensor, Wireless, Engineering, Networking
- White papers 2006-12-01
- Sprint—Layer 2/Layer 3 Services Converged Over Common IP Backbone Via L2TPv3 in Cisco IOS Software
- A network convergence strategy expected to get top attention from service providers in the next few years is the ability to offer traditional Layer 2 transport protocols over a Layer 3 native Internet Protocol IP core. Sprint is among the first companies to test ...
- Tags: Software, Backbone, Cisco IOS, Layer 2, Cisco IOS Software, IP, Cisco Systems Inc., Sprint Communications, Networking
- Case studies 2003-03-01
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