logical network design

If this is the case with your network, you have to consider several things. You may not have to worry about installing expensive equipment used by SONET and other typical MAN protocols. And NetWare's iFolder allows mobile users to synchronize data stored on remote computers (such as a laptop computer) with the data stored on the company's network. A network diagram can be either physical or logical. What will it cost to upgrade these programs to newer object-oriented languages? A logical network diagram describes the way information flows through a network. Logical topologies are bound to the network protocols that direct how the data moves across a network. Today, as long as the physical underlay is robust and scalable, the emphasis is on designing logical or virtual topologies. If you are upgrading older applications, several other factors come into consideration. Another important factor your management will probably force you to consider is cost—you can't forget the budget. Will you need to allow an Internet connection for just your internal network's users, or will use you need to allow outside vendors access to your network? A logical network diagram depicts how information in the network flows. For example, utilize dual fiber-optic uplinks from the wiring closets to the core switches. For example, could be the logical network used for our design. You need to assess work patterns for various departments so that you can appropriately place servers, high-bandwidth links, and other such things in the appropriate physical location of the network. Network diagrams, both logical and physical, are key to effective network and IT infrastructure management. A logical network diagram displays how information flows through a network, allowing you to see subnets, network devices, and routing protocols. The physical aspects of your LAN will depend on the underlying physical transport technology—Ethernet or Token-Ring, for example, or possibly ATM, which is now supported in products such as Windows 2000/XP and Server 2003 as a LAN protocol. You should always be proactively looking for potential single points of failure and doing something to fix them. Logical and Physical Network Design Logical and Physical Network Design Network design is a process that begins from the first thought on how to connect to computers together in order for them to communicate and pass needed data to each other. If users need to exchange email with vendors, outside consultants, or customers, for example, then you should be sure to send this traffic through a content filter or firewall, and use virus-protection software to detect and prevent malicious code or virus-infected attachments. Is this data reliable? I am referring instead to your knowledge of the job descriptions for the users on the network. Will any involve configuring a firewall between LANs? By building redundancy into the network design at the start, you'll save yourself a lot of grief in the future. Whatever list of applications you chose to support over the network, keep in mind two things: Is the application safe? Scott Mueller and Terry Ogletree talk about your network's logical and physical design, including planning and components of a logical network design, the physical network, and planning resources. Although there are other LAN technologies, such as ARCnet and Novell's IPX/SPX, these are basically legacy products that are no longer being deployed in newer networks. If you will be connecting the network to the Internet, TCP/IP will be a necessity. It provides many new features that are addressed to specifically make use of the Internet, and allow mobile users to connect to their home networks, as well as to enable NetWare users to make connections to outside networks. Network diagrams, both logical and physical, are key to effective network and IT infrastructure management. More information about securing your network can be found in Chapter 48, "Security Issues for Wide Area Networks," and Chapter 49, "Firewalls.". Before you can begin to design a physical network, however, you first must determine your needs. The two most common network diagrams you’ll come across are physical and logical. If your network is tiny, you may be able to create a logical network diagram by hand — or creating Visio network diagrams. Currently, TCP/IP version 4 is the most widely used protocol. Network uptime becomes more critical every year. When you plan a logical network design, you can start from one of two places. Your email address will not be published. In this case, you also can justify the cost of the extra link by using load balancing so that network response time is improved. Gliffy: Gliffy (Figure D) is the only Web-based tool on this list. Another cost associated with upgrading to new programs is training users and help-desk personnel. Many companies have policies that apply to using the telephone for personal business. > Easily create a diagram using the logical network diagram template above by signing up for a free Lucidchart account and then styling the diagram with our different formatting options. Older NetWare networks should upgrade, if possible, to one of these newer versions. Will you need to allow all users to use email—both within the internal network and through the firewall on the Internet? The 4 step is plan the network implementation which involves the … Even Microsoft's now-legacy NetBIOS/NetBEUI protocols have been adapted to run over TCP/IP. Spend time planning a design that provides network redundancy from a physical and logical perspective. They are used by IT professionals and corporate IT departments, network and system administrators to visually document the logical topology of computer networks. Here's networking expert Chris Partsenidis' explanation: "When designing a network, the "logical" part refers to the IP addressing scheme used within the network. And if so, that still doesn't account for configuring a firewall to enable access to the Internet. Physical design layout outlines the pieces of the logical design network which are in a given network architecture. Therefore, logical network diagrams typically show subnets (including VLAN IDs, masks, and addresses), network devices like routers and firewalls, and routing protocols. Logical network diagrams focus in on how traffic flows across the network, IP addresses, admin domains, how domains are routed, control points, and so on. Upgrading and Repairing Networks, 4th Edition, Computer Networking Problems and Solutions: An innovative approach to building resilient, modern networks, Mobile Application Development & Programming. A logical network layout clearly shows the IP Addresses associated with each part of the network. For example, to simplify administering configuration information for a large number of computers, you might want to use the Dynamic Host Configuration Protocol (DHCP), which is discussed in Chapter 29, "BOOTP and Dynamic Host Configuration Protocol (DHCP)." A logical network diagram usually shows network devices like routers, firewalls, and voice gateways. If a link between two offices needs to be up 100% of the time, you should plan for multiple links between the two sites to provide a backup capability. One example that comes to mind is the Internet Printing Protocol (see Chapter 25, "Overview of the TCP/IP Protocol Suite"). The distinction between LAN and WAN (wide area networking) protocols is beginning to blur. In addition to giving you a larger address space, IPv6 includes other important features. Of course, everyone knows that the most important function of a network today is to support multiuser gaming. The advantages of using a VPN are that you can send data across the Internet, which is less expensive than using a dedicated link, and mobile users can also use a VPN connection to connect to your network as they move from place to place. Because NetWare 6 is so tightly integrated with the IP protocol, and also offers backward compatibility with IPX/SPX, admins for existing NetWare networks should consider upgrading to NetWare 6 as well as considering other options. In this book, we talk about NetWare and ARCnet. Redundancy. You can find out more about RAID (Redundant Array Of Independent Disks) and UPSs (uninterruptible power supplies) by reading Chapter 5, "Protecting the Network: Preventative Maintenance Techniques." Blog: $60 million later, one company learned a priceless lesson: decommission your data center devices properly. Those that will affect your network the most are security mechanisms, which will only become more important as Internet commerce continues to grow. If you aren’t documenting the network, or you’re scrambling to keep up using a hybrid of post-it notes, Visio, and Excel — you may want to look at a network mapping tool to help you automatically discover and map the network in clicks. For example, ARCnet is now used mostly in vertical-market applications (such as on the factory floor, or for point-of-sale cash registers). Since the third edition of this book was published, Gigabit Ethernet devices have become very inexpensive (when you consider the bandwidth offered by this technology). Sub-interfaces, VLANs, virtual and tunnel interfaces separate traffic, and also allow various forwarding and security methods to be applied to individual flows. Every user has his or her favorite application. Buy 2+ books or eBooks, save 55% through December 2. this speaks of the actual physical layout of your network which includes the actual nodes, segments and hosts that appear on the actual layout. Depending on which technology you use, there will be one or more LAN topologies from which to choose. What kinds of services will you provide on the network? In most cases, the logical network is a simple Class C network such as with the default subnetmask of You can design and install a new network from scratch, or you can upgrade an existing network. The following are other factors to consider: Who are the clients? ConceptDraw Pro is a diagram construction tool that has developed a strong reputation amongst network administrators.… To meet a customer's goals for scalability and adaptability, it is important to architect a logical topology before selecting physical products or technologies. Because proxy servers are an important component of firewalls, this subject is covered in greater detail in Chapter 49. If you create a network from scratch, what factors should affect your network protocol decision? With this easily customizable template, users can represent any existing logical network design. In Chapter 4, "Upgrading Strategies and Project Management," you'll find more information about surveying the user community to come up with a plan that places resources where they are needed. For more information about SONET, ATM, and Frame Relay, see Chapter 16, "Dedicated Connections.". Seriously, though, you need to make a list of the kinds of applications currently in use, as well as a list of those requested by users. It's easy to use and it works on any … Consider the implications (such as support costs) to maintain older, proprietary protocols. Novell's NetWare products, while allowing for backward compatibility with the IPX/SPX protocol, have finally caught up with the times, and new installations will more than likely use the IP protocol. Physical Network Design The typical Top-Down approach to network design uses a systematic method to plan, design, and implement a new network. Besides, it refers to the arrangement of computers and other physical components. This network allows up to 254 hosts to be connected directly to it without the need of any routing. 10Gigabit Ethernet is now coming to market with a strong driving force that will probably make it the most widely used MAN protocol in the next year or two. If you are creating a new network and purchasing new applications, you will probably spend most of your time considering the licensing and other financial costs (training users, network personnel, and so on). In this chapter, we will look at another aspect of creating a network: the network's logical and physical design. If your network doesn’t fit in a shoebox, however, you will probably want to use some kind of automated network mapping software (such as netTerrain). Have a strong work ethic & excellent people sk…, Graphical Networks recently introduced our new netTerrain DCIM bundles: they give you the support you need to tackl…, Missed today's webinar on how our outside plant module netTerrain OSP helps you better manage your circuits and cab…, With so much change, it’s all but impossible to keep the infrastructure documented by hand and without some degree…, the following elements in your logical network topology, network mapping software (such as netTerrain), Meet Your SLAs with Network Diagram Software, How Network Diagrams & Documentation Overhaul Your Workflow, No Network Diagrams? If you want to provide a central name resolution service, you might choose the Domain Name Service (DNS), which is covered in Chapter 30, "Network Name Resolution." Save my name, email, and website in this browser for the next time I comment. To sum up, both logical and physical network diagrams play a key part in effectively managing the network. However, the point to remember is that if you already are a NetWare user, you don't have to throw out your existing investment and move to a Microsoft network, or even a Unix/Linux environment. © 2020 Graphical Networks LLC 814 W. Diamond Ave., Suite 370 Gaithersburg, MD 20878 USA. But when dealing with applications or application suites (such as Microsoft Office), you'll find it better to make a decision and stick with a single product if it can satisfy the needs of your users. What are their actual needs? For most users, the answer would be zero. They might not like it, and training might be necessary, but supporting multiple applications that do the same thing wastes money and leads to confusion. In real world deployments, there is usually a need for some users or applications to communicate with all users (eg system administrator). These factors make up the logical design for your network. Blog: By using DCIM for capacity planning, you improve operational efficiencies and can offset or defer costly data cente…, When a device goes down or a serious incident pops up, a cycle starts of stress and costs begins. This problem will apply mostly to proprietary computer architectures, instead of Windows or Unix platforms. A logical network is defined by its IP addressing scheme. Can your users tolerate a little downtime now and then due to network problems, or is it necessary to provide a high-availability network? While physical network diagrams are important, logical diagrams make network management easier in the following ways: As a logical or L3 network diagram should depict the logical network topology: in general, you’ll want to map out the following logical elements: Keep in mind that network diagrams are only as valuable to you as they are up-to-date. For a detailed introduction to TCP/IP, see Chapter 25, "Overview of the TCP/IP Protocol Suite"; Chapter 26, "Basic TCP/IP Services and Applications"; and Chapter 28, "Troubleshooting Tools for TCP/IP Networks.". Don't leave any backdoors into or out of your network. Your email address will not be published. There are two primary parts to the topology definition: the physical design, which is the actual layout of the wire (media), and the logical design, which defines how the media is accessed by the hosts. The old saying "If it ain't broke, don't fix it" doesn't apply to networks. Hannah Ash is a marketing specialist who loves thinking, writing and speculating about the future of the data center. For example, Chapter 2 discusses redundant topologies that can be used to prevent a single point of failure from making the network (and its resources) unavailable. Yet there are cases in which other technologies have their niches. Cabling plays an important part of network design as it provides … In this chapter, we will look at another aspect of creating a network: the network's logical and physical design. How have you determined these needs—from user complaints or from help-desk statistics? Ethernet is the most popular LAN technology in the world today. Don't replace tools that do a good job with a lesser tool that “does it all".... And, if you are using multiple links to remote sites, it's always a good idea to have more than a single path to the site. The logical network divisions created by these subnets mimic the logical security divisions necessary between servers and the clients that access them. There are "secure" versions of these applications and there are versions that leave a door wide open into your network. What will it cost to update thousands of lines of code (or more) to more modern versions of the same programming language? 1 | P a g e TOP DOWN NETWORK DESIGN METHODOLOGY PHASE 2: – LOGICAL DESIGN During the logical network design phase, the network designer develops does the following:--Network topology depending on the size of the network and traffic characteristics, the topology can range from simple to complex, requiring hierarchy and modularity.-Devises a network layer addressing model and selects … NetWare 6.x provides backward compatibility with IPX/SPX for the most part, but newer features such as the iPrint—which uses the Internet Printing Protocol—require TCP/IP. In the future you can expect that the next version (IPv6) will start to find its way from the core of the Internet out to the edge, where your network resides. Ethernet was once considered to be a LAN protocol. It shows subnets, VLAN IDs, subnet masks and IP addresses. Plan and design the cable layout. And because TCP/IP is so intertwined with Ethernet, you can achieve an end-to-end MAN link that uses TCP/IP over faster Ethernet connections. While technologies such as Network Address Translation (NAT) are widely employed to remedy the problem associated with the limited address space provided by IPv4, IPv6 will enable a much larger address space. Combine that with Network Address Translation, and the long-term bets are going to be on IPv6, or possibly some of the features that are part of IPv6. The terms RAID and UPS are important in today's networks, as is the concept of load balancing and dual-redundant power supplies in large networks. Are you preventing access to sites that are obviously not business-related? The segmented logical network design improves scalability, performance and security, and addresses the challenges of a flat network design. If a tree falls, will it bring down one or both of those power lines? Will you need clustered servers to provide for a high degree of uptime, or do your users' applications not suffer from a temporary loss of the use of a server? The basic file and print services offered by early versions of NetWare were much better than other solutions available at that time. It is interesting to note that in Windows NT 3.51, the default network protocol was Microsoft's implementation of IPX/SPX (NWLink). Important components of your network, such as file servers, should have fault tolerance built in from the bottom up.

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