A star topology is designed with each node (file server, workstations, and peripherals) connected directly to a central network hub, switch, or concentrator (See fig. Data on a star network passes through the hub, switch, or concentrator before continuing to its destination. A star topology typically uses a network hub or switch and is common in-home networks. Every device has its own connection to the hub. The performance of a star network depends on the hub. If the hub fails, the network is down for all connected devices.

The token ring network is designed to transmit a token, or a special frame, designed to go from node to node around the ring. As the frame passes, if a workstation needs to transmit data, it modifies the frame, attaches its data and sends it on. If the data is intended for the next workstation on the network, it receives the data and the information stops at that workstation. If it is intended for somewhere else on the network, the data is retransmitted around the ring until it finds its intended location. Once the data finds its new home, a blank token is transmitted and another workstation can attach data and then that data travels around the ring.

Small/Remote Site LANs Small/remote sites usually connect back to the corporate network via a small router (Cisco 2500). The local-area network service is provided by a small hub or LAN switch (Catalyst 1900). The router filters broadcasts to the WAN circuit and forwards packets that require services from the corporate network. A server may be placed at the small/remote site to provide DHCP and other local applications such as NT backup domain controller and DNS; if not, the router will need to be configured to forward DHCP broadcasts and other types of services. Shows a typical architecture of a small or remote LAN. Building Cisco Remote Access Networks from Cisco Press is an excellent resource for more information on remote access. Small/Remote Office LAN LAN Media The CCDA objectives covered in this section are as follows: 15 Recognize scalability constraints and issues for standard LAN technologies.

If a NIC fails or a cable is disconnected at any of the points in the network, it will not be terminated properly so all of the computers will lose connectivity to the network. Mesh Topology A mesh topology is one which all of the nodes are directly connected with all of the other nodes. A mesh topology is the best choice when you require fault tolerance, however, it is very difficult to setup and maintain. There are two types of mesh network: full mesh and partial mesh.

I feel like maybe you are remembering cert answers from a different era when different technologies and problems with those technologies existed and are trying to apply those things to today's systems? Token Ring was not chosen for this because it was a ring but because it was deterministic. A big deal in the unswitched Ethernet bus days of yore. You definitely CAN connect switches together in a ring topology and spanning tree will just block the bridging loop.

You can easy design Hotel Network Topology Diagram, diagrams depicted LANs and WLANs, and also any of eight basic topologies (Point-to-point, Star, Bus, Mesh, Ring, Tree, Hybrid, Daisy chain). Muhammad taha al junayd full quran rar. A Mesh Network Topology is a computer network topology built on the principle of cells. The network workstations are the mesh nodes, they are connected to each other, usually to the principle 'each with each' (a fully connected network) and interact in the distribution of data in a network. Each node relays the data for the network and can take the role of switch for other participants.

The network I manage now is 70% bigger than the one that existed when I started working for the college I'm at now, and much more sophisticated; but we always designed our upgrades and changes with an overall eye on where we were going so each change was a reasonably painless stepping stone to the next one. • Security - There are certain considerations here that might point you towards certain decisions - e.g. Do you want an 'administration' network for running the 'business' of the school to be kept separate/heavily firewalled from the 'academic' network (there are arguments for and against both, and the biggest decider might be which one fits the culture of the school the best). Do you want to keep certain classrooms separate/firewalled off from the 'main' academic network? • An appropriate level of resiliency - how much will it disrupt learning if you have a classroom get knocked offline? Do your students take exams 'electronically', either from a server on your LAN or via the Internet, and if so what happens if there's an outage?

Figure 16: The full mesh, on top, is both highly complex and highly fault tolerant. The partial mesh sacrifices some fault tolerance in favor of increased simplicity. Wireless Topologies Because the medium through which the signals are propagated (radio frequencies) has different properties than wires, wireless topologies differ greatly from wired topologies. The principles used in creating wireless networking solutions are based on the technology currently in use with cellular telephone systems. Cellular technologies are often described in terms of their 'generation': first, second, or third. The first generation is the analog cellular system, second-generation wireless is digital, and the third generation, which has yet to be developed, is often called UMTS: Universal Mobile Telecommunications System. This system is designed to provide digital, packet-switched, high-bandwidth, always-on service for everything from voice to video to data transfer.

Then block any protocol any any. Then you would add another one going out, with: block line blocking port 21 for every subnet's x.y.z permit line for every subnet allowing any traffic to x.y.z deny any any any Or? I just recently learned about ACLs, but that should work on a L3 swtich. Again, as long as someone can configrm that L3 switches usually support extended acls.

The logical bus transmission scheme is used in combination with both the physical bus and physical star topology. The MAC method can vary from case to case. For example, while thin Ethernet and 10Base-T Ethernet use the logical bus transmission scheme, cable on thin Ethernet networks is laid out as a physical bus, and on 10Base-T networks as a physical star. Thin Ethernet (physical bus) and 10Base-T Ethernet (physical star), however, both use the CSMA/CD MAC method. Figure 23 shows a thin Ethernet network (physical bus, logical bus), and Figure 24 shows a 10Base-T Ethernet network (physical star, logical bus). In both figures, notice that the network signal (shown by the arrows) emanates from the sending station and travels in all directions to all parts of the transmission media. Figure 23: Thin Ethernet network (physical bus, logical bus) Figure 24: 10Base-T Ethernet network (physical star, logical bus) Logical Ring In the logical ring topology, frames are transmitted in one direction around a physical ring until they have passed every point on the transmission media.

Network Cabling Issues A major part of implementing a network involves the installation of a cabling system. A solid cabling system is a good investment that will not only meet your current networking needs, but will last through your next-generation network as well. All modern Ethernet networks follow a star topology, where each device on the network connects with its own cable to a hub or some other device. If your network is contained in a single room, then you can simply use drop cables to connect each device on your network to a hub. If your network spans an entire building, then you will need to install a cabling system, and designate one or more wiring centers for your network. Cables originate at the location of each device on the network and terminate in a wiring center. On the user end, the cable will terminate with a wallplate and in the wiring center the cable will terminate in a jack on a patch panel.

Because of the misconfigured network each site was only getting around 5km bursts and the remote networks were very slow.the admin didn't understand why. If you are using dns you would have to have everyone on the same dns network. IMO it isn't big enough for subdomains, but that is at the disgression of the class. As to your dhcp/dns.figure out how they work, that will give you the answer. You may have learned about it in class, but if you asked that question you really didn't learn about it.it may have been gone over but it really wasn't gone over into any great detail.

This flavor of Ethernet relies on hubs. Each computer has a dedicated cable that connects its Ethernet card to a port on the hub. Ethernet hubs are relatively passive and require little or no configuration. In most cases, you can plug in the hub to power, connect the cable and you've got an active network. As we'll see later, there are several features to choose from when buying a hub, but almost all types are essentially plug-and-play devices. You will need drop cables to connect your computers to the network. Pre-built Ethernet cables are available from local computer stores and mail-order companies.

Disadvantages of a Linear Bus Topology • Entire network shuts down if there is a break in the main cable. • Terminators are required at both ends of the backbone cable. • Difficult to identify the problem if the entire network shuts down. • Not meant to be used as a stand-alone solution in a large building. A star topology is designed with each node (file server, workstations, and peripherals) connected directly to a central network hub, switch, or concentrator (See fig.

2) Easy to connect new nodes or devices. In star topology new nodes can be added easily without affecting rest of the network. Similarly components can also be removed easily. 3) Centralized management. It helps in monitoring the network. 4) Failure of one node or link doesn’t affect the rest of network. At the same time its easy to detect the failure and troubleshoot it.

Only the isolation LAN network is visible to the outside world. On the outside filter, you should advertise only the route to the isolation LAN. If internal users need to get access to Internet services, allow TCP outbound traffic from the internal corporate internetwork. Allow TCP packets back into the internal network only if they are in response to a previously sent request. All other TCP traffic should be blocked because new inbound TCP sessions could be from hackers trying to establish sessions with internal hosts.

Distribution Layer The distribution layer of the network is the demarcation point between the access and core layers of the network. NOTE When provisioning backup links, learn as much as possible about the actual physical circuit routing. Different carriers sometimes use the same facilities, meaning that your backup path is susceptible to the same failures as your primary path. You should do some investigative work to ensure that your backup really is acting as a backup. Backup links can be combined with load balancing and channel aggregation. Channel aggregation means that a router can bring up multiple channels (for example, Integrated Services Digital Network [ISDN] B channels) as bandwidth requirements increase. Cisco supports the Multilink Point-to-Point Protocol (MPPP), which is an Internet Engineering Task Force (IETF) standard for ISDN B channel (or asynchronous serial interface) aggregation.

Chapter Description This chapter from CCDA Exam Certification Guide reviews the topologies used in network design and covers the technologies and design approaches used when designing a local-area network (LAN). The hierarchical, redundant, and secure topology models are covered. Technologies like Ethernet, Fast Ethernet, FDDI, and Token Ring are also covered in this chapter.

One for each of the 24 network, where it blocks the other, and allows the 26 and at last either deny og permit any any. The second example could be done with an extended acl, as long as it's true that most L3 swtiches support extended acl. Because then you would add the following acl for the traffic coming in to the /26 interface: add the block the port 21 traffic first. Then add a permit line with the x.y.z for every single subnet.

Internally, the MAU of a star-wired ring contains wiring that allows information to pass from one device to another in a circle or ring (See fig. The Token Ring protocol uses a star-wired ring topology. Ring Topology In a ring network, every device has exactly two neighbors for communication purposes. All messages travel through a ring in the same direction (either 'clockwise' or 'counterclockwise'). A failure in any cable or device breaks the loop and can take down the entire network. To implement a ring network, one typically uses FDDI, SONET, or Token Ring technology.

Available at: (Accessed: 3 September 2016). Topologies, routing and deadlock (2016) Available at: (Accessed: 3 September 2016). Carrier sense multiple access (2016) in Wikipedia. Available at: (Accessed: 3 September 2016). Bus and Star Topology (2006), Explain the differences between Bus and Star Topology, Available at: (Accessed: 4 September 2016). Network Troubleshooting and resource site for school IT staff (2016) Available at: (Accessed: 4 September 2016).

Star is a basic computer network topology in which all nodes (computers and peripheral devices) of the network are connected to the central hub or switch with a point-to-point connection, forming a physical network segment. Such network segment can function separately or as a part of complex network topology. The switch is a server, the peripherals are the clients. The large workload and functions of network management are entrusted on the central computer, all information exchange goes through it, so it must to be obligatory the most powerful.