Week 4 Discussion (VLAN Backbones) - TopicPrintView Week4:Wired,WirelessLANs,andBackboneNetworks Discussion VLANBackbones(graded ? Responses Response

Week 4 Discussion (VLAN Backbones) - TopicPrintView...

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Unformatted text preview: 9/25/2016 Topic Print View Week 4: Wired, Wireless LANs, and Backbone Networks ­ Discussion VLAN Backbones (graded) Discuss the advantages and disadvantages of VLANs? How can a VLAN architecture improve LAN performances? Responses Response Author VLAN's Advantages Professor Gander Date/Time 9/17/2016 6:29:22 PM Class, let's start by discussing the advantages of VLAN's. RE: VLAN's Advantages Jermaine Huggins 9/18/2016 10:05:33 PM A backbone network is a high speed network that connects many networks in a single company or government site. It may also be called an enterprise network if it connects all networks within a company. Two basic components to a backbone network: The network cable ­ essentially the same as used in LANs, except it is usually higher quality to provide higher data rates. The hardware devices that connect other networks to the backbone ­ special purpose devices and computers that just transfer messages from one network to another. Backbone network Devices: Hubs Bridges Switches Routers or (brouters) Gateways There may be different layers of routers and switches and/or it can also mean the difference between dependable service and frustrating downtime. Relative to the layered OSI model, a switch is usually associated with layer 2, the data­link layer. But, some switched also perform the routing functions of layer 3, the network layer. Layer 3 switches are called at times an IP switch. Lastly, selecting a backbone network might have certain factors to consider such as: (Throughput, network cost, and type of application). We also have the selection process for a BN for ease of management, and compatibility with current and future technologies. Reference: Business Data Communications & Networking, Notes for week 4(Local Area and Backbone Networks) ­vs­switch RE: VLAN's Advantages Jermaine Huggins 9/18/2016 10:06:55 PM According to our text a backbone network (BN) is "A large network to which many networks within an organization are connected. It usually is a network that interconnects all networks on a single site, but it can be larger if it connects all the organization's terminals, computers, mainframes, (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 1/28 9/25/2016 Topic Print View LANs, and other communication equipment." Types of Backbone: Serial Backbone ­ Serial backbone is formed of two or more devices that are connected in a daisy chain (linked series). It is a simplest kind of backbone. As the one can see from Figure 1, serial backbone can be made not only from switches, but also from gateways and routers. Distributed Backbone ­ Distributed backbone uses hierarchical design of the network, where number of intermediate devices are connected to single or multiple connectivity devices. Collapsed backbone ­ This type of backbone uses single, powerful router as the central connection point for multiple subnetworks. It should have powerful computational power in order to manage big traffic coming in. This is highly risky, since if the central device fails, the whole network would be down. However, this type of backbone is useful for the one who wants to interconnect two types of subnetworks, with ability to manage and troubleshoot them. Parallel backbone ­ Parallel backbone is a variation of the collapsed backbone, where devices are having more than one connection between them. Duplicate connections ensure networks availability at anytime, higher speeds, and high fault tolerance. Logical drawback of this solutions is the increased price, since amount of required cabling is highly increased. It is not obligatory to have duplicate connections between all the devices, selective implementation of parallel structure would significantly lower the overall price and make additional ports of the devices available. Source: ­ FitzGerald, Jerry, Alan Dennis, Alexandra Durcikova. Business Data Communications and Networking, 12th Edition. ­ ­of­backbone­networks/ RE: VLAN's Advantages Carlos Flores 9/22/2016 5:24:58 AM This gives us a glimpse into the future as well. Being that VLANs are BN backed, we can see that the future will use these networks because of the "intelligent, high­speed switches" that they use (FitzGerald, 2014). And, since many technologies are moving towards being software driven more than hardware driven, the opportunities to further improve on networks will increase. As one example of an advantage of a VLAN, we see that the segmentation increases speed due to its capacity to differentiate between groups of devices being in different departments and still being able to communicate. Reference: FitzGerald, Jerry, Alan Dennis, Alexandra Durcikova. Business Data Communications and Networking, 12th Edition. Wiley, 08/2014. VitalBook file. RE: VLAN's Advantages Karly Derosena 9/19/2016 8:41:39 AM Disadvantage of VLAN:­ (High risk of virus infects..if one system of a Vlan infected by virus then it may be infect all the system of that Vlan). RE: VLAN's Advantages Omolabake Dawodu 9/21/2016 12:57:52 PM Modified:9/21/2016 1:01 PM According to out textbook, there are several benefits to using VLANs. Virtual LAN's can be viewed as a group of devices on different LAN segments which can communicate with each other as if they were all on the same physical LAN segments. VLANs are build with traffic patterns in mind and using VLANs, gives the ability to group devices into a single domain, which allows us to confine broadcast traffic for this workgroup to just those devices need to see it and it reduce traffic to the rest of the network which would increase connection speed due to the elimination of latency from router connections. VLANs also provide an easy, flexible, less costly way to modify logical groups in changing environments. VLANs makes large network more manageable by allowing centralized configuration of devices located in assorted devices. (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 2/28 9/25/2016 Topic Print View FitzGerald, Jerry, Alan Dennis, Alexandra Durcikova. Business Data Communications and Networking, 12th Edition. Wiley, 2015. VitalSource Bookshelf Online. RE: VLAN's Advantages Jermaine Huggins 9/24/2016 10:58:16 PM Advantages ­ Higher performance and reduced latency. ­ users may work on sensitive information which should not be seen by other users. ­ VLAN Removes the physical boundary Disadvantages ­ Management is complex ­ Possible problems in interoperability ­ A VLAN cannot forward traffic to another VLAN(need a router to communicate between VLANs) RE: VLAN's Advantages Christopher Grindey 9/19/2016 10:20:45 AM There are some advantages of using VLAN's. Ease of managing is one. Since VLANS are easily configured, even over large geographical areas, administrators can manage large global networks from one location. Another advantage would be in the physical layer interdependence. There can be different physical media used throughout the network and the VLAN can be integrated without the user knowing. Finally, costs are cheaper. Routers are more expensive than switches in general. RE: VLAN's Advantages Shauna Allen 9/19/2016 2:01:04 PM Advantages of VLANs VLANs provide a number of advantages, such as ease of administration, confinement of broadcast domains, reduced broadcast traffic, and enforcement of security policies. VLANs provide the following advantages: VLANs enable logical grouping of end­stations that are physically dispersed on a network. When users on a VLAN move to a new physical location but continue to perform the same job function, the end­stations of those users do not need to be reconfigured. Similarly, if users change their job functions, they need not physically move: changing the VLAN membership of the end­stations to that of the new team makes the users' end­stations local to the resources of the new team. VLANs reduce the need to have routers deployed on a network to contain broadcast traffic. Flooding of a packet is limited to the switch ports that belong to a VLAN. Confinement of broadcast domains on a network significantly reduces traffic. By confining the broadcast domains, end­stations on a VLAN are prevented from listening to or receiving broadcasts not intended for them. Moreover, if a router is not connected between the VLANs, the end­stations of a VLAN cannot communicate with the end­stations of the other VLANs. (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 3/28 9/25/2016 Topic Print View ­C9DA920B­F414­4017­ 8DD1­D77D7FD3CC8C.html From what I read, VLAN seems like it is a simple set­up using software rather than hardware. "Virtual LANs are networks in which computers are assigned to LAN segments by software rather than by hardware" (FitzGerlad & Durcikova, 2015, p. 229). It states that VLANs can be faster and can better manage traffic flow. For a large company with a great number of people, it seems like this would be a huge benefit and a good way to go. FitzGerald, J., Dennis, A., Durcikova, A. (2015). Business Data Communications and Networking, 12th Edition. [VitalSource Bookshelf Online]. Retrieved from RE: VLAN's Advantages Winifred Oloni 9/19/2016 2:21:56 PM VLANs provide a number of advantages, such as ease of administration, confinement of broadcast domains, reduced broadcast traffic, and enforcement of security policies. VLANs provide the following advantages: VLANs enable logical grouping of end­stations that are physically dispersed on a network. When users on a VLAN move to a new physical location but continue to perform the same job function, the end­stations of those users do not need to be reconfigured. Similarly, if users change their job functions, they need not physically move: changing the VLAN membership of the end­stations to that of the new team makes the users' end­stations local to the resources of the new team. VLANs reduce the need to have routers deployed on a network to contain broadcast traffic. Flooding of a packet is limited to the switch ports that belong to a VLAN. Confinement of broadcast domains on a network significantly reduces traffic. By confining the broadcast domains, end­stations on a VLAN are prevented from listening to or receiving broadcasts not intended for them. Moreover, if a router is not connected between the VLANs, the end­ stations of a VLAN cannot communicate with the end­stations of the other VLANs. ­C9DA920B­F414­4017­8DD1­ D77D7FD3CC8C.html RE: VLAN's Advantages Molly Devuono 9/19/2016 4:42:39 PM VLANs: ­ can provide better enforcement of security policies ­ logical grouping of end stations ­ reduced broadcast traffic ­ they are faster and manage flow better ­ computers can be in different geographic locations and still in the same subnet ­ gives you the ability to prioritize traffic RE: VLAN's Advantages Omar Fares 9/20/2016 5:51:20 PM The advantages of VLAN's are: VLAN provides increased performance VLAN provides improved manageability VLAN simplifies software configurations VLAN provides increased security options (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 4/28 9/25/2016 Topic Print View RE: VLAN's Advantages Elh Ibrahima Barry 9/20/2016 7:42:52 PM A VLAN (Virtual Local Area Network or Virtual LAN) is a local network of a set of logical machines, not physical. It is an independent logical computer network. Many VLANs can coexist on the same network switch. Indeed in a local network, communication between different machines is governed by the physical architecture. With virtual networks (VLANs) it is possible to overcome the limitations of the physical architecture (geographic constraints, addressing constraints, etc.) by defining logical segmentation (software) based on combination machines through criteria (MAC addresses, port numbers, protocol, etc.). Here are some of the advantages or benefits of the VLAN: VLAN is used to define a new network above the physical network and it offers the following benefits: More flexibility in administration and network changes because all the architecture can be modified simply by setting various switches Gain in security, because information is encapsulated in an additional level and possibly analyzed Reducing the dissemination of traffic on the network Improve network management Separate streams Fragmentation: reduce the size of a broadcast domain Security: VLAN helps improve protection. The only way to communicate between machines belonging to different VLANs goes through a router. RE: VLAN's Advantages Joseph Office 9/21/2016 6:14:56 AM A VLAN has some unique differences and similarities to the basic physical LAN. In the name VLAN is virtual, so some users may be confused or think that a VLAN somehow creates new devices or at the least attempts to represent new devices in a virtual manner. The prime advantage of VLAN is that is does not have the limits that are imposed on LANs that utilize physical switches where devices have to be physically connected to each other. A VLAN removes this limitation so that devices can communicate with other devices not necessarily in their specific location but yet can behave as if they are in unison. In other words, the logical and physical topographies are distinct. VLAN allows devices that are configured on the same switch to communicate with each other while excluding other VLANs that are not configured to the same switch regardless of their physical location. Wilkins, S. (2015, May 29). Virtual vs. physical LANs: Device functionalities. Pearson IT Certification. Retrieved from ? p=2343470&seqNum=2 RE: VLAN's Advantages Jeremy Rak 9/20/2016 8:54:28 PM Professor and Classmates, LANs of the past must be grounded within the limited area of the LAN but now with VLAN technology, this device can perform as a switch and also have computers on designated subnets but no longer grounded to a certain location (FitzGerald, et al, 2015). This improves architecture by allowing computers from different departments move around the building while remaining the correct subnet. However, according to FitzGerald, et al, (2015) this advantage is costly. ~Jeremy FitzGerald, J., Dennis, A., Durcikova, A. (2015). Business Data Communications and Networking, 12th Edition. [VitalSource Bookshelf Online]. Retrieved from (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 5/28 9/25/2016 Topic Print View RE: VLAN's Advantages Melody Barnhill 9/20/2016 9:53:59 PM Modified:9/21/2016 12:43 PM Advantages Switched networks by nature will increase performance over shared devices in use today by reducing collisions. Grouping users into logical networks will also increase performance by limiting broadcast traffic to users performing similar functions within workgroups. Additionally, less traffic will need to be routed, and the latency added to routers will be reduced. VLANs provide an easy, flexible, less costly way to modify logical groups in changing environments. VLANs make large networks more manageable by allowing centralized configuration of devices located in assorted locations. VLANs will allow LAN administrators to "fine tune" their networks by grouping users. Software configurations can be made the same across machines with the consolidation of a department's resources into a single subnet. IP addresses and subnet masks will be more consistent across the entire VLAN. These services can be more effectively deployed when they can span buildings within a VLAN. VLANs have the ability to provide additional security not available in a shared network environment. A switched network delivers packets only to the intended recipients and packets only to other members of the VLAN. This allows the network administrator to segment users requiring access to sensitive information into separate VLANs from the rest of the general users regardless of physical location. Disadvantages The number of Ethernet addresses than can be supported by each device is 500. This is a distribution of about 20 devices per port on a 25 port switch. In an ideal network situation, there is one device per port, for example, a printer, a workstation, and voice IP phone will require 3 ports. If you wanted to have one VLAN assignment for each port, then the maximum VLANs will equal 25. If a hub or switch is connected to one port, every port on that hub must belong to the same VLAN. Hubs do not have the capability to provide VLANs to individual ports, and VLANs can not be extended beyond the device port even if a switch capable of supporting VLANs is attached. RE: VLAN's Advantages Samuel Amadasun 9/21/2016 7:00:04 AM I did more research and found a website that lists some advantages of VLANs. One advantage is that it provides broadcast control which is essential for normal network functions. Another advantage is that it provides excellent security since network administrators are able to oversee each port and determine which resources can and cannot be used. VLANs are also inexpensive when compared to router networks and provide physical layer transparency. ­certified­network­associate­ccna/advantages­of­vlan.php RE: VLAN's Advantages Cheikh Kebe 9/21/2016 5:03:01 PM Here are the main advantages .Broadcast Control: Broadcasts are required for the normal function of a network. Many protocols and applications depend on broadcast communication to function properly. .Security: VLANs provide enhanced network security. In a VLAN network environment, with multiple broadcast domains, network administrators have control over each port and user. .Cost: Segmenting a large VLAN to smaller VLANs is cheaper than creating a routed network with routers because normally routers costlier than switches. .Physical Layer Transparency: VLANs are transparent on the physical topology and medium over which the network is connected. (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334577&so… 6/28 9/25/2016 Topic Print View Thank you! Cheikh RE: VLAN's Advantages Muhammad Omar Jawed 9/21/2016 6:33:00 PM The main advantages of VLAN are listed below. • Broadcast Control: Broadcasts are required for the normal function of a network. Many protocols and applications depend on broadcast communication to function properly. A layer 2 switched network is in a single broadcast domain and the broadcasts can reach the network segments which are so far where a particular broadcast has no scope and consume available network bandwidth. A layer 3 device (typically a Router) is used to segment a broadcast domain. If we segment a large LAN to smaller VLANs we can reduce broadcast traffic as each broadcast will be sent on to the relevantVLAN only. • Security: VLANs provide enhanced network security. In a VLAN network environment, with multiple broadcast domains, network administrators have control over each port and user. A malicious user can no longer just plug their workstation into any switch port and sniff the network traffic using a packet sniffer. The network administrator controls each port and whatever resources it is allowed to use. VLANs help to restrict sensitive traffic originating from an enterprise department within itself. • Cost: Segmenting a large VLAN to smaller VLANs is cheaper than creating a routed network with routers because normally routers costlier than switches. • Physical Layer Transparency: VLANs are transparent on the physical topology and medium over which the network is connected. RE: VLAN's Advantages Eric Flores 9/21/2016 9:14:47 PM Layer 2 switches configured with VLANs are switches that provide extra capabilities similar to routers. The following are the benefits of routing with VLANs: LAN Segmentation, security, broadcast control, performance, network management, and communication between VLANs. These benefits make a LAN, especially ...
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