computer networksConverting a Network A recent university graduate gets a job as a network administrator for a mid-size company that has a network with ring topology with UTP cable using the token passing access method. UTP is also the cable use to link one ring (segment) to another via hubs. The nodes connected to the network use ISA NICs. The company is using the IPv4 addressing scheme, and BOOTP is being used to assign addresses to network nodesThe new network administrator wants to switch to a star topology using fiber optic cable for backbone and distributed backbone. The network would use Ethernet architecture with the CMSA/CD access method. (You need to state which Ethernet standard he should recommend and why.)The network would use routers for connectivity devices instead of hubs. Also, he wants to switch to the IPv6 addressing scheme, and he wants to use DHCP to assign addresses to network nodes.If he needs to leave a segment as a token ring, what connectivity device should he use so that would allow connecting two systems with different architectures? What does this type of device do that allow information from one system to be read by another. The OSI model layer at which connectivity device operate has an impact on what would be useful and how they impact the network. Include a discussion of which layer of the OSI model the connectivity devices mentioned in this question operate at and how that affects their function in the network.What would be the benefits of the changes he wants to make? What would be the challenges? What objections might management have to making the changes and what would be his arguments in response to those objections?For the purposes of this question you do not need to know about the token access method. You just want to explain the features and benefits of CSMA/CD. Also, your discussion of the backbone network choice should explain why that would be a good choice compared to other backbone networks.

1. Refer to the infographic provided and chose a biome to     describe with an example ecosystem. 
2. Provide one     example of a keystone species found in the biome/ecosystem.      Why is this keystone species important to the biome/ecosystem?      What defines it as a keystone species?
3. Provide an example     of an invasive species found in the biome/ecosystem.  What are     some of the negative impacts this invasive species has on the     ecosystem?  What is being done to mitigate impacts?
4. Provide one example of an endangered species found in the     biome/ecosystem.  Briefly discuss the causes of the decline in     the species and what is being done to help.   

Please include at least three academic sources and make sure   all sources are cited in your essay.