You are an Enterprise administrator for contoso.com. The corporate network of the company consists of a single Active Directory domain. All the servers in the domain run Windows Server 2008 and all client computers run Windows XP Service Pack 1.
You have been assigned the task to plan the deployment of Distributed File System (DFS) to provide redundancy in the event that a single server fails in the minimum cost. You also need to ensure that the client computers reconnect to their preferred server after a server failure is resolved.
Which of the following options would you choose to accomplish the desired goal? (Select two. Each correct answer will present a part of the answer)
A.
Upgrade all client computers to Windows XP Service Pack 2.
B.
Upgrade all client computers to Windows Vista.
C.
Implement a stand-alone DFS namespace, create folders, add multiple targets, and enable the clients fail back to preferred targets option.
D.
Implement a domain-based DFS namespace, add a second namespace server, and enable the clients fail back to preferred targets option.
Explanation:
To plan the deployment of Distributed File System (DFS) with the given requirements, you need to upgrade all client computers to Windows XP Service Pack 2 to use DFS and implement a domain-based DFS namespace. You need to then add a second namespace server and enable the Clients fail back to preferred targets option.
Rather than having every user in your organization access their files from the same server, you can distribute the user workload across multiple DFS replicas rather than over burdening a single server. Domain based namespaces should be used here because Domain based namespaces require all servers to be members of an Active Directory domain. The DFS supports automatic synchronization of DFS targets. Ina domain environment, a server is capable of hosting multiple DFS roots that provides you with a degree of scalability.
Another reason for having multiple DFS replicas is because doing so provides you with a degree of fault tolerance.DFS can also provide fault tolerance from the standpoint of protecting you against network link failures.
You should add a second namespace server and enable the Clients fail back to preferred targets option to ensure a client failback on the namespace (or on specific folders in your namespace). So, when the failed target comes back online the client will fail back to that target as its preferred target.
If your WAN links are unreliable, you might find your clients frequently accessing different targets for the same folder. This can be a problem, for by default, DFS caches referrals for a period of time (300 seconds or 5 minutes) so if a target server suddenly goes down the client will keep trying to connect to the target and give an error instead of making the resource available to the client from a different target. To prevent this from happening (especially non-optimal targets), you can configure a client failback to preferred targets option on the namespace.
http://www.windowsnetworking.com/articles_tutorials/Configuring-DFS-Namespaces.html
Reference
: Planning a DFS Architecture, Part 1/ Planning a DFS Architecture, Part 2 / Domain-Based Namespaces
http://www.petri.co.il/planning-dfs-architecture-part-one.htm