Objective 6.4 Exchange 2010 Flashcards
Objective 6.4: Configure high availability for non-mailbox servers.
You need to know what steps to take to make use of the ______, introduced in Exchange Server 2010 SP1, which maintains a list of servers that are unavailable. You should be aware that enhanced DNS uses this list to filter out any unavailable servers when applying round robin logic for load balancing.
Healthy Server Selector
The exam might expect you to be aware that Exchange 2010 uses an enhanced DNS client to resolve the next hop selection to a list of target server names, and that enhanced DNS provides ______ functionality for Exchange 2010 transport servers by using round robin.
load-balancing
Round robin is typically used to distribute incoming messages from the ______. You can accomplish this by using DNS round robin and MX records that have the same preference value. In this way, you do not need to deploy a load-balancing solution to distribute the load across your Edge Transport servers, which can present problems—particularly with Windows NLB that requires Active Directory.
Internet
The exam might test that you know that if an external SMTP server needs to send a message to a specific mail domain, it runs a query against the target domain’s zone looking for ______ records.
MX
If the SMTP server is unable to deliver mail to the first address returned by the MX record query, it then attempts delivery to other ______ returned by the query.
addresses
The exam might test that you are aware that Client Access servers and Edge Transport servers can use Windows ______ as a part of their highavailability strategy, and that NLB distributes traffic between multiple hosts based on each host’s current load.
NLB
You can use the NLB Manager console to add and remove nodes to and from NLB clusters. Also, a node is ______ automatically if it fails.
removed
NLB clusters reconfigure themselves ______ when you add a new node or remove a node.
automatically
Each node in an NLB cluster sends a ______ message to all other nodes after a second, informing them of its status.
heartbeat
When a node fails to transmit five consecutive heartbeat messages, the other nodes in the cluster alter the configuration of the cluster, excluding the failed node. This is known as ______.
convergence
You can take an existing node in an NLB cluster offline for ______ and then return it to service without having to reconfigure the cluster manually.
maintenance
You can configure the operation mode of an NLB cluster by editing the cluster properties in the NLB ______.
Manager
The cluster operation mode determines how you configure the cluster’s network address and how that address relates to the existing network adapter addresses. All nodes within a cluster must use the same cluster operations mode. You can configure one of the following three cluster operations modes: ______.
- Unicast Mode
- Multicast Mode
- IGMP Multicast Mode
By default, a cluster ______ all traffic received on the cluster IP address across all nodes.
balances
However, you can use port rules to control how network traffic is treated by an NLB cluster on a ______ basis.
port-by-port
You can configure the cluster to forward traffic to a specific node rather than to all nodes so that the cluster can balance some but not all traffic. You accomplish this by configuring the port rule filtering mode. The options are ______ or ______.
multiple host, or
single host