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Chapter 4: Designing the Logical Components

TRUE/FALSE

     1.   LAN Manager authentication is viewed as a security risk to any network.

     2.   Machine account names cannot exceed 10 characters.

     3.   It is possible to authenticate Linux, UNIX, and Mac OS X clients against Active Directory through the Kerberos protocol.

     4.   The disadvantage of an in-place upgrade is that user accounts have to be moved from one domain to another.

     5.   Restructuring domains involves moving accounts from a nonupgraded domain to a Windows Server 2003 Active Directory domain.

MODIFIED TRUE/FALSE

     1.   A properly created GPO design provides an environment with a reduced total cost of ownership by locking systems down and providing a consistent, standard configuration to groups of machines while providing an overall environment that is simple to implement and maintain. _________________________

     2.   Global scope information is not replicated outside its home domain. _________________________

     3.   When accounts are created in a domain or forest, ADMTs are created to correspond to the account. _________________________

     4.   In a work-group or peer-to-peer design, systems handle authentication globally. _________________________

     5.   Delegation by geography provides an Active Directory design that closely mimics the organization’s hierarchical structure. _________________________

MULTIPLE CHOICE

     1.   _____ work(s) in conjunction with discretionary access control lists to provide a means for controlling user’s access to network resources.

a.	Security groups	c.	Domain local scope
b.	Distribution groups	d.	Global scope

     2.   _____ is/are used to define and control access to resources within a single domain.

a.	Security groups	c.	Domain local scope
b.	Distribution groups	d.	Global scope

     3.   Which of the following object types is a container that is used to control authentication and replication traffic across links that are not well-connected?

a.	Contact	c.	Site
b.	Shared folder	d.	InetOrgPerson

     4.   To create a forest trust between Windows Server 2003 forests, it is necessary to change the forest functional level to a(n) _____ native functionality.

a.	NTLM	c.	UPN
b.	Kerberos	d.	.NET

     5.   _____ domains generally exist where some degree of autonomy or self-sufficiency is required within different portions of an organization.

a.	Single	c.	Regional
b.	Peer	d.	In-place

     6.   _____ involve upgrading from a pre-Windows Server 2003 domain environment to Windows Server 2003’s Active Directory using the same domain name and structure as that used in the original enterprise design.

a.	In-place upgrades	c.	Authorization
b.	Authentication	d.	Domain trusts

     7.   _____ is the process of verifying an identity for the purpose of authorizing or granting certain permissions to that identity.

a.	In-place upgrade	c.	Link replication
b.	Data access	d.	Authentication

     8.   _____ trust exists between a forest root and an external Kerberos domain.

a.	Transitive	c.	Shortcut
b.	Realm	d.	Two-way

     9.   Delegation by _____ provides a hierarchical model that mimics the organization’s geographic distribution.

a.	object type	c.	location
b.	function	d.	trust

   10.   _____ groups are used in conjunction with DACLs to regulate users’ access to resources in Active Directory.

a.	Domain trust	c.	Object type
b.	Machine policy	d.	Data access

   11.   Windows Server 2003 includes which of the following security groups to provide data access control?

a.	Global groups	c.	OU groups
b.	Site groups	d.	Intrasite domain groups

   12.   The _____ is a new utility available in Windows Server 2003 that provides role-based account creation and management capabilities.

a.	InetOrgPerson	c.	Authorization Manager
b.	NTLM	d.	Knowledge Consistency Checker

   13.   _____ contains all class and attribute definitions for the forest.

a.	Site container	c.	Domain partition
b.	Schema partition	d.	Configuration partition

   14.   A(n) _____ is an AD object that may be configured to mimic the physical layout of LAN segments of the overall network design.

a.	object type	c.	site container
b.	shared folder	d.	single-domain

   15.   _____ provides a mechanism for incremental replication of multivalued attributes.

a.	Link replication	c.	Intersite replication
b.	Intrasite replication	d.	Knowledge Consistency Checker

   16.   _____ takes place using a ring topology that Active Directory predefines as each domain controller is introduced to the site.

a.	Link replication	c.	Intrasite replication
b.	Knowledge Consistency Checker	d.	Intersite replication

YES/NO

     1.   Does increasing password lengths and enabling password complexity increase the level of security provided by Windows Server 2003?

     2.   Is LM authentication significantly stronger than NTLM authentication?

     3.   Generally, if your Windows NT 4.0 environment relies on LMRepl to replicate logon scripts, is the use of FRS to replicate the contents of the sysvol folder on all Windows 2000 Server and Windows Server 2003 domain controllers a sufficient replacement solution?

     4.   Is the domain administrator the owner of all the objects within the AD infrastructure?

     5.   In an effort to reduce latency, if users frequently access resources in a separate domain tree, can you create a shortcut trust to shorten the trust path that authentication must follow?

COMPLETION

     1.   ____________________ replication provides administrators with the capability to make changes to information on any domain controller within the domain, with the guarantee that changes will be propagated to all the domain controllers within the domain.

     2.   ____________________ standardization refers to common elements between forests.

     3.   ____________________ standardization works within a single partition of the Active Directory forest.

     4.   ____________________ relationships allow users hosted by one forest to access resources located in a separate, external forest.

     5.   ____________________ domains stem from independent domain tree roots, each carrying its own namespace.

MATCHING

Match each item with a statement below.

a.	Bridgehead servers	f.	Shortcut trusts
b.	Knowledge Consistency Checker	g.	Backup operators
c.	Split-brain DNS	h.	Global groups
d.	Transitive trusts	i.	GPMC
e.	Kerberos realm

     1.   Utilizes two ISP-hosted external DNS servers and two internally hosted DNS servers.

     2.   May be transferred between common forests or domains.

     3.   Shorten the authentication path within an Active Directory forest.

     4.   The replication gateway between sites.

     5.   An administrative boundary for an environment utilizing Kerberos authentication.

     6.   Administrative access group.

     7.   Provides an interface for simulating Group Policy implementations as well as reporting functionality and other new ease-of-use features.

     8.   Applicable forestwide.

     9.   Responsible for defining the replication topology for intrasite replication.

           

SHORT ANSWER

     1.   How has the Inter Site Topology Generator (ISTG) been modified from the ISTG of Windows 2000 Server?

     2.   List the four options that exist for organizations that require internal and external namespace.

     3.   What are the responsibilities of OU owners?

     4.   A centralized management model may utilize AD’s delegation capabilities to delegate specific tasks for an Active Directory container. Provide a list of tasks that can be delegated through Active Directory.

     5.   What are the major benefits of Active Directory’s replication model?

Chapter 5: Name Resolution

TRUE/FALSE

     1.   By default, if during an update process WINS is presented with both a static and dynamic-type entry for the same name, the static entry will be preserved.

     2.   A caching-only name server periodically checks for changes made to the zone on its configured primary DNS server and performs full or incremental zone transfers as needed.

     3.   The best way to keep outsiders from gaining access to your internal DNS server is to configure your firewall to explicitly allow only UDP and TCP port 53 communications between the servers.

     4.   One key difference between a DNS server set for high-level security and one set for medium-level security is that a high-level configuration contains a domain controller as well as a DNS server, and the DNS zone information is stored within Active Directory.

     5.   Primary zones are read-only and are updated only through zone transfers.

MODIFIED TRUE/FALSE

     1.   A(n) external namespace is used for managing resources on a private network. _________________________

     2.   BIND, version 5, provides the greatest degree of interoperability with Windows 2003 in a heterogeneous DNS environment. _________________________

     3.   A standard primary zone is hosted on the master servers in a zone replication scheme. _________________________

     4.   The DACL for a particular zone can be viewed and managed through the DNS Management console under the Security tab of the zone properties. _________________________

     5.   The DNS system is a collection of zone files that are spread out throughout the Internet as well as private networks. _________________________

MULTIPLE CHOICE

     1.   A(n) _____ zone is an authoritative DNS zone that is used primarily to resolve IP addresses to network resource names.

a.	reverse lookup	c.	recursive
b.	stub	d.	transitive

     2.   A(n) _____ query is a request from a host to a resolver to find data on other name servers.

a.	reverse	c.	recursive
b.	stub	d.	zone

     3.   _____ are useful for reducing the number of DNS queries on a network, and consequently the resource consumption on the primary DNS servers for that particular namespace.

a.	Zone transfers	c.	Address records
b.	Incremental transfers	d.	Stub zones

     4.   _____ is the process of copying contents of the zone file on a primary DNS server to a secondary DNS server.

a.	DNSSEC	c.	DNS notify
b.	Zone transfer	d.	Reverse lookup

     5.   When using _____ zone transfers, the secondary server retrieves only resource records that have changed within a zone so that it remains synchronized with the primary DNS server.

a.	DNS notify	c.	recursive
b.	full	d.	incremental

     6.   _____ allows a primary DNS server to utilize a “push” mechanism for notifying secondary servers that it has been updated with records that need to be replicated.

a.	Incremental transfer	c.	Full transfer
b.	DNS notify	d.	Recursive transfer

     7.   A(n) _____ is part of DNS’ database structure that contains the name information for a particular host or zone.

a.	Resource Record	c.	BIND
b.	PTR	d.	CNAME

     8.   _____ resource records identify the name of the root of the zone and contain the name of the server that is the primary source for information about the zone.

a.	Canonical Name	c.	Address
b.	SOA	d.	Stub

     9.   _____ records are used for creating aliases for hosts.

a.	PTR	c.	Address
b.	SOA	d.	CNAME

   10.   _____ allow for the distribution of data and also for the management of localized DNS databases.

a.	SOAs	c.	Reverse lookups
b.	Zones	d.	Addresses

   11.   _____ is a set of extensions to DNS that adds the capability to authenticate resource records and was designed to protect the Internet from certain attacks.

a.	DNS notify	c.	Hub-and-Spoke topology
b.	DNSSEC	d.	Replication

   12.   _____ is the Microsoft implementation of a NetBIOS name server.

a.	BIND	c.	CNAME
b.	WINS	d.	DNSSEC

   13.   _____ is the process of copying updated data from a data store or file system on a source computer to a matching data store or file system on one or more destination computers to synchronize the data.

a.	DNS notify	c.	Replication
b.	Reverse lookup	d.	Zone transfer

   14.   A(n) _____ is a WINS component that requests replication of updated WINS database entries from its push partner.

a.	Hub-and-Spoke topology	c.	pull partner
b.	BIND	d.	PTR

   15.   The most important step in creating a DNS namespace is _____.

a.	choosing a name	c.	choosing the address
b.	choosing the zone	d.	choosing the pull partner

   16.   _____ zones contain the SOA resource record of the zone, the DNS resource records that list the zone’s authoritative servers, and the glue address resource records that are required for contacting the zone’s authoritative servers.

a.	Recursive	c.	Incremental
b.	Stub	d.	Transfer

YES/NO

     1.   If you are migrating to Windows Server 2003 or integrating Windows Server 2003 DNS with a third-party DNS infrastructure such as BIND or UNIX, do you need to change the namespace design used in your third-party DNS infrastructure?

     2.   Does Windows Server 2003 DNS interoperate with other implementations of DNS?

     3.   Can dynamic DNS updates allow a computer on your network to register and update its DNS resource records whenever a change occurs?

     4.   Can network topology influence your decision about replication frequency?

     5.   Is the Hub-and-Spoke topology best suited for small networks?

COMPLETION

     1.   A(n) ____________________ is a set or group of names that are assigned according to some naming convention.

     2.   For the actual DNS database, a(n) ____________________ is a contiguous portion of the domain tree that is administered as a single separate entity by a DNS server.

     3.   In the ____________________ topology, every WINS server is configured as a replication partner to every other WINS server.

     4.   Active Directory-____________________ zones are the only type of zones that can use multi-master replication and Active Directory security features.

     5.   There are two methods for populating entries in the WINS database: manually and ____________________.

MATCHING

Match each item with a statement below.

a.	Burst handling	f.	Multi-master replication model
b.	Zone transfers	g.	Primary DNS server
c.	DNS zones	h.	DNSSEC
d.	DNS forwarding	i.	Caching-only name server
e.	Conditional forwarders

     1.   Provides fault tolerance by synchronizing the zone file in a primary DNS server with the zone file in a secondary DNS server.

     2.   Used to divide the namespace and use servers to allocate resources and divide services.

     3.   Can be configured to forward DNS queries based on specific domain names.

     4.   Works by adding three additional record types into DNS - NXT, KEY, and SIG - that will be used for authentication.

     5.   The mechanism in which one DNS server passes on an unresolved query to another DNS server for resolution.

     6.   Removes the need for secondary zones when all zones are stored in Active Directory.

     7.   Hosts read-write copies of zone data, has a DNS database of resource records, and resolves queries.

     8.   Performs name resolution using forwarders or root hints.

     9.   Enables WINS to support high volumes of simultaneous WINS client name registration.

       

SHORT ANSWER

     1.   List eight features of Windows Server 2003.

     2.   What are the benefits of Active Directory-integrated zones?

     3.   Describe the conditions under which pull partners and push partners should be used.

     4.   Describe the steps involved in a typical DNSSEC-enabled query.

     5.   What is the advantage and disadvantage of employing the Fully Meshed topology?

 Chapter 7: Service Sizing and Placement

TRUE/FALSE

     1.   The more Group Policy Objects a computer and user need to process at boot and logon, the longer the process will take.

     2.   DCs should always be located in secure sites.

     3.   Domain controllers automatically defragment their local copy of the Active Directory database every 24 hours.

     4.   The sizing of each individual Application Directory Partition can be done precisely.

     5.   The Domain Naming Master role must be assigned to at least two DCs in the forest.

MODIFIED TRUE/FALSE

     1.   Active Directory can be used to store data relating to applications. _________________________

     2.   Each Domain Controller houses a local copy of the Active Directory database. _________________________

     3.   For DCs accessed by fewer than 1000 users, all four (database, logs, operating system, SYSVOL) components can be collocated on the same RAID 5 array. _________________________

     4.   A role should be seized only if the current holder cannot be contacted to transfer the role in a graceful manner. _________________________

     5.   A FSMO role should be seized if the hosting DC is to be made unavailable for an extended period of time. _________________________

MULTIPLE CHOICE

     1.   _____ house the Active Directory database.

a.	Domain Naming Masters	c.	FQDNs
b.	Domain Controllers	d.	Application Directory Partitions

     2.   _____ is a database that is used to store objects that exist within the organization.

a.	FQDN	c.	Dcpromo
b.	Schema	d.	Active Directory

     3.   Which of the following statements is correct?

a.	Size of domain partition in GB = (number of users in domain/1000) * 0.7
b.	Size of domain partition in GB = (1000) * 0.4
c.	Size of domain partition in GB = (number of users in domain/1000) * 0.4
d.	Size of domain partition in GB = (number of users in domain/10) * 0.4

     4.   A(n) _____ can be used to store data pertinent to a particular application.

a.	Application Directory Partition	c.	PDCe
b.	schema	d.	security ID

     5.   Which of the following statements is correct?

a.	If the domain controller requirement is 3.2GB then the global catalog requirement is 6.4GB.
b.	Each DC stores transaction log files relating to the database and a local operating system.
c.	If the number of resource records housed by a server is 100, the RAM requirement is 1MB.
d.	If the number of resource records housed by a server is 1000, the RAM requirement is 5MB.

     6.   Rather than directly provide answers to various questions and thus promote a member server to a DC manually, the process is automated using a(n) _____.

a.	dcpromo answer file	c.	FSMO file
b.	replication file	d.	SYSVOL

     7.   Dcpromo can be executed in the following way _____.

a.	dcpromo /answerfile.txt	c.	dcpromo /answerfile.txt
b.	dcpromo = answer:answerfile.txt	d.	dcpromo /answer:answerfile.txt

     8.   What is the Domain Controller disk space requirement when there are 2000 users per domain?

a.	0.8GB	c.	2.4GB
b.	1.6GB	d.	3.2GB

     9.   Each domain in a forest must have a unique _____.

a.	schema	c.	FQDN
b.	replication file	d.	FSMO

   10.   The DNS representation of the domain name is the _____.

a.	FSMO	c.	dcpromo
b.	FQDN	d.	Active Directory

   11.   It is the job of the _____ to ensure that each domain created has a unique name within the forest.

a.	PDCe	c.	FQDN
b.	Domain Naming Master	d.	PDC

   12.   The _____ exists as a partition within Active Directory and is replicated as a read-only partition to every DC in the forest.

a.	replication file	c.	schema
b.	FQDN	d.	infrastructure master

   13.   When a new security principal is created, it is assigned a unique _____.

a.	DNM	c.	Security ID
b.	FSMO role	d.	PDCe

   14.   The _____ role is responsible for updating the referenced objects whenever changes are made in the source domain.

a.	Infrastructure Master	c.	dcpromo
b.	FSMO	d.	DC

   15.   The _____ role will be housed on the first DC built in the forest, by default.

a.	infrastructure master	c.	Domain Naming Master
b.	FSMO	d.	FQDN

   16.   The _____ role will be housed on the first DC built in each domain in the forest, by default.

a.	FQDN	c.	DNM
b.	PDCe	d.	dcpromo

YES/NO

     1.   Is there an associated replication traffic overhead with every Domain Controller deployed?

     2.   Does Microsoft advise that you place SYSVOL and the database on separate RAID arrays?

     3.   Is the minimum requirement for Logs (DC component) at least 500 MB free space?

     4.   Is the domain controller requirement for 6000 users per domain approximately 1.6GB?

     5.   Is the space requirement for GC servers equivalent to the space requirements of a DC in the same domain?

COMPLETION

     1.   Startup and logon scripts are located in the SYSVOL share, which is replicated using the ____________________ System between each DC in the same domain.

     2.   In order that ADPs can be created and configured, the DC hosting the Domain Naming Master (DNM) FSMO role must first be upgraded to ____________________.

     3.   The most popular approach to promoting servers to become DCs is the ____________________ approach.

     4.   The Active Directory “equivalent” of the Windows NT PDC is the ____________________.

     5.   The ____________________ role will be housed on the first DC built in each domain in the forest, by default.

MATCHING

Match each item with a statement below.

a.	Transfer the role	f.	Active Directory database
b.	FSMO roles	g.	SYSVOL
c.	Domainwide roles	h.	PDCe
d.	Startup and logon scripts	i.	Forestwide roles
e.	Domain Controllers

     1.   Housed on precisely one DC at any one point in time.

     2.   Should be thoroughly tested in an environment that simulates the actual production environment.

     3.   House the Active Directory database.

     4.   Allows at least 500MB free space.

     5.   Used to implement all changes to GPOs, by default.

     6.   Will be transferred to a DC in the same domain, or any DC in the forest if necessary.

     7.   The preferred method of moving FSMO roles from one DC to another.

     8.   Comprised of discrete partitions, or naming contexts.

     9.   Will be transferred to another DC in the same domain.

       

SHORT ANSWER

     1.   When designing service placement, we must take into consideration the actual time to start up. What are the factors that will affect the actual time?

     2.   List the four partitions supported by Windows Server 2003 Active Directory.

     3.   Before commencing with the promotion of a member server into a DC, several checks and best practices should be performed to ascertain whether the server is ready and able to be promoted. List five items on the pre-promotion checklist.

     4.   What is the Active Directory infrastructure requirement for providing a self-sufficient startup and logon?

     5.   What are the functions that should be performed by the designer or architect of an active Directory infrastructure deployment?

 Chapter 8: The Physical Design

TRUE/FALSE

     1.   Using technology embedded in networking hardware, such as virtual LANs (VLNs), you can aggregate individual client connections from many LANs who work together into VLANs.

     2.   Some routers have built-in firewall features to help alleviate having multiple pieces of equipment.

     3.   Every device on each side of a router can broadcast information to other devices on the same subnet.

     4.   A router is designed to better handle network perimeter security than a firewall can and should always be used in a network design.

     5.   You do not need to establish authentication in order to support a secure, remote access solution.

MODIFIED TRUE/FALSE

     1.   Any organization that wants to conduct business over the Internet needs a(n) domain name. _________________________

     2.   Scope options allow you to create default TCP/IP settings to be delivered to the DHCP client when they receive the IP address assignment. _________________________

     3.   A(n) firewall merely reassigns packets based on the address and port without inspecting the type of packet. _________________________

     4.   If you are planning to incorporate more than one RRAS server, then Windows Server 2003 should be configured to use DHCP for authentication purposes. _________________________

     5.   Bus topology is suited for small networks because it does not require the use of a switch or hub. _________________________

MULTIPLE CHOICE

     1.   _____ are mostly used to filter what IP traffic can pass from the Internet to the intranet.

a.	NATs	c.	Subnets
b.	Firewalls	d.	Intranets

     2.   _____ and authentication servers are mostly used for filtering and monitoring what IP traffic flows from the intranet to the Internet.

a.	Proxy servers	c.	Bus topology
b.	Gateways	d.	Subnets

     3.   A(n) _____ is a server that acts on behalf of other servers.

a.	gateway	c.	bus topology
b.	star topology	d.	proxy server

     4.   _____ converts the private IP addresses of an internal addressing schema to one or more public IP addresses for the Internet by altering packet headers to the new address and keeps track of each session.

a.	A firewall	c.	RRAS
b.	RADIUS	d.	NAT

     5.   A(n) _____ is a division of a network into an interconnected, but independent, segment, or domain, in order to improve performance and security.

a.	network perimeter	c.	bandwidth
b.	subnet	d.	firewall

     6.   There is no termination in a(n) _____ topology.

a.	star	c.	NAT
b.	bus	d.	ring

     7.   In a(n) _____ topology, each device is connected centrally to a concentrator.

a.	bus	c.	star
b.	ring	d.	NAT

     8.   Router placement in your network is important in controlling access and _____.

a.	authentication	c.	bandwidth
b.	gateway	d.	scope

     9.   Your _____ will consist of a combination of firewalls, routers, and perhaps, remote access equipment.

a.	network perimeter	c.	bandwidth
b.	scope	d.	gateway

   10.   _____ is an access control protocol that uses a challenge/response method for authentication.

a.	Extranet	c.	Superscope
b.	Intranet	d.	RADIUS

   11.   _____ policies allow you to control connection times, user and group access, connection security, and others.

a.	RRAS	c.	Gateway
b.	RADIUS	d.	Bandwidth

   12.   Windows Server 2003 can support _____ concurrent VPN connections.

a.	1000	c.	2000
b.	1500	d.	3000

   13.   A(n) _____ is a point of access from one network to another.

a.	scope	c.	gateway
b.	NAT	d.	packet

   14.   _____ are devices that are used to aggregate network connections from workstations and to connect different network segments within the same physical network.

a.	Routers	c.	Scope options
b.	Switches and hubs	d.	Superscopes

   15.   _____ are a grouping of scopes to support a particular subnet.

a.	Megascopes	c.	Superscopes
b.	Gateways	d.	Packets

   16.   _____ contains ranges of IP addresses that can be used on an internal network.

a.	RFC 1918	c.	RFC 19200
b.	RFC 1900	d.	RFC 1823

YES/NO

     1.   Is DHCP a client/server process?

     2.   Can superscopes use noncontiguous IP address ranges?

     3.   Can you use encryption with dial-on-demand?

     4.   Are superscopes normally used in networks with only one DHCP server?

     5.   Is the use of one DHCP server sufficient to provide fault tolerance?

COMPLETION

     1.   A(n) ____________________ is an internal Web environment that serves an organization’s personnel and is generally not accessible to the public.

     2.   A(n) ____________________ is a means of selectively extending an organization’s intranet to individuals and organizations through the Internet who are not physically connected to the organization’s network.

     3.   A(n) ____________________ is a network segment between an organization’s trusted internal network and an untrusted external network such as the Internet.

     4.   ____________________ topology uses an open-ended cable in which all network devices are connected.

     5.   A(n) ____________________ is a range of IP addresses that will be used by a subnet to assign needed IP addresses.

MATCHING

Match each item with a statement below.

a.	Proxy server
b.	Perimeter defenses
c.	Subnet
d.	DHCP
e.	Router
f.	Firewall
g.	RRAS policies
h.	Dial-on-demand
i.	Microsoft Internet Security and Acceleration Server

     1.   Operates as a relay agent between the client and server.

     2.   First line of defense against the Internet.

     3.   Can filter by MAC address, IP address, TCP and UDP port, and protocol.

     4.   Consist of devices and software that sit at the edge of your network.

     5.   Suitable for use as a firewall and a proxy server.

     6.   Enables the use of asynchronous telephone lines, cable, and DSL.

     7.   Allow you to control how you want clients to connect to your organization’s network.

     8.   A way of taking a complete network and reducing it to manageable and optimized chunks.

     9.   Provides automatic TCP/IP addressing.

       

SHORT ANSWER

     1.   What are the four levels for defining scope options or TCP/IP options on a DHCP server?

     2.   What are the issues involved when designing router placement?

     3.   What are some common questions that need to be asked when designing a remote access infrastructure?

     4.   What are the components of a physical topology?

     5.   Availability and failover go hand-in-hand. To ensure availability, you need to provide the means for failover. How is this accomplished?

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