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Date: Wed, 19 May 2010 Time: 2:00 AM -
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Understanding how sites and replication work is a prerequisite for being able to configure and manage sites and replication for Active Directory. This lesson introduces you to how sites and replication work to represent the physical structure of Active Directory.
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Understanding how sites and replication work is a prerequisite for being able to configure and manage sites and replication for Active Directory. This lesson introduces you to how sites and replication work to represent the physical structure of Active Directory.
After this lesson, you will be able to
Explain the purpose of sites
Explain how information is replicated within sites and between sites
Explain the purpose of site links, site link bridges, and bridgehead servers
Explain site link transitivity
Estimated lesson time: 20 minutes
Understanding Sites
Recall from Chapter 1, "Introduction to Active Directory," that a site is a set of Internet Protocol (IP) subnets connected by a highly reliable and fast link, usually a local area network (LAN). A subnet is a subdivision of an IP network. Typically, networks with a bandwidth of at least 512 kilobits per second (Kbps) are considered fast networks. An available bandwidth of 128 Kbps and higher is sufficient for designating a site. Available bandwidth is the amount of bandwidth that is actually available for use during peak traffic after normal network traffic is handled.
In Active Directory, site structure mirrors the location of user communities. Site structure corresponds to the physical environment and is maintained separately from the logical environment, which is represented by the domain structure. Because sites are independent of the domain structure, a single domain can include a single site or multiple sites, and a single site can include multiple domains.
The main purpose of a site is to physically group computers to optimize network traffic. Sites act to confine authentication and replication traffic to only the devices within a site. Because network traffic is prevented from unnecessarily crossing slow wide area network (WAN) links, WAN traffic is limited. Sites have two main roles:
To facilitate authentication, by determining the nearest domain controller when a
user logs on from a workstation
To facilitate the replication of data between sites
Because site names are used in the records registered in the Domain Name System (DNS) by the domain locator, they must be valid DNS names. Recall that valid DNS names consist of the standard characters A-Z, a-z, 0-9, and hyphen (-).
CompTIA,CompTIA Exam,CompTIA Certification
drive from http://www.aplus-220-602.com.Understanding how sites and replication work is a prerequisite for being able to configure and manage sites and replication for Active Directory. This lesson introduces you to how sites and replication work to represent the physical structure of Active Directory.220-602
CompTIA Exam.
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