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What are the differences between Windows Clustering, Network Load Balancing
and Round Robin, and scenarios for each use?
Cluster technologies are becoming increasingly important to ensure service
offerings meet the requirements of the enterprise. Windows 2000 and Windows
Server 2003 support three cluster technologies to provide high availability, reliability
and scalability. These technologies are: NLB, CLB and Server cluster.
These technologies have a specific purpose and are designed to meet different
requirements. • Server cluster provides failover support for applications and
services that require high availability, scalability and reliability, and is ideally suited
for back-end applications and services, such as database servers. Server cluster
can use various combinations of active and passive nodes to provide failover support
for mission critical applications and services. • NLB provides failover support for
IP-based applications and services that require high scalability and availability,
and is ideally suited for Web tier and front-end services. NLB clusters can use
multiple adapters and different broadcast methods to assist in the load balancing of
TCP, UDP and GRE traffic requests.

• Component Load Balancing provides dynamic load balancing of middle-tier
application components that use COM+ and is ideally suited for application servers.
CLB clusters use two clusters. The routing cluster can be configured as a routing list
on the front-end Web servers or as separate servers that run Server cluster.
Cluster technologies by themselves are not enough to ensure that high availability
goals can be met. Multiple physical locations may be necessary to guard against
natural disasters and other events that may cause complete service outage.
Effective processes and procedures, in addition to good architecture, are the
keys to high availability. Round robin is a local balancing mechanism used by DNS
servers to share and distribute network resource loads. You can use it to rotate
all resource record (RR) types contained in a query answer if multiple RRs are found.
By default, DNS uses round robin to rotate the order of RR data returned in query
answers where multiple RRs of the same type exist for a queried DNS domain name.
This feature provides a simple method for load balancing client use of Web
servers and other frequently queried multihomed computers. If round robin is
disabled for a DNS server, the order of the response for these queries is based
on a static ordering of RRs in the answer list as they are stored in the zone
(either its zone file or Active Directory).

How do I clear the DNS cache on the DNS server?
To clear DNS Cache do the following:
1. Start
2. Run
3. Type "cmd" and press enter
4. In the command window type "ipconfig /flushdns"
5. If done correctly it should say "Successfully flushed the DNS Resolver Cache."

For Question & Answer on DHCP and Its process etc.  click here

For Question & Answer on IP Address,
Subnet Mask, ARP etc.  click here

For Question & Answer on DNS, DNS Zones etc.  click here

For Question & Answer on DNS, DNS Zones and AD etc. click here

For Question & Answer on Windows Clustering , NLB, WINS click here

For Question & Answer on IAS & RAS, PAT, NAT, VPN  click here

For Question & Answer on Domain, DC, Active Directory and its features etc. click here

For Question & Answer on LDAP,AD- Structure & Namespace etc. click here

For Question & Answer on Application Partition, DC- Backup, Sysvol etc. click here

For Question & Answer on Recovery/Restore of DC & GC  etc. click here

For Question & Answer on Global Catalog, REPLMON. LDP, ADSIEDIT etc. click here

For Question & Answer on Netdom, Sites, KCC, ISTG  etc. click here

For Question & Answer on FSMO and its roles  etc. click here

For Question & Answer on Active Directory (AD) & its backup   etc. click here

For Question & Answer on GPO, GPC and GPT etc. click here

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