640-802 dumps,VCP-310 and 350-001 testking

You need to design a domain name resolution strategy for IT Training Institute
users in London.
350-001
You need to ensure that your solution meets the business and
technical requirements of IT Training Institute.

What should you do? (Each correct answer presents a complete solution. Choose
THREE.)

A. Create a root zone on the DNS server in London.
B. Configure default root hints on the DNS server in London.
C. Configure the DNS server in London to forward all request for the external namespace
to IT-DC03.
D. Configure recursion on the DNS server in London.
E. Create a stub zone for the external namespace on the DNS server in London.
Answer: B, C, E
Explanation:
Leading the way in IT testing and certification tools, www.certifyme.com
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To perform recursion properly, the DNS server first needs to know where to begin
searching for names in the DNS domain namespace.640-802 This information is provided in
the form of root hints, a list of preliminary resource records used by the DNS
service to locate servers authoritative for the root of the DNS domain namespace
tree.

A common use of forwarding is to allow DNS clients and servers inside a firewall to
resolve external names securely.
VCP-310 When an internal DNS server or client communicates
with external DNS servers by making iterative queries, normally the ports used for DNS
communication with all external servers must be left open to the outside world through
the firewall. However, by configuring a DNS server inside a firewall to forward external
queries to a single DNS forwarder outside your firewall, and by then opening ports only
to this one forwarder, you can resolve names without exposing your network to outside
servers.

A stub zone is a copy of a zone that contains only the resource records needed to identify
an authoritative DNS server. An authoritative DNS server is a server that hosts resource
records for a particular DNS zone. Rather than a DNS server having to query the Internet
to locate an authoritative DNS server, the DNS server can simply refer to the list of name
servers (NS resource records) in the stub zone. Distributing a list of authoritative DNS
servers for a zone can be implemented by using stub zones. Unlike secondary zones,
which primarily are used for redundancy and load-balancing reasons, stub zones are used
to improve name resolution performance.

Incorrect Answers:
A: A root zone will not allow DNS to resolve names on the external network.
D: You could enable recursion on the internal DNS server but a technical requirement is
that you minimize DNS traffic.

Reference:
J. C. Mackin, and Ian McLean: MCSA/MCSE self-paced training kit (exam 70-291):
Implementing, managing, and maintaining a Microsoft Windows Server 2003 network
infrastructure, Microsoft, Chapter 4, pp. 4-19, and Chapter 5, pp. 5-6.
Walter Glenn, and Michael T. Simpson; MCSE 70-297 Training Kit - Designing a
Windows server 2003 Active Directory and Network Infrastructure, Chapter 6, pp. 6-26.

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