Exam 70-741 topic 2 question 23 discussion

I have explanation for the answer is D. The question says to minimize zone replication traffic. Delegation does not need any replication and delegation is used for child domains only. Stub zone needs partial replication and it often used for different domains/forest. Secondary zone needs full replication. Now those who prefer stub zones, kindly note that if IP address of DNS server changes, it will not update the stub zone, because IP address needs to be put manually. The question says that DNS servers are reconfigured often, it means that research.contoso.com are adding, removing and making changes in the DNS server, not changing the IP address of DNS server. Because if IP address is changed then delegation and stub zone both will fail to resolve queries. The moral of the story: research.contoso.com is a child domain and minimum replication is required so the best option is answer D.

i would also go with C here: the state that the Nameservers often change ... so with a delegation you would need manual updates. Stub Zones are updated automatically. And you need to minimize replication traffic ... so a secondary zone ist also out https://docs.infoblox.com/display/NAG8/Configuring+Delegated%2C+Forward%2C+and+Stub+Zones stub zone contains records that identify the authoritative name servers in the zone. It does not contain resource records for resolving IP addresses to hosts in the zone. Instead, it contains the following records: SOA (Start of Authority) record of the zone NS (name server) records at the apex of the stub zone A (Address) records that map the name servers to their IP addresses

I think D is correct. Because delegated zone needs to replicate zone record.

I am completely sure the answer is D) Create a delegation for research.contoso.com Delegation: Usually between a parent domain and a child domain You own contoso.com zone. Next morning your company opens a branch office in Argentina. The domain for the branch office will be ar.contoso.com and you want the network admins in Argentina to manage that domain. -> Delegate ar.contoso.com to the DNS servers in Argentina, where the network admins have full control of the zone. Stub zones: Usually between different domains Contoso.com and techexams.net do a jointventure. techexams.net modifies its NS servers often and they also add new ones. Your least administrative effort solution to provide a quick resolution of techexams.net is to create a stub zone that points to one of their dns. The stub zone reads the NS records of the other domain and keeps that updated. In the question has: 1) A parent domain and a child domain: contoso.com and research.contoso.com 2) The solution must minimize zone replication traffic: The stub zone reads the NS records of the other domain and keeps their records updated, but you need to minimize the DNS traffic so stub zone is discarded.

The Answer is D, not C. research is a subdomain of a zone you already manage, not a separate zone. Stub Zones are for separate zones, not subdomains, but are nearly identical in operation.

This is C - stub zone. The key is in the words 'reconfigured often'. That is prefectly suited to stub zones. Delegation will be broken if IP addresses change on remote NS.

From my point of view its C since: "The DNS servers in a child domain named research.contoso.com are reconfigured OFTEN" and the main disadvantage of delegation is: " The NS records created by the Delegation point at SPECIFIC name servers by IP address. If an administrator in the child domain changes those IP addresses, or renames the DNS servers, or decommissions a server, this creates a lame delegation." while stub: "refreshes the NS list periodically to stay up to date with the current list of name servers for the specified zone" https://redmondmag.com/articles/2004/01/01/the-long-and-short-of-stub-zones.aspx

"You are not responsible for managing DNS for the child domains." ---> Delegation. Answer D.

D. Create a delegation for research.contoso.com

A stub zone in DNS is a feature that first appeared in Windows 2003. Its primary use is to boost classic zone delegation. The way this used to be done before the introduction of stub zones is to use delegation. This means creating NS records in the parent domain ab.com in this case) that identifies DNS servers in the child domain (child.abc.com). The problem with this is that the Delegation Wizard will create name server records that point to a specific NS by IP address. A stub zone fixes this problem by creating a new zone with not just the records for the given zone, but all NS records for that zone as well.

C looks right

Answer = D I base my answer on information in the link posted below. With delegation no copy of the zone is kept on the parent server so no replication traffic. https://social.technet.microsoft.com/Forums/windows/en-US/7d58ec09-3f8a-475d-b935-ebb97dc0d8ff/dns-zone-delegation?forum=winserveripamdhcpdns

C is correct answer

C or D?

ahhhh :(( which is right

The solution must minimize zone replication traffic. therefore B is correct answer, secondary Zone copy only update record from the primary zone only. there fore the replication traffic is very minimal. Im with you Mr. River

Anyone is sure about the right answer? Any explanations please?