HOTSPOT
Your network contains one Active Directory forest named adatum.com. The forest contains a single
domain.
The forest contains the domain controllers configured as shown in the following table.
Recently, a domain controller named DC4 was deployed to adatum.com. DC4 is in the Default-FirstSite-Name site.
The adatum.com site links are configured as follows.
The schedule for SiteLink1 is shown in the SiteLink1 exhibit. (Click the Exhibit button.)
The schedule for SiteLink2 is shown in the SiteLink2 exhibit. (Click the Exhibit button.)
For each of the following statements, select Yes if the statement is true. Otherwise, select No.
Answer: 
Explanation:
* SiteLink1 replication is not available at 10:00.
* SiteLink1 and SiteLink2 replication is available at Friday at 23:00. Replication intervals are 15
minutes and 30 minutes respectively.
* DefaultIPSitelink will be used to replicate an object from DC1 to DC4. The replication interval of
DefaultIPSitelink is 180 minutes.
This exact question was on my 70-412 exam.
Provided answer is wrong. The last one sentence, should be answered NO. It is because DEFAULTFIRSTSITELINK, as you can see is containing only one site: Default-FirstSite-Name. In effect it will not transport any data to any other sites. Additionally any other Inter Site Link showed on exhibit does not contain Default-FirstSite-Name site. DC in site without connection with others will not share its data.
In my opinion, correct answers are: N, Y, N.
And additionally, link bridging does not change the matter. It is because link bridging will work only if link to bridge connects at last two different sites. If not KDC will not be able to evaluate costs.
mist74 says:
March 21, 2016 at 12:01 pm
“A site link bridge connects two or more site links and enables transitivity between site links. Each site link in a bridge MUST have a site in common with another site link in the bridge. The Knowledge Consistency Checker (KCC) uses the information on each site link to compute the cost of replication between sites in one site link and sites in the other site links of the bridge. Without the presence of a common site between site links, the KCC also cannot establish direct connections between domain controllers in the sites that are connected by the same site link bridge.”
https://technet.microsoft.com/en-us/library/cc753638(v=ws.10).aspx
excellent work mist74
Kevin says:
December 3, 2015 at 5:33 pm
Correct me if I’m wrong, but I thought site link bridging wouldn’t connect sites that are in no way related. Seeing how the default site and default link are in no direct or indirect way linked to sites 1, 2 and 3 or sitelinks 1 and 2, there is simply nothing to bridge.
Answer is
N
Y
N
DC4 cannot contact any other DC