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Free 312-50 Exam Braindumps (page: 38)

Page 37 of 191
PDF with 765 Questions

You have the SOA presented below in your Zone. Your secondary servers have not been able to contact your primary server to synchronize information. How long will the secondary servers attempt to contact the primary server before it considers that zone is dead and stops responding to queries?
collegae.edu.SOA, cikkye.edu ipad.college.edu. (200302028 3600 3600 604800 3600)

  1. One day
  2. One hour
  3. One week
  4. One month

Answer(s): C

Explanation:

The numbers represents the following values:

200302028; se = serial number
3600; ref = refresh = 1h
3600; ret = update retry = 1h
604800; ex = expiry = 1w
3600; min = minimum TTL = 1h



Sara is using the nslookup command to craft queries to list all DNS information (such as Name Servers, host names, MX records, CNAME records, glue records (delegation for child Domains), zone serial number, TimeToLive (TTL) records, etc) for a Domain. What do you think Sara is trying to accomplish? Select the best answer.

  1. A zone harvesting
  2. A zone transfer
  3. A zone update
  4. A zone estimate

Answer(s): B

Explanation:

The zone transfer is the method a secondary DNS server uses to update its information from the primary DNS server. DNS servers within a domain are organized using a master-slave method where the slaves get updated DNS information from the master DNS. One should configure the master DNS server to allow zone transfers only from secondary (slave) DNS servers but this is often not implemented. By connecting to a specific DNS server and successfully issuing the ls –d domain-name > file-name you have initiated a zone transfer.



A zone file consists of which of the following Resource Records (RRs)?

  1. DNS, NS, AXFR, and MX records
  2. DNS, NS, PTR, and MX records
  3. SOA, NS, AXFR, and MX records
  4. SOA, NS, A, and MX records

Answer(s): D

Explanation:

The zone file typically contains the following records:
SOA – Start Of Authority
NS – Name Server record
MX – Mail eXchange record
A – Address record



Let's imagine three companies (A, B and C), all competing in a challenging global environment. Company A and B are working together in developing a product that will generate a major competitive advantage for them. Company A has a secure DNS server while company B has a DNS server vulnerable to spoofing. With a spoofing attack on the

DNS server of company B, company C gains access to outgoing e-mails from company B. How do you prevent DNS spoofing? (Select the Best Answer.)

  1. Install DNS logger and track vulnerable packets
  2. Disable DNS timeouts
  3. Install DNS Anti-spoofing
  4. Disable DNS Zone Transfer

Answer(s): C

Explanation:

Explantion: Implement DNS Anit-Spoofing measures to prevent DNS Cache Pollution to occur.






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