DNS

Question 1

1. HOSTS file

Answer 1

Not dynamic text file which provides a local method for resolution of host names

Question 2

2. DNS Resolver Cache

Answer 2

• Speed up DNS queries and reduce network traffic

* Contains host file data, positive query results and fail attempts

Question 3

3. DNS Zone

Answer 3

• Collection of resource records for a contiguous portion of the DNS namespace
• A zone is a portion of the DNS database
• Zones are stored on DNS servers or in an AD database
• A server that hosts a zone for a domain is authoritative for that domain

Question 4

4. DNS Caching

Answer 4

Provides faster query response and reduces DNS tfc

Question 5

5. • 6. (Conditional) Forwarder

Answer 5

• DNS server to resolve external of offsite DNS domains
• Central forwarder => internet name resolution
• Conditional forwarder => multiple internal namespaces

Question 6

7. • 8. Root hints

Answer 6

DNS resource records (stored on a DNS server) that list the IP addresses for the DNS root servers

Question 7

9. Top-level domain-name

Answer 7

• Rightmost portion of a domain name

* Usually 2 or 3 character name code => ID organizational or geographical status for the domain name

Question 8

10. Second-level domain-name

Answer 8

Unique name formally registered to an individual or organization that connects to the internet