Take the quiz (either here or use the PTP software) if you want to use the score to help you decide how much time to spend onthis chapter. Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes,” found at the end of the book, includes both the answers and explanations. You can also find answers in the PTP testing software.
Table 16-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping
The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark that question as wrong for purposes of the self-assessment.
Giving yourself credit for an answer you incorrectly guess skews your self-assessment results and might provide you with a false sense of security.
1. A recursive server processes domains names
a. From the left to the right because sections to the left contain sections to the right.
b. From the right to the left because more specific information is on the right.
c. From the right to the left because sections to the right contain sections to the left.
d. From the left to the right because less specific information is on the left.
2. What can domain names represent? (Select all that apply.)
a. An organization
b. A topological location on the Internet
c. A service
d. A piece of information
e. A physical server
3. Domain names can be translated to which of the following?
a. IP addresses
b. IP addresses or services
c. IP addresses, services, or topological network locations
d. IP addresses, services, or other pieces of network naming information
4. What kind of DNS server does a host query to resolve a domain name?
a. Root
c. TLD
d. Authoritative
5. A root DNS server will return the following:
a. The correct TLD server to ask about a domain name
b. The correct authoritative server to ask about a domain name
c. The IP address of the host with the requested server
d. The physical location of the requested server
6. How long will information about a domain name be cached once resolved?
a. Until the responding server indicates the information has changed
b. Until the recursive server has responded and the information is no longer needed
c. Until the time-to-live times out
d. Until a timer local to the server expires
7. What are A and AAAA DNS records?
a. IPv4 addresses
b. IPv6 addresses
c. IPv4 and IPv6 addresses
d. The geographic location of the server
8. What information does a DNS root server provide?
a. It accepts the initial query and recurses through the domain to find the corresponding IP address.
b. It indicates which top-level domain (TLD) server to ask about a given domain.
c. It provides the correct authoritative server to ask about a domain.
d. It authoritatively maps a domain name to an IP address.
9. What is the primary objective of a DNS cache poisoning attack?
a. To prevent a user from reaching a service
b. To observe a user’s browsing habits
c. To misdirect a user to the attacker’s web server
d. To uncover an organization’s internal DNS structure
10. What is the difference between tracing and resolving a domain name?
a. These are two names for the same thing.
b. Tracing the domain name shows every query, while resolving the domain name shows only the results.
c. Tracing the domain name shows only the results, while resolving the domain name shows every query.
d. Servers can trace domain names, while hosts can only resolve domain names.
11. What is a stratum 0 device in Network Time Protocol?
a. A server with a specialized clock module
b. A device with physical access to a highly accurate clock
c. A service getting time from a higher-stratum device
d. A server farthest away from a highly accurate clock Foundation Topics