s. Answer the following questions concerning Chapter 10. 10.1 What does DNS do?
ID: 3710033 • Letter: S
Question
s. Answer the following questions concerning Chapter 10. 10.1 What does DNS do? MAC address IP address a. Given an IP address, it returns the corresponding b. Given a MAC address, it returns the corresponding c. Given a name, it returns the corresponding protocol d. Given a name, it returns the corresponding IP port address 10.2 Which of the following would confirm that you have a DNS problem? A. PING returns a "request timed out" message B. PING works with the IP address but not with the name C. PING does not work with either an IP address or a Web site address D. PING works with both an IP address and a Web site address 10.3 What is the authoritative DNS (Domain Name System) server for NJIT? a The root name server b. The .edu name b. The most local I name server to the client d. NJIT's name server 10.4 You type in the URL http://www.mycorp.com into your web browser. Your operating system sends a DNS request to your local DNS server. However, your DNS server does not know the corresponding IP address. What happens next? a. The local DNS server will answer from its cache b. The local DNS server will report failure and your browser will display an error message c. The local DNS server will ask other servers, probably including the authoritative server for the mycorp.com domain, until it finds the answer d. The local DNS server will ask a root server, which knows all possible name-IP pairs . Answer the following questions concerning names: a. What is one functional top level domain? b. What is one geographical top level domain?Explanation / Answer
5)
10.1)
What does DNS do?
D) Given a name, it returns the corresponding ip address
DNS servers return the IP address of the Web server associated with that name.
10.2)
C)
DNS error is usually an early warning that you've completely lost network or Internet access. This error indicates that you've been unable to look up the IP address for a domain that you're trying to access.
10.3)
B) NJIT is a education institution it is used .edu name server
10.4)
D) Many website URLs we encounter today contain a third-level domain, a second-level domain, and a top-level domain. Each of these levels contains their own name server which is queried during the DNS lookup process.
For maps.mycorp.com, first, the DNS recursor will contact the root name server. The root name server will redirect it to .com domain name server. .com name server will redirect it to mycorp.com name server. mycorp.com name server will find the matching IP address for maps.mycorp.com in its’ DNS records and return it to your DNS recursor which will send it back to your browser.
6)
a)
A top-level domain (TLD) is the last segment of the domain name. The TLD is the letters immediately following the final dot in an Internet address. A TLD identifies something about the website associated with it, such as its purpose, the organization that owns it or the geographical area where it originates. Each TLD has a separate registry managed by a designated organization under the direction of the Internet Corporation for Assigned Names and Numbers (ICANN).
ICANN identifies the following categories of TLDs:
Country-code top-level domains (ccTLD) -- Each ccTLD identifies a particular country and is two letters long. The ccTLD for the United States, for example, is .us
Infrastructure top-level domain -- There is only one TLD in this group, ARPA (Address and Routing Parameter Area). The Internet Assigned Numbers Authority (IANA) manages this TLD for the IETF.
Sponsored top-level domains (sTLD): These are overseen by private organizations.
Generic top-level domains (gTLD) -- These are the most common and familiar TLDs. Examples include "com" for "commercial" and "edu" for "educational." Most gTLDs are open for registration by anyone, but there is also a subgroup that is more strictly controlled.
b)
A Geo TLD is a top level domain name category created by ICANN denoting geographical, geopolitical, ethnic, social or cultural representation. Currently, .asia (represents the Asian continent), .cat (represents the Catalan language) and .eu (represents the countries in the European Union) are considered geo TLDs. Wherein .berlin, .cat, .nyc and .paris were presented as examples of top level domain names under this category.
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