Computer Networks: Application Layer II (DNS)

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12 Questions

What is the process called when the primary server downloads information from the secondary server?

Zone Transfer

Which server is commonly used as the DNS server and runs under UNIX as a process called named?


What does the 'nslookup' command do in the context of DNS?

Translates domain names to IP addresses

What happens in recursive name resolution?

The client sequentially sends queries to DNS servers

What is the purpose of a BIND server in the context of DNS?

To perform zone transfers between DNS servers

In the name resolution process, what is recursive resolution?

A resolution process where a DNS server fully answers a client's query without referring it to other servers

What function does DNS serve in the context of the Internet?

Translating domain names to IP addresses for routing on the Internet

What is the purpose of zone transfer in DNS?

Copying DNS database information from one server to another

What happens if a domain name does not end in a dot according to the text?

The DNS resolver may complete it by appending a suffix.

How are generic top-level domains (gTLDs) characterized in terms of length according to the text?

They can be three characters or more in length.

What is the responsibility of individual DNS servers in relation to zones according to the text?

DNS servers are responsible for specific zones.

How many DNS servers typically serve each domain name for redundancy according to the text?

Each domain name is typically served by 2 or more DNS servers for redundancy.

Study Notes

  • DNS, or Domain Name System, is a global database system for Internet addressing, mail, and other information.
  • DNS uses a hierarchical tree-like structure for domain names, with domains arranged in a tree-like structure.
  • Fully qualified domain names (FQDNs) are complete domain names that end in a dot.
  • DNS servers translate domain names to IP addresses.
  • DNS uses a concept of domains and sub-domains, with domain management distributed.
  • Top-level domains include commercial (com), organizational (org), network service provider (net), US government (gov), military (mil), education (edu), Australian (au), Austrian (at), Canadian (ca), Danish (dk), Dutch (nl), Indian (in), Italian (it), Japanese (jp), Korean (kr), New Zealand (nz), Spanish (es), Taiwanese (tw), UK (uk), and US (us).
  • DNS uses a name resolution process to translate a fully qualified domain name into the corresponding IP address.
  • Clients use the "nslookup" command to query DNS servers for information.
  • DNS servers can be configured with secondary servers for redundancy, and each host may also have one or more secondary name servers.
  • DNS uses a hierarchy of name servers, with root servers at the top and specific servers for different domains.
  • DNS uses recursive and iterative name resolution.
  • DNS uses a concept of zones, with domains broken into zones for which individual DNS servers are responsible.
  • Primary DNS servers contain the master copy of the data for a zone, while secondary servers contain copies of this data.

Test your knowledge about the Domain Name System (DNS) and other application layer protocols in computer networks. Learn about DNS, FTP, HTTP, SMTP, SNMP, Telnet, and more.

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