Question 2During the name resolution process, which server does a local recursive server contact first? 1 pointCaching name serverTop level domain (TLD) serverRoot name serverAuthoritative name server

2.4-02. DNS: time to resolve query.  Suppose that the local DNS server caches all information coming in from all root, TLD, and authoritative DNS servers for 20 time units. (Thus, for example, when a root server returns the name and address of a TLD server for .com, the cache remembers that this is the TLD server to use to resolve a .com name).  Assume also that the local cache is initially empty, that iterative DNS queries are always used, that DNS requests are just for name-to-IP-address translation, that 1 time unit is needed for each server-to-server or host-to-server (one way) request or response, and that there is only one authoritative name server (each) for any .edu or .com domain.Consider the following DNS requests, made by the local host at the given times:t=0, the local host requests that the name gaia.cs.umass.edu be resolved to an IP address. t=1, the local host requests that the name web.cs.umass.edu be resolved to an IP addressHow many time units are needed for the DNS request made at t=1 to be resolved?Group of answer choices6 time units.8 time units.4 time units.2 time units.10 time units.

3. Define DNS and explain in detail about the domain hierarchy and name server.

Which of the following are central directories that list all domain names currently in use for specific domains?Question 15Answera.client serversb.web serversc.DNS serversd.root servers

Question 6Most public Domain Name Servers (DNS) are available globally through which technology?1 pointTime To Live (TTL) fieldHost file Echo request Anycast

What specific TCP/IP protocol enables a specific type of server to resolve (translate) domain and computer names to IP addresses or IP addresses to domain and computer names?Group of answer choicesDHCPDNSAPIPAWINS