Computer Sciences and Information Technology
\nTopic:
\nDNS and DNS tools questions
\n1. Define the following and provide an example:
\n(a) Root DNS Server
\n(b) Top Level Domain Name servers
\n(c) Default Name Server<\/p>\n
2. Define the following and provide an example:
\n(a) Authoritative Domain Name Servers \u2013 Primary and Secondary.
\n(b) Master Name Server
\n(c) Slave Name Server<\/p>\n
3. In the context of DNS
\n(a) What are the Resource Records, RR.
\n(b) What are the DNS Resolvers and where are they located?
\n(c) In the context of the RR, what is the time to live, TTL?<\/p>\n
4. The Wi-Fi routers are expected to have a DNS Relay.
\nWhat is it? What does it do?<\/p>\n
5. Describe the meaning of the following two Resource Records:
\n(a) (abc.com, 123.45.67.89, A , 9hours)
\n(b) (xyz.net, 89.67.45.123, MX)<\/p>\n
6. From the RFC 1035 (www.ietf.org\/rfc\/rfc1035.txt) describe the RR format.<\/p>\n
7. Go to www.misk.com\/tools and enter the domain name of your choice.
\nReview the information provided by selecting DNSLOOKUP, WHOIS, and TRACEROUTE. What have you learned?<\/p>\n
8. Your PC has been suspiciously pinged from IP address 91.140.0.140. Using tools that are freely available in the Web, learn as much as possible about that IP address (Domain name, physical location, owner, address, etc.)<\/p>\n
1.\tDefine the following and provide an example:
\n(a)\tRoot DNS Server
\nRoot DNS servers are the authoritative names of the servers that serve the root servers which are also called the DNS root zone. Example is a.root-servers.net as the host name and 198.41.0.4.2003.465.ba4ee:: 2:40 Apple, Inc.
\n(b)\tTop Level Domain Name servers
\nThe Top Domain Name Servers is defined as the highest levels among the domain names which are located in the DNS root zone. Examples are com, org, net, gov, edu among others.
\n(c)\tDefault Name Server
\nThe Default Name Sever is used to automatically set new domain registrations to the name server which is chosen. An example is ns1.domain.com.
\n2.\tDefine the following and provide an example:
\n(a) Authoritative Domain Name Servers \u2013 Primary and Secondary.
\nAuthoritative domain server provides answers to the queries that are raised by DNS which includes the website IP address, mail server among others. It houses the primary name server which keeps records of the original copies of zone records and the secondary name server which is dependent on the primary server. Examples are AAAA, SOA, MX, and PTR among others.
\n(b) Master Name Server
\nMaster Name Server stores the original copies for all the zone records. The changes are only made on the records stored in the master zone records. Exampls are SOA, MX among others<\/p>\n
(c) Slave Name Server
\nSupports the master server and may replace it when it is not functioning well. It reduces the DNS server load from the primary name server. Example is sec.example.com<\/p>\n
3.\tIn the context of DNS
\n(a)\tWhat are the Resource Records, RR.
\nRRs are the foundation of building the host-name and IP addresses. In additions, all the issues that concern the DNS are resolved by RR. They exist in different formats and data.<\/p>\n
(b)\tWhat are the DNS Resolvers and where are they located?
\nDNS resolvers are used to convert the Web links to IP address and therefore provide linkage between the computer and DNS infrastructure. They are located in the Internet Service Providers.<\/p>\n
(c)\tIn the context of the RR, what is the time to live, TTL?
\nTTL is the period of time in seconds that the resolver catches any record. Zero seconds is an indication that no record should be cached.<\/p>\n
4.\tThe Wi-Fi routers are expected to have a DNS Relay.
\nWhat is it? What does it do?
\nDNS relays is a situation whereby a number of machines send the DNS queries to the relay. It is used to send and receive the answers to the machines and store queries for a short time.
\n5.\tDescribe the meaning of the following two Resource Records:
\n(a)\t(abc.com, 123.45.67.89, A , 9hours)
\nHosts address (A) resource record and Maps domain name (abc.com) to an internet IP address 123.45.67.89 for 9 hours.
\n(b)\t(xyz.net, 89.67.45.123, MX)
\nHost Master Name server and maps the domain name xyz.net to an internet of IP address 123.45.67.89.<\/p>\n
6.\tFrom the RFC 1035 (www.ietf.org\/rfc\/rfc1035.txt) describe the RR format.
\nThe format is used to describe the registration by organisations to administer the high level domains and delegate to the subzones. It, therefore, contains the authoritative name server if it is not known, maps and returns it to the local name server.<\/p>\n
7.\tGo to www.misk.com\/tools and enter the domain name of your choice.
\nReview the information provided by selecting DNSLOOKUP, WHOIS, and TRACEROUTE. What have you learned?
\nThe tool provides means to view specific DNS, the ownership and the path where it is located.<\/p>\n
8.\tYour PC has been suspiciously pinged from IP address 91.140.0.140. Using tools that are freely available in the Web, learn as much as possible about that IP address (Domain name, physical location, owner, address, etc.)
\nThe owner of the address is Wind Hellas Telecommunications located in Athens Greece and hostname is adsl-140.91.140.0.tellas.gr and domain name www.windhellastelecommunications.com.<\/p>\n","protected":false},"excerpt":{"rendered":"
Computer Sciences and Information Technology Topic: DNS and DNS tools questions 1. Define the following and provide an example: (a) Root DNS Server (b) Top Level Domain Name […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6967],"tags":[6981,613,6983,3959],"class_list":["post-48336","post","type-post","status-publish","format-standard","hentry","category-writing-my-dissertation-in-a-day","tag-uk-best-nursing-assignment-writing-service-for-students","tag-best-dissertation-writing-services-uk","tag-help-with-dissertation-writing-london","tag-best-dissertation-writing-service-uk"],"_links":{"self":[{"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/posts\/48336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/comments?post=48336"}],"version-history":[{"count":0,"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/posts\/48336\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/media?parent=48336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/categories?post=48336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homeworkacetutors.com\/assessments\/wp-json\/wp\/v2\/tags?post=48336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}