Laptop Sciences and Data Expertise
Subject:
DNS and DNS tools questions
1. Outline the next and present an instance:
(a) Root DNS Server
(b) High Stage Area Identify servers
(c) Default Identify Server
2. Outline the next and present an instance:
(a) Authoritative Area Identify Servers – Main and Secondary.
(b) Grasp Identify Server
(c) Slave Identify Server
three. Within the context of DNS
(a) What are the Useful resource Data, RR.
(b) What are the DNS Resolvers and the place are they situated?
(c) Within the context of the RR, what’s the time to dwell, TTL?
four. The Wi-Fi routers are anticipated to have a DNS Relay.
What’s it? What does it do?
5. Describe the that means of the next two Useful resource Data:
(a) (abc.com, 123.45.67.89, A , 9hours)
(b) (xyz.internet, 89.67.45.123, MX)
6. From the RFC 1035 (www.ietf.org/rfc/rfc1035.txt) describe the RR format.
7. Go to www.misk.com/tools and enter the area title of your alternative.
Overview the knowledge supplied by deciding on DNSLOOKUP, WHOIS, and TRACEROUTE. What have you ever realized?
eight. Your PC has been suspiciously pinged from IP tackle 91.140.zero.140. Utilizing tools which might be freely accessible within the Internet, be taught as a lot as attainable about that IP tackle (Area title, bodily location, proprietor, tackle, and so forth.)
1. Outline the next and present an instance:
(a) Root DNS Server
Root DNS servers are the authoritative names of the servers that serve the foundation servers that are additionally referred to as the DNS root zone. Instance is a.root-servers.internet because the host title and 198.41.zero.four.2003.465.ba4ee:: 2:40 Apple, Inc.
(b) High Stage Area Identify servers
The High Area Identify Servers is outlined as the best ranges among the many domains that are situated within the DNS root zone. Examples are com, org, internet, gov, edu amongst others.
(c) Default Identify Server
The Default Identify Sever is used to routinely set new area registrations to the title server which is chosen. An instance is ns1.area.com.
2. Outline the next and present an instance:
(a) Authoritative Area Identify Servers – Main and Secondary.
Authoritative area server offers solutions to the queries which might be raised by DNS which incorporates the web site IP tackle, mail server amongst others. It homes the first title server which retains data of the unique copies of zone data and the secondary title server which depends on the first server. Examples are AAAA, SOA, MX, and PTR amongst others.
(b) Grasp Identify Server
Grasp Identify Server shops the unique copies for all of the zone data. The modifications are solely made on the data saved within the grasp zone data. Exampls are SOA, MX amongst others
(c) Slave Identify Server
Helps the grasp server and might substitute it when it isn’t functioning nicely. It reduces the DNS server load from the first title server. Instance is sec.instance.com
three. Within the context of DNS
(a) What are the Useful resource Data, RR.
RRs are the inspiration of constructing the host-name and IP addresses. In additions, all the problems that concern the DNS are resolved by RR. They exist in several codecs and information.
(b) What are the DNS Resolvers and the place are they situated?
DNS resolvers are used to transform the Internet hyperlinks to IP tackle and subsequently present linkage between the pc and DNS infrastructure. They’re situated within the Web Service Suppliers.
(c) Within the context of the RR, what’s the time to dwell, TTL?
TTL is the time period in seconds that the resolver catches any document. Zero seconds is a sign that no document must be cached.
four. The Wi-Fi routers are anticipated to have a DNS Relay.
What’s it? What does it do?
DNS relays is a state of affairs whereby various machines ship the DNS queries to the relay. It’s used to ship and obtain the solutions to the machines and retailer queries for a short while.
5. Describe the that means of the next two Useful resource Data:
(a) (abc.com, 123.45.67.89, A , 9hours)
Hosts tackle (A) useful resource document and Maps area title (abc.com) to an web IP tackle 123.45.67.89 for 9 hours.
(b) (xyz.internet, 89.67.45.123, MX)
Host Grasp Identify server and maps the area title xyz.internet to an web of IP tackle 123.45.67.89.
6. From the RFC 1035 (www.ietf.org/rfc/rfc1035.txt) describe the RR format.
The format is used to explain the registration by organisations to manage the excessive degree domains and delegate to the subzones. It, subsequently, accommodates the authoritative title server if it isn’t recognized, maps and returns it to the native title server.
7. Go to www.misk.com/tools and enter the area title of your alternative.
Overview the knowledge supplied by deciding on DNSLOOKUP, WHOIS, and TRACEROUTE. What have you ever realized?
The device offers means to view particular DNS, the possession and the trail the place it’s situated.
eight. Your PC has been suspiciously pinged from IP tackle 91.140.zero.140. Utilizing tools which might be freely accessible within the Internet, be taught as a lot as attainable about that IP tackle (Area title, bodily location, proprietor, tackle, and so forth.)
The proprietor of the tackle is Wind Hellas Telecommunications situated in Athens Greece and hostname is adsl-140.91.140.zero.tellas.gr and area title www.windhellastelecommunications.com.
