Domain Name System - PowerPoint PPT Presentation
Title:
Domain Name System
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Cyber ICSS helps industries in understanding the rapidly growing security threats against the networks and to combat hackers. ICSS also offers consultancy services in protecting critical Infrastructure around the world through its partner network. Our courses includes Diploma in Cyber Security, PG Diploma in Cyber Security, CEH, CHFI, ECSA. Our aim is to train the cyber security expert of tomorrow who is equally at ease in protecting the conventional or the latest cutting edge network. – PowerPoint PPT presentation
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Title: Domain Name System
1
What is DNS Attack?
- Indeed, DNS attacks happen when a hacker is able
to find weaknesses to exploit in the DNS (Domain
Name System). - Hackers take advantage of vulnerabilities make
DNS attack possible. In order to understand, how
DNS attacks actually work, you will have to first
understand how DNS works. - For those who dont know, domain name system is
a protocol that interprets an alphabetic domain
name into IP address. In short, its major
function is to convert a user-friendly domain
name into the computer-friendly IP address.
2
How DNS Works?
- When a user types a domain name in the browser, a
program available in the operating system known
as DNSresolver searches for IP address of that
domain name. - First, DNS resolver searches its own local cache
and check if it already has the IP address for
that domain. If it does not find it in the local
cache, It queries a DNS server to check if it
knows the accurate IP address for that domain. - DNS servers work in a loop which means they are
able to query each other to find the DNS server
that knows the correct IP address of the domain
name.
3
How DNS Works?
- As soon as DNS resolver locates the IP address,
it returns the IP address to requesting program.
DNS caches domain address for future use as well. - Though Domain Name System is quite powerful yet
it seems less focused toward the security. Maybe
thats why we are noticing different types of DNS
attack. - To minimize the possibilities of DNS attack,
server administrators must take some necessary
steps. They can use an upgraded version of DNS
software and regularly configure servers to
duplicate. At a personal level, users can flush
their DNS cache to avoid security risks. If you
dont know how to flush DNS, read a resourceful
post at ICSS India.
4
How Hackers Use DNS?
- The biggest issues with DNS system is that if on
any account a hacker is able to find a way to
replace the authorized IP address of a website
with rogue IP address, then any person trying to
access that website will be sent to a bogus
address. The user would not have any idea that he
is accessing the wrong address. - One of the major problems with DNS server
configuration is that it does not remember its
default configuration. Attackers take advantage
of this loophole.
5
Thank You
- For more information you can visit us at
- International College For Security Studies
- ( Cyber Security ICSS )
