- What does a DNS do?
- What is the advantage of using domain names rather than IP address?
- What are some of the shortcomings of DNS?
- Is DNS a protocol?
- How many types of DNS are there?
- Is DNS same as IP?
- What are 2 benefits of using domain name system?
- What is the difference between domain and IP address?
- What are the vulnerabilities of DNS?
- What is one vulnerability of DNS and how is that vulnerability attacked?
- What are the most common types of attacks directed against the domain name system and what could be done to prevent or mitigate the consequence of an attack?
- What layer is DNS?
- What is default gateway IP?
- How do DNS work?
Advantages: – More Reliable: Delivers messages to the users with zero downtime.
– Faster: DNS are connected well at intersections of internet.
Anycast technology enables requests are answered to the next closest node in the case of maintenance or downtime.
What does a DNS do?
Domain Name Servers (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.
What is the advantage of using domain names rather than IP address?
So, you can switch a web hosting provider and keep a domain name, but it is harder to keep the same IP address. IP address provide a routing structure for a network. Domain names provide a lookup service; a phone book, so to speak.
What are some of the shortcomings of DNS?
- One of the main disadvantages of the DNS is the fact that its registry can only be controlled ICANN, a non-profit organisation with roots tied in one country.
- DNS queries usually don’t carry any information about the clients who initiated it.
- DNS servers are based on the principle of a slave-master relationship.
Is DNS a protocol?
(Although many people think “DNS” stands for “Domain Name Server,” it really stands for “Domain Name System.”) DNS is a protocol within the set of standards for how computers exchange data on the internet and on many private networks, known as the TCP/IP protocol suite.
How many types of DNS are there?
3 types of DNS servers—DNS Resolver, DNS Root Server and Authoritative Name Server. 10 types of common DNS records—including A, AAAA, CNAME, MX and NS.
Is DNS same as IP?
An IP address is an address assigned to any computer (including servers) to identify it on a given network. A DNS address is a Domain Name Service which is used to convert alphabetic references into a server’s IP address generally for hosting services. An example of a DNS name is “ns1.godaddy.com”.
What are 2 benefits of using domain name system?
DNS translates the names of domain into meaningful to humans into binary identifiers that are associated with the equipment of network to locate and address these devices. Advantages: – More Reliable: Delivers messages to the users with zero downtime. – Faster: DNS are connected well at intersections of internet.
What is the difference between domain and IP address?
Domain Names : Domain Names are human readable name which identifies IP address. Domain Names are used in URLs to identify particular Web pages. IP address: IP(Internet Protocol) address is a numerical label given to each device connected in computer network that uses Internet Protocol for communication.
What are the vulnerabilities of DNS?
There are three major vulnerabilities with DNS to watch out for, which attackers often exploit to abuse DNS:
- Internal DNS servers hold all the server names and IP addresses for their domains and will share them with anyone that asks.
- DNS caches aren’t “authoritative, and they can be manipulated.
What is one vulnerability of DNS and how is that vulnerability attacked?
Cache poisoning – the attacker corrupts a DSN server by replacing a legitimate IP address in the server’s cache with that of another, rogue address in order to redirect traffic to a malicious website, collect information or initiate another attack. Cache poisoning may also be referred to as DNS poisoning.
What are the most common types of attacks directed against the domain name system and what could be done to prevent or mitigate the consequence of an attack?
Attack #1: DNS Poisoning and Spoofing
- Trickle-down DNS caching. DNS caching is used throughout the Web to accelerate load times and reduce strain on DNS servers.
- Poisoned DNS caches.
- Antidote for the poison.
- Crank up and amplify.
- Deflect and defend.
- Prevent and Mitigate Attacks.
What layer is DNS?
In OSI stack terms, DNS runs in parallel to HTTP in the Application Layer (layer 7). DNS is in effect an application that is invoked to help out the HTTP application, and therefore does not sit “below” HTTP in the OSI stack. DNS itself also makes use of UDP and more rarely TCP, both of which in turn use IP.
What is default gateway IP?
Ad. In the networking world, a default gateway is an IP address that traffic gets sent to when it’s bound for a destination outside the current network. On most home and small business networks—where you have a single router and several connected devices—the router’s private IP address is the default gateway.
How do DNS work?
DNS translates domain names to IP addresses so browsers can load Internet resources. Each device connected to the Internet has a unique IP address which other machines use to find the device. DNS servers eliminate the need for humans to memorize IP addresses such as 192.168.