Which Of The Following Types Of Attack Is The DNS Server Being Protected From By Using The Random Port Number From A Socket Pool?

This feature protects the DNS cache records

against possible DNS cache poisoning attacks by malicious users on the Internet

. Cache locking is configured as a percent value. Let’s say that you set the cache locking value at 75, the DNS server will not overwrite a cached entry for 75% of the duration of the TTL.

What is DNS cache locking and what type of attack does it prevent?

This feature protects the DNS cache records

against possible DNS cache poisoning attacks by malicious users on the Internet

. Cache locking is configured as a percent value. Let’s say that you set the cache locking value at 75, the DNS server will not overwrite a cached entry for 75% of the duration of the TTL.

What attacks can be used against DNS?

Some of the most common types of DNS attacks are the

DDoS attack

, DNS rebinding attack, cache poisoning, Distributed Reflection DoS attack, DNS Tunneling, DNS hijacking, basic NXDOMAIN attack, Phantom domain attack, Random subdomain attack, TCP SYN Floods, and Domain lock-up attack.

What is DNS cache locking?

DNS cache locking is

a security feature that you can use to control when information in the DNS cache can be overwritten

.

How DNS can be used for security?

DNS resolvers

can also be configured to provide security solutions for their end users (people browsing the Internet). Some DNS resolvers provide features such as content filtering, which can block sites known to distribute malware and spam, and botnet protection, which blocks communication with known botnets.

What port is used by DNS to issue queries?

The answer is DNS is mostly

UDP Port 53

, but as time progresses, DNS will rely on TCP Port 53 more heavily.

What is the default size of the DNS socket pool?

Now, this pool is enabled by default in Windows Server 2019 and it’s actually set to a pool size of

2500

, but it is modifiable. There is a command that you can use from the command line. Okay, so it’s dnscmd/Config/SocketPoolSize and then you can enter a value anywhere from zero to 10,000.

What happens if your DNS is attacked?

Domain Name System (DNS) is a very basic protocol and service that enables Internet users and network devices to discover websites using human-readable hostnames instead of numeric IP addresses. … If the DNS service is attacked or doesn’t function properly,

your service/website may become inaccessible

.

Which domain is most attacked?

NEW DELHI:

India

saw the highest number of domain name system or DNS attacks in 2020 with 12.13 attacks per organisation, even though the cost of attacks in the country decreased by 6.08% to ₹5.97 crores, said International Data Corporation or IDC’s DNS Threat Report.

What problems can DNS cause?

• Improperly Configured DNS Records. DNS problems usually stem from improper configuration of DNS records during most times. …
• High TTL Values. TTL refers to time to live. …
• DDOS Attacks. …
• Hardware/Network Failures. …
• High DNS Latency. …
• Conclusion.

How do I check my DNS cache?

1. Type ipconfig /displaydns and press Enter.
2. Observe the contents of the DNS resolver cache. It is generally not necessary to view the contents of the DNS resolver cache, but this activity may be performed as a name resolution troubleshooting method.

How long does the DNS cache last?

By default, Windows stores positive responses in the DNS cache for

86,400 seconds

(i.e., 1 day) and stores negative responses for 300 seconds (5 minutes).

How do I change my DNS cache?

1. Select the “Start” button, then type “cmd“.
2. Right-click “Command Prompt“, then choose “Run as Administrator“.
3. Type ipconfig /flushdns then press “Enter“. ( be sure there is a space before the slash)

What are the two main benefits of DNS?

• can map to a new IP address if the host’s IP address changes.
• are easier to remember than an IP address.
• allow organizations to use a domain name hierarchy that is independent of any IP address assignment.

Which DNS is most secure?

• Google Public DNS. IP Addresses: 8.8.8.8 and 8.8.4.4. …
• OpenDNS. IP Addresses: 208.67.220.220 and 208.67.222.222. …
• DNSWatch. IP Addresses: 84.200.69.80 and 84.200.70.40. …
• OpenNIC. IP Addresses: 206.125.173.29 and 45.32.230.225. …
• UncensoredDNS.

How do I improve DNS security?

1. Mitigate DDoS attacks with multilayered protection. …
2. Isolate nameservers through segmentation. …
3. Use a non-open source resolver. …
4. Deploy DNS security extensions (DNSSEC) …
5. Increase resilience with a private DNS network.