Domain Information Groper (DIG) is another helpful tool. You can use DIG to discover everything nslookup can supply. However, DIG has one more option not available in nslookup:the ability to
Author: Sophie Grant
Encrypted DNS Records– Cisco Names and TimeEncrypted DNS Records– Cisco Names and Time
DNS responses are also important for security; consider the network shown in Figure 16-9. Figure 16-9 DNS Man-in-the-Middle Attacks In Figure 16-9: 1. Host A sends a query to the
Authoritative Servers– Cisco Names and TimeAuthoritative Servers– Cisco Names and Time
Authoritative DNS servers are maintained by any organization that assigns and manages domain names, including • Large organizations like colleges and companies that have a domain name. • Domain name
Root Servers– Cisco Names and TimeRoot Servers– Cisco Names and Time
DNS was initially deployed on four physical root servers, running on PDP-10 mainframe computers, in the mid-1980s. Three different organizations ran these four servers: • SRI International managed one DNS
Negative DNS Responses– Cisco Names and TimeNegative DNS Responses– Cisco Names and Time
What happens when a user types in a non-existent domain name? The host will still build a query and send the query to the recursive server. How the recursive server
The Life of a DNS Query– Cisco Names and TimeThe Life of a DNS Query– Cisco Names and Time
A domain name is often used in a Uniform Resource Locator (URL) context. A URL normally has two parts: • A service, like https:// and ftp:// • A domain name
The Domain Name Space– Cisco Names and TimeThe Domain Name Space– Cisco Names and Time
Figure 16-1 illustrates the dotted decimal format of domain names. Figure 16-1 DNS Name Format The DNS namespace is hierarchical. Moving from the right to the left: • The name
“Do I Know This Already?” Quiz– Cisco Names and Time“Do I Know This Already?” Quiz– Cisco Names and Time
Take the quiz (either here or use the PTP software) if you want to use the score to help you decide how much time to spend onthis chapter. Appendix A,
Reflection Attack– Cisco Attacks and ThreatsReflection Attack– Cisco Attacks and Threats
Reflection attacks use well-connected servers to reflect and amplify a DDoS attack. Figure 19-5 illustrates a reflection attack. Figure 19-5 DDoS Reflection Attack A DDoS reflection attack proceeds in two
Ransomware– Cisco Attacks and ThreatsRansomware– Cisco Attacks and Threats
Suppose the attacker is concerned about building the C2 system needed to dwell in a breached network for a long while, or perhaps they are concerned the process of exfiltrating