Domain name system is essential to any network. DNS converts host names to an IP address. Lisa Bock reviews components of a DNS request and reply using Wireshark.
- [Instructor] Domain Name System…is essential to any network.…DNS converts host names to an IP address,…and it uses Port 53 over UDP or TCP.…UDP is used on Port 53 for requests.…Why? It's a lightweight protocol,…and we want a response fast.…TCP, on Port 53, is for a full zone transfer.…With that, we want to make sure that we have all the parts,…so we wanna make sure that it's…a connection-oriented process when…we do a full zone transfer.…
Now, DNS queries and responses are pretty straight forward.…A client will send a query to a DNS server for an IP address…and the server responds with information.…When looking at a DNS header, there are four sections.…We have questions, answer resource records,…authority resource records, and additional resource records.…Depending on the query, you'll see a number…of different types of queries.…We'll look at some common ones.…You'll see type A, which is an IP version for address,…and MX is a mail exchange,…and AAAA, that is, an IP version six address.…
Let's take a look; I've done a quick capture,…
Note: The topics in this course will prepare you for key objectives on the Certified Ethical Hacker exam. Find an overview of the certification and the exam handbook at https://www.eccouncil.org/programs/certified-ethical-hacker-ceh/.
- Sniffing network traffic
- Passive vs. active attacks
- Comparing IPv4 to IPv6
- MAC and macof attacks
- Investigating DHCP attacks
- Detecting ARP and DNS spoofing
- Sniffing tools and techniques
Skill Level Beginner
1. Sniffing Overview
2. MAC Attacks
6. Sniffing Tools and Techniques
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