In words, the query is saying, “ please send me the host names of the authoritative DNS for mit.edu”. This causes nslookup to send a query for a type-NS record to the default local DNS server. In this example, we have provided the option “-type=NS” and the domain “mit.edu”. Nslookup In words, this command is saying “ please send me the IP address for the host As shown in the screenshot, the response from this command provides two pieces of information: (1) the name and IP address of the DNS server that provides the answer and (2) the answer itself, which is the host name and IP address of Although the response came from the local DNS server at Polytechnic University, it is quite possible that this local DNS server iteratively contacted several other DNS servers to get the answer. When running nslookup, if no DNS server is specified, then nslookupsends the query to the default DNS server, which in this case is. In this example, the client host is located on the campus of Polytechnic University in Brooklyn, where the default local DNS server is. The above screenshot shows the results of three independent nslookup commands (displayed in the Windows Command Prompt). To accomplish this task, nslookup sends a DNS query to the specified DNS server, receives a DNS reply from that same DNS server, and displays the result. The queried DNS server can be a root DNS server, a top-level-domain DNS server, an authoritative DNS server, or an intermediate DNS server. In its most basic operation, nslookup tool allows the host running the tool to query any specified DNS server for a DNS record. To run it in Windows, open the Command Prompt and run nslookup on the command line. To run nslookup in Linux/Unix, you just type the nslookup command on the command line. In this lab, we’ll make extensive use of the nslookup tool, which is available in most Linux/Unix and Microsoft platforms today. From the DNS client’s standpoint, however, the protocol is quite simple – a query is formulated to the local DNS server and a response is received from that server. The some can go on “under the covers,” invisible to the DNS clients, as the hierarchical DNS servers communicate with each other to either recursively or iteratively resolve the client’s DNS query. The client’s role in the DNS is relatively simple – a client sends a query to its local DNS server, and receives a response back. In this lab, we’ll take a closer look at the client side of DNS. Hi ,could someone please help me with this Wireshark lab.ĭomain Name System (DNS) translates hostnames to IP addresses, fulfilling a critical role in the Internet infrastructure.
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