Cisco CCNA Certification Exam Tutorial: DNS And The IP Name-Server Command

DNS behavior of a Cisco router are important issues for the CCNA exam and the real world of production networks, and you probably do not know there were so many DNS information before you started for the exam! In this tutorial, we will look at the IP name server command and its proper usage.
When a command is wrong on a Cisco router, the default behavior of the router is to try to resolve it via DNS. First, the router is seeking an IP host table on the local router to this resolution - that is what the translation " " word in the issue relates to. If there is no IP host table or the IP host table does not contain an entry for what you typed the router sends a broadcast in an attempt to resolve this name by a remote DNS server. To prevent this mission, enter the command no global ip domain-lookup. Of course, to use it to DNS host name, ip domain-lookup would be if it had been re-activated off.
R2 contin
Translating " " continue ... Domain Server (255.255.255.255)
% Unknown command or computer name, or unable to find computer address
A command is wrong as " continue ". The Cisco routers the default behavior is to resolve this entry locally via an IP host table, which is not based on the router. A shipment will be to find a DNS server for name resolution. The DNS lookup time try before the configuration can continue.
R2 conf t
R2 (config) no ip domain-lookup
R2 contin
Translating " continue "
% Unknown command or the name of the computer or not able to find computer address
With " no ip domain - lookup " configured the router is not listed, a remote DNS server. It seems there is no local resolution configured and almost immediately sends a message to the console, that the name is not resolved.
R2 conf t
R2 (config) ip domain-lookup
R2 (config) ip name-server 10.1.1.1
R2 Contin
Translating " " continue ... Domain Server (10.1.1.1)
A DNS server is installed on the network with the IP address 10.1.1.1. DNS lookup will be restored with the command ip domain-lookup, and the IP address of the DNS server with the IP name server command.
It & 39; s so easy to say, a Cisco router exactly , where the DNS server is!
Chris Bryant, CCIE 12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, Ultimate CCNP Study Packages, CCNA CBT and Video training. Pass for the CCNA exam, BSCI exam, and BCMSN exam with Chris Bryant, CCIE 12933!
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