DNS behaviors of a Cisco router are important topics for both the CCNA exam and real-world production networks, and you probably didn't know there were so many DNS details before you began studying for the exam! In this tutorial, we'll look at the ip name-server command and its proper usage.
Laptop Battery When a command is mistyped on a Cisco router, the default behavior of the router is to attempt to resolve it via DNS. First, the router looks for an IP Host table on the local router to perform this resolution - that's what the "translating" word in the output is referring to. If there's no IP Host table or the IP Host table doesn't contain an entry for what you typed, the router will send a broadcast in an attempt to resolve this name through a remote DNS server. To prevent this broadcast, enter the global command no ip domain-lookup. Of course, to use DNS to resolve hostnames, ip domain-lookup would have to be reenabled if it's been turned off.
821, the first exam in Cisco' exam Cisco Certified Network Associate (CCNA) certification track. Understand networking for the small or home office market, prepare for the exam, and acquire the skills you need with this comprehensive guide. Inside you'
Thinkpad R2#contin
Errata Description Author Information Cisco Certified Network Associate Study Guide, 6th Edition ( 04700110082) -The Cisco Certified Network Associate (CCNA) tier certification and by far its most popular. depth coverage of every exam objectives, plus updates that reflect technology developments over the past years. It addition, it offers expanded coverage on key topics reflected in the new version of the exam. Finally, the enhanced CD contains over an hour of useful video and audio files, as well as the Sybex Test Engine, Flahscards, and entire book in PDF format.
Microsoft
Translating "contin"...domain server (255.255.255.255)
level certification. or user requirements. They should also be able to develop and test a prototype network that validates the design to the user's satisfaction. Candidates must possess a valid CCNA or CCDA certification prior to taking these exams. For rmation on the CCDP program, visit the related page on the Cisco Web site.
Laptop Computers % Unknown command or computer name, or unable to find computer address
Cisco networking authority Todd Lammle has completely updated this new edition to cover all of the exam objectives for the latest version of the CCNA exam. Todd’s straightforward style provides lively examples, understand analogies, world scenarios that will not only help you prepare for the exam, but also give you a solid foundation as a Cisco networking professional.
Laptop Computer
A command is mistyped as "contin". The Cisco router's default behavior is to resolve this entry locally via an IP Host table, which isn't present on the router. A broadcast is then sent out to find a DNS server to perform the name resolution. The DNS lookup attempt must time out before the configuration can continue.
To become a Cisco Certified Network Associate (CCNA), you must learn the hundreds of IOS commands used by Cisco routers and switches. This handy reference from Cisco networking authority Todd Lammle is just what you need to master those commands. From a thorough introduction to Ciscos basic operating system to making the transition to IPv6, Todd Lammle walks you through hundreds of commands with short, world examples.
Desktop Computer
R2#conf t
Notebooks R2(config)#no ip domain-lookup
Lenovo R2#contin
Hard Drive Translating "contin"
Travelstar % Unknown command or computer name, or unable to find computer address
Gateway With "no ip domain-lookup" configured, the router doesn't attempt to find a remote DNS server. It sees there is no local resolution configured and almost immediately sends a message to the console that the name can't be resolved.
Laptop Parts R2#conf t
Software R2(config)#ip domain-lookup
Hard Drives R2(config)#ip name-server 10.1.1.1
Electronics R2#contin
Canon Translating "contin"...domain server (10.1.1.1)
Desktop Pc A DNS server is installed on the network with the IP address 10.1.1.1. DNS lookup is reenabled with the command ip domain-lookup, and the IP address of the DNS server is specified with the ip name-server command.
Desktop Computers It's just that easy to tell a Cisco router exactly where the DNS server is!
Think Pad
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