Cisco CCNA Certification Exam Tutorial: DNS name and IP-Server Command

DNS behavior of a Cisco router are important issues for both the CCNA exam and real production networks worldwide, and you probably did not know there were so many DNS details before you began studying for Review! In this tutorial we'll look at the ip name-server command and its proper use.

When a command is mistyped on a Cisco router, the default router is attempting to resolve the DNS. First, the router looks for a table of IP host on the local router to perform this resolution - that's what the "translating" word in the output refers. If there is no table d'hote or IP of the IP host table contains no entry for what is typed, the router sends a broadcast to resolve this name through a DNS server remote. To avoid this broadcast, enter the global command no ip domain-lookup. Of course, to use DNS to resolve hostnames, ip domain-lookup will be reactivated if it has been disabled.

Contin R2 #

Translate "continues" ... domain server (255.255.255.255)

% Unknown command or computer name, or unable to find the address of the computer

A command is misspelled as "Contin. Default behavior of Cisco router is to resolve this entry locally via an IP host table, which is not present on the router. A program is then sent to find a server to perform DNS name resolution. The DNS lookup attempt must time out before the configuration can continue.

R2 # conf t

R2 (config) # no ip domain-lookup

Contin R2 #

Translate "continues"

% Unknown command or computer name, or unable to find the address of the computer

With "no ip domain-lookup" configured, the router does not try to find a remote DNS server. She sees no local resolution configured and almost immediately sends a message to the console that the name can not be resolved.

R2 # conf t

R2 (config) # ip domain-lookup

R2 (config) # ip name-server 10.1.1.1

Contin R2 #

Translate "continues" ... domain server (10.1.1.1)

A DNS server is installed on the network with IP address 10.1.1.1. DNS Lookup is reactivated with the field of IP-Lookup command and the IP address of the DNS server is specified with the ip name-server command.
It's just that easy to tell a Cisco router exactly where the DNS server is!

Chris Bryant, CCIE # 12,933, is the owner of The Bryant Advantage, home of more than 100 tutorials free certification exam, including tests for Cisco CCNA certification prep items. Exclusive Cisco CCNA study guide her and Cisco CCNA training is also available!

Visit his blog and sign up for Cisco Certification Central, a daily newsletter packed with CCNA, Network +, Security +, A +, and CCNP practice questions certification exam! During a free 7-part "How to pass the CCNA", is also available, and you can participate in person or online CCNA boot camp with the advantage Bryant!

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Maemo 5 discussed in detail breathtaking granular

It's one thing to read an overview of the product here and there, but if you really want to experience Maemo 5 before you're even able to set foot in a store and buy a N900, look no further than Mobile -Review characteristically exhaustive look at the platform. In the infinite range of screenshots, you quickly get the impression that it is an attractive shell - scalable and familiar to owners of 770, N800 or N810, yes, but still significantly cooler. Here are some key takeaway for War & Peace-esque collection:

* There is apparently a N920 in the works that do not have a QWERTY keyboard. We've heard rumors in the past that remain only N900 Nokia Maemo 5 Phone for at least a few months, so we could watch to see it in 2010.
* The management process relies on a curiously webOS-screen as the map is superb. Help when you have a beefy OMAP3 there, is not it?
* The newspaper calls effortlessly aggregate GSM and VoIP calls - a tip and a nod to the roots as the Maemo platform VoIP friendly.
* MMS is not supported, strangely, even if the platform supports SMS supports both threaded and traditional views.
* While talking up calendar services Maemo's, Eldar says expressly that "WebOS Palm Powered organizer much more attractive and promising." Lack of synchronization of Google Calendar sucks, but we're not sure what exactly ? - Maemo does not support Exchange ActiveSync, after all.
* Eldar's the nail on the head of Mozilla Maemo is based on the browser: it has always been good, just too slow. The garlic cures the N900 on better hardware, but "it has not caught up with the rest of the squad yet." Charging Flash appears deranged and performance is not always great - it depends on how many applications are running.
* The music player is rather rudimentary (typical Nokia), while everyone satisfied with the sound quality of the N97 you feel at home here - it's the same hardware.
* The Maps app built-GAL apparently behind the bar that has established Ovi Maps on S60 - super slow and "resource-intensive."

Of course, the beauty of its philosophy Maemo is wide open, so many niggles here are not corrected by Nokia good hopefully be addressed by the broader community - and good news is that by the time you receive done reading this review, the N900 should be on store shelves for you to try.

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