6.6

Question 1

What are the symptoms of name resolution problems?

Answer 1

Cannot lookup by domain name, but by IP

Question 2

What is the role of the HOSTS file in the name resolution process?

Question 3

What happens if a host requests a name without the IP mapping cached?

Answer 3

The host asks the resolver

Question 4

What does “ipconfig /all” do?

Answer 4

Show all resolvers

Question 5

In linux, what does “/etc/resolv.conf” do?

Answer 5

Shows resolver addresses

Question 6

What’s the first thing to check if a single host cannot resolve names?

Answer 6

Check that they can ping the correct name server

Question 7

What happens if multiple hosts are affected?

Answer 7

Server is the issue

Question 8

How to troubleshoot Name Resolution (3)

Answer 8

Check local name cache.
Check HOSTS
Verify DNS records using nslookup or dig

Question 9

What do these commands do?
“ipconfig /displaydns”
“ipconfig /flushdns”

Answer 9

Shows DNS records
Clears DNS cache

Question 10

What is HOSTS?

Answer 10

List of host name to IP address mappings

Question 11

What does “%SystemRoot%\system32\drivers\etc" check in Windows?

Answer 11

HOSTS file - List of host name to IP address mappings

Question 12

What does “/etc” check in Linux?

Answer 12

HOSTS file - List of host name to IP address mappings

Question 13

What can you do with “nslookup” or “dig” tools?
What does DIG stand for?

Answer 13

Verify DNS records
Domain Information Groper

Question 14

What do these commands do?

Win: “ipconfig /all”
Lin: “hostname –fqdn

Answer 14

Check FQDN in Win/Lin

Question 15

what happens if you use “nslookup” only?

Answer 15

Goes to interactive mode

Question 16

What id “dig” primarily for?

Answer 16

Querying DNS servers and related info

Address record, domain, FQDN,