Chapter Review Questions


DNS is said to provide a distributed name resolution service even though you can configure a single primary name server managing all hostnames and IP address resolution for your entire organization, located on one single centralized machine. In this instance, explain how DNS can still be regarded as a distributed service.


From where does a caching-only server obtain hostnames and IP addresses to resolve queries for the local domain? How does it arrive at communicating with those servers? Why would we consider using a caching-only server if it only works from data in its cache?


When we delegate the authority of a zone, the delegating name server needs to update its configuration files to reference the delegated name server. What configuration files does the delegated server need to update to reference the delegating name server? Why is this necessary?


Here are the /etc/dhcptab files from our DHCP server (IP address =


 #  cat /etc/dhcptab  dhcp_pool_group:\         pool-name=Finance:\         addr-pool-start-address=\         addr-pool-last-address=\         lease-time=604800:\         lease-policy=accept-new-clients:\         allow-bootp-clients=FALSE:\         hn:\         subnet-mask=\         gw=\         sr= :\\         ds=\         nt=\         pcsn:\         sp:\         ddns-address= # 

Here is the /etc/named.conf file from the same machine: our DNS primary master name server.


 #  cat /etc/named.conf  options {         directory "/etc/dns";         listen-on { any; }; }; key TSIGkey {         algorithm "hmac-md5";         secret         secret "L4Et2wOlxj6CYKIf8g2AbOjBaa+DSDhmGoDOARdsx4WfBbkbiwyKT+BFZ5dFBNrPY7XBDa graphics/ccc.gif /uSluKmfyB3kUPeQ==";         }; controls {         inet allow {; } keys { TSIGkey; };         }; zone "0.0.127.IN-ADDR.ARPA" {         type master;         file "db.127.0.0"; }; zone "" {         type master;         file "db.maabof";         allow-update { ; }; }; zone "1.192.IN-ADDR.ARPA" {         type master;         file "db.192.1"; }; zone "." {         type hint;         file "db.cache"; }; # 

We are attempting to allow automatic updates of IP addresses and hostnames within DNS . Will the configuration files work as they exist? Comment on any potential changes you would suggest making.


The rndc utility is used to communicate (securely) with the named daemon. To set up the secret keys used by rndc , we can use the rndc-confgen utility. Is there any other utility we could use to set up the secret keys? Why would we choose to not use rndc-confgen ?

HP-UX CSE(c) Official Study Guide and Desk Reference
HP-UX CSE(c) Official Study Guide and Desk Reference
Year: 2006
Pages: 434 © 2008-2017.
If you may any questions please contact us: