Informal Exercises
/etc/hosts is a table of name-to-IP-address mappings
- Find out approximately how many hosts, subnets and domains are there in the RPI campus net
- Does this table give some addresses of root servers as well ?
- Why does the /etc/hosts in ECSE have the entire table for the campus net.
Lookup the file /etc/resolv.conf which gives the domain name and addresses of nameservers.
- Why are multiple nameservers listed ?
- Lookup the name of an IP address using nslookup. This generates a pointer query - you can watch it using tcpdump. What is unusual about pointer queries on the wire ?