OPS535 Notes

Absolute and relative paths

learn name: rchan
account on matrix: /home/rchan
file system: the root (the starting point - from the right) is /

Host name and Fully Qualify Domain name (FQDN)

host name: www
FQDN for the host: www.senecac.on.ca. (note the '.' at the end)
dns system: the root (the starting point - from the right ) is . (dot)

what is the minimum of partition(s) do you need to install Linux?

(a) 1 - 1    (v) - root file system
(b) 4 - 4
(c) 2 - 2
(d) 3 - 4

. domain - root domain - root name server

note: All caching only DNS servers must know who are the root name servers (i.e. their IP addresses)

Look up the IP for "scs.senecac.on.ca"

Caching name server will ask one of the 13 root name server the question: what is the IP address for scs.senecac.on.ca

Answer back from the root name server:

Sorry! I don't know, but you can ask the name server for the "ca" domain,

And here is its name (xxxxx) and ip address (ddddd)

....

Caching name server will ask one of the Name server for the senecac.on.ca domain the question: what is the ip address for scs.senecac.on.ca

possible answers:

(1) There is no such host.
(2) the ip for that host is 142.240.140.179

What will be the TTL for the cached records in the caching name server.

What if it is coming from the name server for senecac.on.ca?

Is there a field in each DNS record that we can specify the TTL?

Answer: Yes. there is a global TTL field and a local TTL field for each record in the zone file

Why do we need such kind of information?

Answer: So that the authoritative DNS server for the DNS record is still in control of the DNS mappings.

Does your primary name server need the information about the 13 root name servers?

Yes/no and why?

No, no, no. if you don't want your primary name server to keep any DNS cache!

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