Practice Test 3 Discussion

UNIX/Linux Network Administration - Rich Simms
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corey douthett
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Practice Test 3 Discussion

Post by corey douthett » Wed May 15, 2013 6:55 pm

Here are my answers to practice test 3:

Please discuss/debate/review as needed!

***THESE ARE NOT GUARANTEED TO BE CORRECT ANSWERS***

1. Use dig to find all the authoritative name servers for the top level edu domain. The IPv4 addresses for these name servers all have the same value for the 4th octet. What is that value?

ANS: 30

2. A server named treebeard in the CIS Lab has been configured as a name server. For the 192.20.172.in-addr.arpa zone, what host does "238" resolve to? (Specify the FQDN)

ANS: p34-elrond.cis192pods.cislab.net

3. From your Elrond VM show the NFS exports on Hershey and mount the one named /simms/dylan. What is the last line of the only file in that exported directory?

ANS: I might be in the swamp

4. When configuring an NFS export in the /etc/exports file, what is the sync option used for?

ANS: sync writes data to disk instead of buffering it

5. What are the names of the printers installed on Opus?

ANS: charlie and hplaser

6. A /etc/samba/smb.conf file contains a definition for the share shown above. What line must be added to this share definition to block access to the hoocap192 user?

ANS: invalid users = hoocap192

7. For the email sent above, what destination host choices did the sending MTA have to reach the MTA handling the destination domain? (Identify these choices by their FQDN's)

ANS: homiemail-mx21.g.dreamhost.com, mail.cruzio.com, cruziomail.cruzio.com

8. For the email sent above, what MUA and version number was used by the sender?

ANS: SquirrelMail/1.4.20

9. The NIS service: (choose best answer)
a) was developed by Nintendo to enable games to be played over the Internet
b) was originally called Yellow Pages
c) extends the file system to allow remote directories to be mounted locally
d) was licensed by Microsoft as the underlying engine powering Active Directory

ANS: b

10. Looking at the firewall for the system above, what email AA service is most likely installed?

ANS: IMAP

11. For the email above, use: http://whatismyipaddress.com/ to determine the original geographic location it came from (assuming headers were not modified during transit). Where did it originate?

ANS: Germany
Last edited by corey douthett on Mon May 20, 2013 8:33 am, edited 1 time in total.

David Hovey
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Re: Practice Test 3 Discussion

Post by David Hovey » Thu May 16, 2013 11:33 am

Always a plus to have all the questions in one forum... on first glance they look good but will dig into deeper inspection once im done with classes for this week.
Thanks!

shahram farahbakhsh
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Re: Practice Test 3 Discussion

Post by shahram farahbakhsh » Thu May 16, 2013 3:12 pm

How did you get #1?

I tried: dig mx *.edu

But it didn't return anything promising.

dig mx cabrillo.edu only gave me the ipv4 address to boris.cabrillo.edu which is 207.62.185.140

shahram farahbakhsh
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Re: Practice Test 3 Discussion

Post by shahram farahbakhsh » Thu May 16, 2013 3:23 pm

Got it

dig +norecurse +noques +nostats +nocmd opus.cabrillo.edu @J.ROOT-SERVERS.NET.

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59866
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 7

;; AUTHORITY SECTION:
edu. 172800 IN NS d.edu-servers.net.
edu. 172800 IN NS c.edu-servers.net.
edu. 172800 IN NS g.edu-servers.net.
edu. 172800 IN NS l.edu-servers.net.
edu. 172800 IN NS f.edu-servers.net.
edu. 172800 IN NS a.edu-servers.net.

;; ADDITIONAL SECTION:
a.edu-servers.net. 172800 IN A 192.5.6.30
c.edu-servers.net. 172800 IN A 192.26.92.30
d.edu-servers.net. 172800 IN A 192.31.80.30
f.edu-servers.net. 172800 IN A 192.35.51.30
g.edu-servers.net. 172800 IN A 192.42.93.30
g.edu-servers.net. 172800 IN AAAA 2001:503:cc2c::2:36
l.edu-servers.net. 172800 IN A 192.41.162.30

Donna Irvan
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Re: Practice Test 3 Discussion

Post by Donna Irvan » Sat May 18, 2013 10:58 am

Thanks for you work. Can you tell me the process you used to get the answer to the extera credit question ?

shahram farahbakhsh
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Re: Practice Test 3 Discussion

Post by shahram farahbakhsh » Sat May 18, 2013 4:47 pm

Donna, I'm not sure if this is definitive, but I believe he looked at the 'From:' field in the middle of the email above the 'To: rsimms@cabrillo.edu'

From there he pulled nouser@synchronoss.com whose ip address he referenced further up in the email (37.93.223.119).

He likely plugged that address into the search field on whatsmyipaddress.com, which spat out Deutschland.

We should post how to attack every question, as well as the answers.

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Rich Simms
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Re: Practice Test 3 Discussion - Q2

Post by Rich Simms » Sun May 19, 2013 7:22 am

corey douthett wrote:2. A server named treebeard in the CIS Lab has been configured as a name server. For the 192.20.172.in-addr.arpa zone, what host does "238" resolve to? (Specify the FQDN)

ANS: nothing.attdns.com
Is that your final answer? One way would be to configure your system to use Treebeard or 172.30.5.8 (which delegates to Treebeard) as your nameserver to get the correct answer. Do the query multiple times if the first one fails.

- Rich

shahram farahbakhsh
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Re: Practice Test 3 Discussion

Post by shahram farahbakhsh » Sun May 19, 2013 12:48 pm

Rich, I'm getting the same answer for every computer configured with 172.30.5.8 as a nameserver. This includes my opus and elrond hosts.

Laura Sreckovic
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Location: France

Re: Practice Test 3 Discussion

Post by Laura Sreckovic » Sun May 19, 2013 1:42 pm

shahram farahbakhsh wrote:Got it

dig +norecurse +noques +nostats +nocmd opus.cabrillo.edu @J.ROOT-SERVERS.NET.

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59866
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 7

;; AUTHORITY SECTION:
edu. 172800 IN NS d.edu-servers.net.
edu. 172800 IN NS c.edu-servers.net.
edu. 172800 IN NS g.edu-servers.net.
edu. 172800 IN NS l.edu-servers.net.
edu. 172800 IN NS f.edu-servers.net.
edu. 172800 IN NS a.edu-servers.net.

;; ADDITIONAL SECTION:
a.edu-servers.net. 172800 IN A 192.5.6.30
c.edu-servers.net. 172800 IN A 192.26.92.30
d.edu-servers.net. 172800 IN A 192.31.80.30
f.edu-servers.net. 172800 IN A 192.35.51.30
g.edu-servers.net. 172800 IN A 192.42.93.30
g.edu-servers.net. 172800 IN AAAA 2001:503:cc2c::2:36
l.edu-servers.net. 172800 IN A 192.41.162.30

You got the same answer as Corey but you used a very long command try - dig NS edu

[srelau192@oslab ~]$ dig ns edu.

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3 <<>> ns edu.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41696
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 7

;; QUESTION SECTION:
;edu. IN NS

;; ANSWER SECTION:
edu. 137674 IN NS g.edu-servers.net.
edu. 137674 IN NS d.edu-servers.net.
edu. 137674 IN NS f.edu-servers.net.
edu. 137674 IN NS a.edu-servers.net.
edu. 137674 IN NS c.edu-servers.net.
edu. 137674 IN NS l.edu-servers.net.

;; ADDITIONAL SECTION:
a.edu-servers.net. 39148 IN A 192.5.6.30
c.edu-servers.net. 39148 IN A 192.26.92.30
d.edu-servers.net. 39148 IN A 192.31.80.30
f.edu-servers.net. 39148 IN A 192.35.51.30
g.edu-servers.net. 39148 IN A 192.42.93.30
g.edu-servers.net. 137674 IN AAAA 2001:503:cc2c::2:36
l.edu-servers.net. 39148 IN A 192.41.162.30

;; Query time: 11 msec
;; SERVER: 172.30.5.8#53(172.30.5.8)
;; WHEN: Sun May 19 13:08:40 2013
;; MSG SIZE rcvd: 256

Donna Irvan
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Joined: Fri Feb 15, 2013 12:29 pm

Re: Practice Test 3 Discussion

Post by Donna Irvan » Sun May 19, 2013 1:48 pm

Shahram, thanks for the process and the suggestion of posting the process for each question.

Cheers

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