Linux System Administration and IP Services


Final Exam
----------

1.) Which key should you apply a passphrase on? (Check one)
	- Public key?    [  ]
	- Private key?   [  ]

2.) In our classroom what was the IP address of the authoritative nameserver for
    the ws.nsrc.org zone?


3.) What is the best operating system to use to provide core Network services such as 
    email, web, DNS, etc…? (Check one)

	- UNIX     [   ]
	- Linux    [   ]
	- Windows  [   ]
	- Other    [   ]

4.) How many usable IP addresses are available in a /24 network?


5.) If you have a subnet on your campus that contains 126 usable IP addresses what is
    the netmask for that network? (Check one)

	- /24 (255.255.255.0)     [  ]
	- /23 (255.255.254.0 )    [  ]
	- /25 (255.255.255.128)   [  ]

6.) If you have two 100 Mbps circuits, which are:
	a.) 1 km of optic fiber
 	b.) Via satellite with a distance of 30 km between the base and the satellite

    For two packets of the same size which will have the larger transmission delay? 
	
	Circuit a  [  ]
	Circuit b  [  ]
	Neither    [  ]

    Propagation delay?

	Circuit a  [  ]
	Circuit b  [  ]

7.) What command can you use to find the name servers for a sub-domain? (Check one)

	dig  [  ]
	top  [  ]
	bind [  ]

8.) In order to connect and authenticate to a remote machine using SSH without using 
    passwords what  type of cryptography are we using?

	public / private keys [  ]
	symmetric ciphers     [  ]
	hybrid systems        [  ]