CS615A - Aspects of System Administration
Quiz #3


FULL NAME                       ______________________________________



USERNAME			______________________________________
(2 points)



1)  2 points
    The ``/YY'' in a netmask XXX.XXX.XXX.XXX/YY notation specifies

    a) the number of hosts on this subnet
    b) the number of bits in the network portion of the address
    c) the number of bits in the host portion of the address
    d) the number of subnets this host is part of
    e) none of the above


2)  2 points
    Which of the following files determines which nameserver should be
    queried?

    a) /etc/nsswitch.conf
    b) /etc/domain
    c) /etc/hosts
    d) /etc/resolv.conf
    e) none of the above, it's   _____________________________


3)  2 points
    An IPv4 address consists of

    a) 32 bytes
    b) 8 bytes
    c) 4 bytes
    d) 8 bits
    e) all of the above
    f) none of the above


4)  2 points
    An example of an Application Layer protocol is

    a) UDP
    b) ICMP
    c) SMTP
    d) IMPS
    e) all of the above
    f) none of the above


5)  2 points
    An email message...

    a) may not have more than 5 "headers" (From:, To:, Subject,: Date and one
       optional other header)
    b) must have the "envelope-from" in sync with the From: "header"
    c) requires its "stamp" to be accurate or else it won't get delivered by
       the MTA
    d) may be processed by more than one MTA
    e) this is all nonsense, stop confusing me


6)  8 points

    A user on a host A that is not running a name server wishes to send an
    email to jschauma@cs.stevens.edu.  Assuming the network the host is on has
    a DNS caching resolver B set up, but the resolver was just started (ie it
    contains no entries in its cache), describe the DNS lookups done by the
    hosts A and B.