Description
1. Do&a&literature&survey&to learn&about&SMS&(Short&Message&Service).&What&are&
the&different&types&of&SMS?&What&kind&of&application&architecture&does&SMS&
use?&Explain&your&answer.
2. (Tools&exercise)&Telnet&into&a&mailserver (telnet&mailserver&25)&and&send&an&
email&to&yourself&and&an&email&to&your&friend.&Submit&a&print&out&of&message&
exchanges&between&SMTP&client&and&server.
3. Suppose&a&webpage&consists&of&five&objects:&base&HTML&file&(Ob),&another&
HTML&object&(Oa),&and&three&jpeg&objects&(O1,&O2 and&O3).&Draw&a&diagram&to&
show&message&exchanges&between&a&client&and&the&server,&when&the&client&
downloads&this&webpage,&when&(a)&nonSpersistent&HTTP&is&used;&(b)&a&
persistent&HTTP&with&pipelining&is&used.
4. Do&a&literature&survey&to&find&out&what&is&a&whois database.&Use&various&whois
databases&on&the&Internet&to&obtain&the&names&of&two&DNS&servers.&Indicate&
which&whois databases&you&used.
5. Visit&http://www.iana.org and&answer&the&following&questions
a. What&are&the&wellSknown&port&numbers for&network&news&transfer&
protocol&(NNTP),&NETBIOS&session&service,&and ISOSIP?
b. What&are&the&requests&processed&as&a&part&of&”Root&Management”&of
IANA?
6. Visit&http://www.root4servers.org.&Look&at&the&monthly&graph (2Shour&
average)&of&IPv4 bits/s&and&IPv6&bits/s&in&the&root&server&managed&by U.S.&
Army&Research&Laboratory.
a. When&did&the&maximum&and&minimum,&incoming&and&outgoing&data&
rate occured?
b. Approximately&what&is&the&difference&between&IPv4&data&rate&and&IPv6
data&rate?
7. Do&a&literature&survey&of&key&escrow,&mandatory&key&disclosure&law&and&
mandatory&decryption&law.&&Define&them&briefly&and&provide&your&views&
(about&half&page)&about&them.
8. Exercise&14&(Page&692)&5th Edition&or
Exercise&13&(Page&636)&4th Edition
9. Suppose&a&firewall&is&configured&to&allow&outbound&TCP&connections&but&
inbound&TCP&connections&only&to&specified&ports.&What&problem&does&this&
cause&in&using&ftp&to&download&a&file&from&an&outside&server?&How&can&you&fix&
this&problem?
10. How&is&a&digital&signature&different&from&user&authentication?&Explain&with&an&
example