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a. If a password to a cipher is exactly 8 characters long, and each character can be selected from [0-9], [a-z], and [A-Z], how many different passwords are possible?
b. Suppose a system requires passwords be 8 characters long, include at least one capital letter, at least one digit and at least one character from the set of 5 special characters { !,#,%,&,*} . What advantage does this provide an attacker who is trying to guess a password?
Define the Types of Computer Network Computer networks fall into three classes regarding the size, distance and the structure namely: LAN (Local Area Network), MAN (Metropolita
Repeaters - Operate only in physical layer - Connects two segments of the same LAN - Both segments must be of the same protocol - Only forwards frames; does not filter
With an object server, the Client/Server application is taken as a set of communicating objects. Client object commune with server objects using an Object Request Broker (ORB). The
Q. What is Peripheral Connect Interface? PCI signify Peripheral Connect Interface. It's the revolutionary high speed expansion bus presented by Intel. With the growing signifi
Bens Network Ben's network is a non-blocking network. It is a different type of Clos network where initial and final stage consists of 2×2 switches (for n input and m ou
ICMP is used to send error and control messages. Ping uses ICMP to carry the echo-request and echo-reply.
Q. Explain about Twisted-Pair Cable? - Two conductors surrounded by insulating material - One wire utilize to carry signals and other used as a ground reference - Twistin
what is man LAN wan
What are the important topologies for networks? BUS topology: In this every computer is directly linked to primary network cable in a single line. Advantages: Inexpensive,
One of the key roles of a System/Network Administrator is to monitor log files. This usually requires helper scripts (i.e. Perl programs) so a summary of large log files can be qui
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