Basic C++ and UNIX OS programming

Q1: Could you tell something about the Unix System Kernel? (from ITCO )

A1: The kernel is the heart of the UNIX openrating system, it’s reponsible for controlling the computer’s resouces and scheduling user jobs so that each one gets its fair share of resources.

Q2: What are each of the standard files and what are they normally associated with? (from ITCO )

A2: They are the standard input file, the standard output file and the standard error file. The first is usually associated with the keyboard, the second and third are usually associated with the terminal screen.

Q3: Detemine the code below, tell me exectly how many times is the operation sum++ performed ? (from ITCO )

for ( i = 0; i < j =" 100;"> 100 - i; j–)
sum++;
A3: (99 * 100)/2 = 4950
The sum++ is performed 4950 times.

Q4: Give 4 examples which belongs application layer in TCP/IP architecture? (from CISCO )

A4: FTP, TELNET, HTTP and TFTP

Q5: What’s the meaning of ARP in TCP/IP? (from CISCO )

A5: The "ARP" stands for Address Resolution Protocol. The ARP standard defines two basic message types: a request and a response. a request message contains an IP address and requests the corresponding hardware address; a replay contains both the IP address, sent in the request, and the hardware address.