CBSE Class 12 Informatics Practices Sample Paper SA2 2015 (1).Sample Papers are the very important for every student. The sample papers should be practiced to gain extra marks in examinations. The sample papers have been prepared based on summative assessment1 and summative assessment 2 pattern. The sample papers have been prepared based on pattern of last year examinations and as per latest changes in the syllabus. Students, teachers and parents can download all CBSE educational material and very well prepared worksheets from this website. All CBSE educational material is developed by our panel of teachers, have also been submitted by CBSE teachers and students.
1.a. Mrs Ruchi is planning to connect all the 15 computers in her office to make a LAN. Suggest an intelligent network device to connect all the nodes
b. Mrs reshma wants to send/receive e-mail over TCP/IP networks(internet).Which protocol she can use for this purpose?
answer :SMTP(Simple Mail Transfer Protocol)
c.An Internet Service Provider has a network within a city area. Which type of network is it?
answer :MAN (Metropolitan Area Network)
d.Which transmission technology can we use for connecting two countries over an ocean?
e.What is the difference between free software and freeware ?
answer :Free software : Freely accessible, freely used,changed,improved,copied and distributed to all. No payments required. Source code available.
Freeware : Freely available, freely used but it has stipulated time, after period of time, license fee should be paid. -each explanation 1 mark
f.Mrs Kamini is not clear about the wireless and wired media of communication kindly describe it to her with suitable example.
answer :Wired Media : It is the physical connection for connecting different devices on network. Also called Guided Media. different types cable can be used like coaxial cable, optical fibe,etc.
Wireless Media: No any physical connection between the devices on network. Also called Un-guided media. Different unguided media can be used like microwave, radiowave, satellite, Bluetooth etc. -each explanation 1 mark
g.What is DOS(Denial of Service) attack ? Explain briefly.
answer :DOS (denial of Service) : types of attacks that prevent the legitimate users of the system.from accessing or using the resources, information or capabilities of the system.
(a)Write HTML code to produce a Textarea with 10 rows and 30 columns.
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