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Doctors Medicines MCQs Q&A

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Open System Interconnected বা OSI এর 7টা লেয়ার আছে। OSI মডেল কোন নেটওয়ার্ক মডেল বিকাশে একটি নির্দেশিকা Tool হিসেবে কাজ করে।

Software Layer7ApplicationEnd user layer
HTTP. FIP
6PresentationSyntax layer 
*SSH, FTP, JPEG
5SessionSynch and Send to port
Sockets
Hardware Layer4TransportTCP, UDP, End to end connection
3NetworkPacket IP. 1 Psec
2Data LinkSwitch, Bridge. Ethernet
1Physicalwirless, itubs, repeaters
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Read the following text and fill in each gap with a suitable word based on the information of the text. The Internet technology has helped design a large number of websites to facilitate social relations among people around that is most op networking services of social networks or social media. At present, Facebook is the most popular social media site, Googles Twitter, Linkedin, etc. are other frequently used social services. Social network services are web- based and hence, provide ways for the users to interact through the Internet. These services make it possible to connect people sharing interests and activities across the borders and thus have made the users feel that they really five in a global village. Why are social networks expanding so fast? The answer is simple. Most of the social services are cost-free. You can make use of them free, paying a very little to your Internet service provider.   The social networking services are expanding so fast because (a) ---- are cheap. Facebook is one of the most popular social network (b) ----. There are also other network services (c) ---- Google, Twitter, Linkedin, Social network services are based on (d) ----.  Users communicate with others through the Internet. These services (e) —-- made the world very small and people now feel that  they are now a part of a single global village.
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