21. Which one of the following is not used in media access control?
(A) ethernet
(B) digital subscriber line
(C) fiber distributed data interface
(D) packet switching
Answers
Explanation:
°•◉Thx=Thx◉•°Read the given statements and select the correct option.
(i) Obesity and excessive fat intake increases the likelihood of being an overweight adult; this
can put the individual at risk for cardiovascular diseases and other health problems.
(ii) A diet, heavily dependent on fast food, results in decreased energy, excess fat and a
deficiency of calcium, riboflavin, vitamin A , folic acid and fibre.
Answer:
21. b
22. c
23. b
24. a
25. d
26. c
27. a
28. c
29. a
30. d
Explanation:
21. Internet is nothing but an interconnected computer network providing a variety of communication facilities, consisting of a huge amount of small networks using standardized communication protocols.
22. The ISPs (Internet Service Providers) are the main agents through which every computer is connected to the internet. They are licensed to allot public IP addresses to its customers in order to connect them to the internet.
23. DSL (Digital Subscriber Line) is the technology designed to use the existing telephone lines to transport high-bandwidth data to service subscribers. DSL was used to allow the early users access to the internet and it provides dedicated, point-to-point, public network access.
24. ISPs exchange internet traffic between their networks by using Internet Exchange Points. ISPs and CDNs are connected to each other at these physical locations are they help them provide better service to their customers.
25. HTTP is used to browse all the websites on the World Wide Web, DHCP is used to allot IPs automatically to the users on the internet, and DNS is used to connect the users to the host servers on the internet based on the Domain Name.
26. An IPv6 address is 128 bits long. Therefore, 2128 i.e. 340 undecillion addresses are possible in IPv6. IPv4 has only 4 billion possible addresses and IPv6 would be a brilliant alternative in case IPv4 runs out of possible new addresses.
27. Packet switching is the method based on which the internet works. Packet switching features delivery of packets of data between devices over a shared network.
28. Resource reservation protocol is a transport layer protocol used on the internet. It operates over IPv4 and IPv6 and is designed to reserve resources required by the network layer protocols.
29. DHCP stands for Domain Host Control Protocol. It is responsible to remotely assign IP address to the clients connected to the internet. The server that performs this fuction is called the DHCP server.
30. Packet switching is not really related to media access control as it just features delivery of packets of data between devices over a shared network. Internet is actually based on packet switching.
hope it helps.
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