Assignment A
1. What are the functions of OSI layers? Discuss.
2. a. Explain the types of line coding with neat diagrams.
b. Explain about RS-232 interface.
3. Explain in detail about the types of topologies.
4. Explain detail about the transmission media for data transmission.
5. a. i. What is a protocol? List the three key elements of a protocol.
ii. With relevant examples differentiate between simplex, half duplex and full duplex communication.
b. i. A sine wave complete one cycle in 25 microseconds. What is its frequency? Express the frequency in KHz.
Assignment B
1. What are the types of topology available and the number of links required to connect n machines?
2. Explain various types of substitution techniques.
3. SMTP, FTP and HTTP are protocols to transfer messages from one point to another. Compare and contrast their use
Assignment – C
1. Computer networks means collection of
1. computers
2. networks
3. phones
4. tv’s
2. Computer networks can share
1. printers
2. books
3. cd
4. none
3. By using computer networks, cost can be
1. increased
2. reduced
3. neutralized
4. none
4. By using computer networks, reliability can be
1. increased
2. reduced
3. neutralized
4. none
5. Computer networks can act as a communication medium between
1. persons
2. databases
3. both
4. none
6. By using computer networks, we can
1. shop online
2. pay bills online
3. surf
4. do all the above
7. E-mailing can be possible because of the availablity of
1. books
2. tv
3. computer networks
4. mp3 player
8. Based on transmission technology, computer networks can be classified into _____ types of networks
1. 1
2. 2
3. 3
4. 4
9. Broadcast networks have ________ communication channels.
1. 1
2. 2
3. 3
4. 4
10. Short messages are called
1. data
2. packets
3. information
4. fields
11. In packets, ____ field contain information about to whom the packet is sent.
1. data
2. header
3. address
4. mode
12. In broadcast networks, if two or more packets are sent at the same time, they
1. merge
2. divide
3. multiply
4. collide
13. Packet collision results in
1. data loss
2. data gain
3. nothing
4. none
14. Sending packets to all the computers in a network is called
1. multicasting
2. broadcasting
3. telecasting
4. typecasting
15. LAN means
1. large area network
2. local area network
3. local area number
4. none
16. MAN means
1. metropolitan area network
2. mapping area network
3. metropolitan access network
4. none
17. An LAN, transmission time is
1. not known
2. unbounded
3. bounded
4. none
18. In LAN, data transfer rate lies between
1. 0-5Mbps
2. 5-10Mbps
3. 10-100Mbps
4. 100-1Mbps
19. The LAN standard is known as
1. methylnet
2. ethylnet
3. none
4. Ethernet
20. The LAN standard is also known as
1. IEEE 802.3
2. IEEE 802.5
3. IEEE 802.6
4. 802.11
21. The ________ layer is the layer closest to the transmission medium
1. physical
2. data link
3. network
4. transport
22. A request message always contains
1. a header
2. a status line
3. a status line and a header
4. a request line
23 The header supplies information about the body of a document
1. general
2. request
3. response
4. entity
24. ___________ encoding has a transmission at the beginning of each 0 bit.
1. RZ
2. Manchester
3. differential
4. all the above
25. PCM is an example of ___________ conversion.
1. Digital to digital
2. digital to analog
3. analog to analog
4. analog to digital
26. If the bits rate for an ASK signal is 1200 bps, the baund rate is
1. 300
2. 4000
3. 600
4. 1200
27. If FCC regulation are followed,____potential FM stations are theoretically possible in a given area
1. 50
2. 100
3. 150
4. 133
28. Gaurd bands increase the bandwidth for
1. FDM
2. TDM
3. Both
4. none
29. Which of the following is a time division switch?
1. TSI
2. TDM bus
3. crosspoint
4. none
30. Data from a computer are_____; the local loop handles_________ signals
1. digital; analog
2. digital; analog
3. analog; digital
4. none
31. A traditional telephone line has a bandwidth of_________
1. 2000Hz
2. 2000MHz
3. 4000Hz
4. 4000MHz
32. ARQ stands for
1. automatic repeat quantization
2. automatic repeat request
3. acknowledge repeat request
4. automatic retransmission request
33. The HDLC _________ field defines the beginning and end of a frame
1. flag
2. address
3. control
4. FCS
34. When data and acknowledgement are sent on the same frame, this is called?
1. piggybacking
2. backpacking
3. piggypacking
4. none
35. In the ________ random access method there is no collision.
1. ALOHA
2. CSMA/CD
3. CSMA/CA
4. all the above
36. _________ is (are) a canalization protocol
1. FDMA
2. TDMA
3. CDMA
4. All the above
37. When a primary device asks a secondary device if it has data?
1. polling
2. selecting
3. reserving
4. backing off
38. ________ is a dynamic mapping protocol in which a physical address is found for a given IP address
1. ARP
2. RARP
3. ICMP
4. none
39. An ARP reply is _________ to______
1. broadcast; all hosts
2. multicast; one host
3. unicast; all host
4. unicast; one host
40. An ARP request is _________ to______
1. broadcast; all hosts
2. multicast; one host
3. unicast; all host
4. unicast; one host
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