LAN Switching and Wireless-1

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