Networking

1.	How many digits of the DNIC (Data Network Identification Code) identify the country?
	A. first three B. first four C. first five D. first six E. None of the above

2.	A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?
	A. hot potato routing B. flooding C. static routing D. delta routing E. None of the above

3.	The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to
	A. 0.003 B. 0.009 C. 0.991 D. 0.999 E. None of the above

4.	Frames from one LAN can be transmitted to another LAN via the device
	A. Router B. Bridge C. Repeater D. Modem

5.	Which of the following condition is used to transmit two packets over a medium at the same time?
	A. Contention B. Collision C. Synchronous D. Asynchronous E. None of the above

6.	You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?
	A. 255.240.0.0 B. 255.248.0.0 C. 255.252.0.0 D. 255.254.0.0 E. 255.255.255.255

7.	What are the most commonly used transmission speeds in BPS used in data communication?
	A. 300 B. 1200 C. 2400 D. 9600 E. None of the above

8.	What is the default subnet mask for a class C network?
	A. 127.0.0.1 B. 255.0.0.0 C. 255.255.0.0 D. 255.255.255.0 E. None of the above

9.	Which of the following is used for modulation and demodulation?
	A. modem B. protocols C. gateway D. multiplexer E. None of the above

10.	Which of the following is not a disadvantage of wireless LAN?
	A. Slower data transmission B. higher error rate C. interference of transmissions from different computers D. All of the above