How many digits of the DNIC (Data Network Identification Code) identify the country?
A. first three (correct)
B. first four
C. first five
D. first six
E. None of the above
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(correct)
B. flooding
C. static routing
D. delta routing
E. None of the above
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 (correct)
C. 0.991
D. 0.999
E. None of the above
Frames from one LAN can be transmitted to another LAN via the device
A. Router
B. Bridge (correct)
C. Repeater
D. Modem
Which of the following condition is used to transmit two packets over a medium at the same time?
A. Contention
B. Collision (correct)
C. Synchronous
D. Asynchronous
E. None of the above
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 (correct)
E. 255.255.255.255
What are the most commonly used transmission speeds in BPS used in data communication?
A. 300
B. 1200
C. 2400
D. 9600 (correct)
E. None of the above
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(correct)
E. None of the above
Which of the following is used for modulation and demodulation?
A. modem (correct)
B. protocols
C. gateway
D. multiplexer
E. None of the above
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 (correct)
The Internet Control Message Protocol (ICMP)
A. allows gateways to send error a control messages to other gateways or hosts
B. provides communication between the Internet Protocol Software on one machine and
the Internet Protocol Software on another
C. reports error conditions to the original source, the source must relate errors to
individual application programs and take action to correct the problem
D. All of the above (correct)
E. None of the above
Your company has a LAN in its downtown office and has now set up a LAN in the manufacturing
plant in the suburbs. To enable everyone to share data and resources between the two LANs,
what type of device(s) are needed to connect them? Choose the most correct answer.
A. Modem
B. Cable
C. Hub
D. Router (correct)
How many hosts are attached to each of the local area networks at your site?
A. 128
B. 254 (correct)
C. 256
D. 64
E. None of the above
Which of the following technique is used for fragment?
A. a technique used in best-effort delivery systems to avoid endlessly looping packets
B. a technique used by protocols in which a lower level protocol accepts a message from a
higher level protocol and places it in the data portion of the low level frame
C. one of the pieces that results when an IP gateway divides an IP datagram into smaller
pieces for transmission across a network that cannot handle the original datagram size (correct)
D. All of the above
E. None of the above
COMPUTER NETWORK KNOWLEDGE
No comments:
Post a Comment