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Computer Networks - II

本测验旨在帮助学习者掌握斯洛伐克语的基础词汇，包括数字、问候语和常用表达，同时了解斯洛伐克的地理位置及文化背景。

25 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

All 32 bits are 0’s, so an IP address

  1. is used by diskless machines
  2. is class A type address
  3. can be only source address
  4. all of the above
Question 2 Multiple Choice (Single Answer)

Find the odd one out.

  1. Data link
  2. Transport
  3. Network
  4. None
Question 3 Multiple Choice (Single Answer)

Monitor

  1. generates token
  2. takes care orphan frames
  3. checks breaks in ring
  4. all of the above
Question 4 Multiple Choice (Single Answer)

Maximum efficiency of pure ALOHA is

  1. 0.18
  2. 0.36
  3. 1
  4. None
Question 5 Multiple Choice (Single Answer)

Stop-and-Wait is not efficient on optical fiber lines as

  1. propagation delay is very less
  2. propagation delay is very large
  3. data rate is very high
  4. both 1 and 3
Question 6 Multiple Choice (Single Answer)

The maximum size for an IPV6 datagram is ____ bytes.

  1. 65535
  2. 65575
  3. 232
  4. 232 + 40
Question 7 Multiple Choice (Single Answer)

E1 carrier data rate is

  1. 1.544 Mbps
  2. 2.048 Mbps
  3. 6.468 Mbps
  4. None
Question 8 Multiple Choice (Single Answer)

For the analog frequency with signal to noise ratio snr = 20db, calculate the theoretical maximum bit rate.

  1. 2000
  2. 10000
  3. 13400
  4. None
Question 9 Multiple Choice (Single Answer)

The light accepting capability of an optical fiber is measured in

  1. reflectance
  2. refraction IFOV
  3. numerical aperture
  4. none of these
Question 10 Multiple Choice (Single Answer)

A packet from an Ethernet requires a _____ before it can be routed to an FDDI network.

  1. repeater
  2. bridge
  3. router
  4. gateway
Question 11 Multiple Choice (Single Answer)

Which option below about digital encoding could be a potential problem?

  1. Encode makes 0 as low signal and 1 as high signal.
  2. Encode is to modulate electromagnetic waves.
  3. Signals propagate over a physical medium.
  4. Low signal (0) may be interpreted as no signal.
Question 12 Multiple Choice (Single Answer)

A configuration of N LANs is linearly connected by 4 bridges. By the time we reach the Nth LAN, how many discovery frames will be circulating?

  1. N4
  2. 4
  3. 4N
  4. N
Question 13 Multiple Choice (Single Answer)

The number of connections needed for N computer in direct point to point communication is equal to

  1. (N2 - N)/2
  2. N (N - 1)
  3. N2
  4. None of the above
Question 14 Multiple Choice (Single Answer)

When the hop count field reaches zero and the destination has not been reached, a _____ error message is sent.

  1. destination unreachable
  2. time exceeded
  3. parameter problem
  4. packet too-big
Question 15 Multiple Choice (Single Answer)

A 16 levels extended QPSK modem uses a 2400 hz carrier(W) on the telephony network. The bit rate is

  1. 20 Kbps
  2. 19.2 Kbps
  3. 1 Mbps
  4. None
Question 16 Multiple Choice (Single Answer)

Entire message cannot be sent as a single communication data unit as

  1. one may monopolize channel
  2. utilisation may become poor
  3. buffer requirements increases
  4. all of the above
Question 17 Multiple Choice (Single Answer)

Packetisation of messages

  1. is an encryption mechanism that enforces network security
  2. helps prevent a single sender from monopolizing a shared communication link for an arbitrary amount of time
  3. is an algorithm for data encoding in the physical layer
  4. none of these
Question 18 Multiple Choice (Single Answer)

Which of the following is a necessary part of IPV6 datagram?

  1. Base header
  2. Extension header
  3. Data packet from the upper layer
  4. Both 1 and 3
Question 19 Multiple Choice (Single Answer)

Unguided media is

  1. Coaxial cable
  2. Twisted pair
  3. Fiber
  4. Microwave
Question 20 Multiple Choice (Single Answer)

What destination address can be used to send a packet from a host with IP address 189.1.1.2 to all hosts on the same network?

  1. 189.0.0.0
  2. 189.255.255.255
  3. 255.255.255.255
  4. None
Question 21 Multiple Choice (Single Answer)

Which of the following is a form of addressing; in which a set of computers is assigned one address?

  1. Broadcast
  2. Multicast
  3. Packet Switch
  4. CRC
Question 22 Multiple Choice (Single Answer)

In X.25, packet transferred across DTE/DCE interface begins with a __ header.

  1. 26 bytes
  2. 3 bytes
  3. 4 bytes IP address
  4. None
Question 23 Multiple Choice (Single Answer)

Find the odd one out.

  1. IBM mainframe
  2. Apple Macintosh (Motorla based)
  3. Sun sparc
  4. IBM PC
Question 24 Multiple Choice (Single Answer)

The Internet is large and heterogeneous. However, it has a few invariables that define its architecture, such as

  1. the used hardware platform
  2. the used addressing scheme
  3. the used physical layer protocol
  4. none of these
Question 25 Multiple Choice (Single Answer)

Token ring supports __ data rates.

  1. 4 Mbps
  2. 16 Mbps
  3. Both 2 and 3
  4. None of these
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