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Computer Networks

GATE Computer Networks - covers OSI model, protocols, IP addressing, network topologies, error detection, and network performance

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is not a function of data link layer?

  1. Flow control
  2. Error control
  3. Congestion control
  4. Framing
  5. Provides services to the network layer
Question 2 Multiple Choice (Single Answer)

What is the length of burst error if the sender sent 10100011 and corresponding receiver received 10111001?

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
Question 3 Multiple Choice (Single Answer)

Public key encryption makes use of which of the following?

  1. One key
  2. Two keys
  3. Hash function
  4. Digital signature
  5. No key
Question 4 Multiple Choice (Single Answer)

A Go-Back-N ARQ uses a window of size 7. How many bits are needed to define the sequence number?

  1. 3
  2. 7
  3. 8
  4. 4
  5. 14
Question 5 Multiple Choice (Single Answer)

Which of the following is an end to end layer?

  1. Data link layer
  2. Transport layer
  3. Session layer
  4. Network layer
  5. Physical layer
Question 6 Multiple Choice (Single Answer)

Which of the following is a class A host address?

  1. 130.215.8.145
  2. 198.70.51.10
  3. 130.215
  4. 128.10.3.8
  5. 36.56.0.10
Question 7 Multiple Choice (Single Answer)

Which of the following describes the drawback of leaky bucket algorithm solved in token bucket algorithm?

  1. Regulated packet flow
  2. Traffic shaping
  3. Congestion control
  4. Discards packets when the bucket fills up
  5. Rigid output pattern
Question 8 Multiple Choice (Single Answer)

Which of the following protocols is used to map the internet addresses to physical addresses at the network layer?

  1. ARP
  2. Reverse ARP
  3. DHCP
  4. ICMP
  5. Gateway
Question 9 Multiple Choice (Single Answer)

A certain population of ALOHA users manages to generate 100 request/sec. If the time slotted in units of 20 msec, find the channel load.

  1. 2.25
  2. 2
  3. 1.75
  4. 0.2
  5. 1.25
Question 10 Multiple Choice (Single Answer)

Given IP address 128.8.129.43 and the subnet mask 255.255.31.0. What is the subnet address?

  1. 128.8.129.0
  2. 128.8.1.0
  3. 128.0.0.0
  4. 128.8.1.1
  5. 128.8.55.0
Question 11 Multiple Choice (Single Answer)

What is the latency for a 5 MB message, if a bandwidth of the network is 1 Mbps. Assume that the distance between the sender and the receiver is 12,000 km and the light travels at 2.4 X 108 m/sec.

  1. 40.05 sec
  2. 42 sec
  3. 39.95 sec
  4. 41 sec
  5. 40 sec
Question 12 Multiple Choice (Single Answer)

File transfer protocol(ftp) uses which port number for data transfer?

  1. 25
  2. 110
  3. 20
  4. 21
  5. 23
Question 13 Multiple Choice (Single Answer)

If there are n devices (nodes) in a network,what is the number of cable links required for a mesh and a star topology respectively.

  1. n - 1, n (n - 1)/2
  2. n, n - 1
  3. n - 1, n
  4. n (n - 1)/2, n - 1
  5. n, n + 1
Question 14 Multiple Choice (Single Answer)

Which of the following is an application layer protocol?

  1. ICMP
  2. UDP
  3. IP
  4. TCP
  5. TELNET
Question 15 Multiple Choice (Single Answer)

Error Detection at Data link layer is achieved by

  1. Character Stuffing
  2. Bit Stuffing
  3. Encoding
  4. Cyclic Redundancy Check
  5. Character Count
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