networks

A device is sending out data at the rate of 2000bps. How long does it take to send out (a) 100 bits, (b) a single character (c) a file of 100,000 characters?

• a.    0.05 sec

  b.    0.004 sec

  c.    400 sec

• a.    0.005 sec

  b.    0.004 sec

  c.    400 sec

• a.    0.005 sec

  b.    0.04 sec

  c.    400 sec

• a.    0.05 sec

  b.    0.004 sec

  c.    40 sec

Answer explanation

how long does it take to send out 100 bits?

100/2000 = 0.05 sec

How long does it takes to send out a single character of 8 bits?

8/2000 = 0.004 sec

How long does it take to send a file of 100000 characters? As, single character is of 8 bits.So,{8*100000}/2000 = 400 sec

List the layers of the Internet model (TCP/IP model).

Answer explanation

Application Layer,

Transport Layer,

Network Layer,

Network Interface Layer, and Hardware

Identify which is not the function of Data link layer in model OSI model.

• Framing & Link access

• Error detection

• Error correction

• Reliable delivery

• Routing

Answer explanation

Routing

Data in network layer will be in the form of

• bits

• bytes

• packets

• layer

Answer explanation

packets

In a Wide Area Network (WAN) Inter-processor distance is

• 100 kM to 10,000 kM

• 10M to 1 kM

• 1 m to 10 m

Answer explanation

100 kM to 10,000 kM

Twisting in a twisted-pair help reduce the __________.

• length

• cost

• noise

• None of the choices are correct

Routing tables of a router keeps track of ......

• MAC address of assignments

• Port assignment to network devices

• Distribute IP addresses to network devices

• Routes to use for forwarding data to its destination

In a fully-connected mesh network with 10 computers, total ______ number of cables are required and ______ number of ports are required for each device.

• 40,9

• 45,10

• 45,9

• 50,10

Answer explanation

Since each two host need a cable so n(n-1)/2 cables needed and n – 1 number of ports are required.

i.e. 10(10 – 1) / 2 = 5 * 9 = 45 cables.

9 number of ports are required for each device.

……………… means sending a digital signal over a channel without changing the digital signal to an analog signal.

• Baseband transmission

• Broadband transmission

• Digital transmission

• Analog transmission

Answer explanation

Baseband transmission

A digitized voice channel, is made by digitizing a 4 KHz bandwidth analog voice signal. We need to sample the signal at twice the highest frequency (two samples per hertz) Example at twice the highest frequency (two samples per hertz). We assume that each sample requires 8 bits. What is the required bit rate?

• 6.4kbps

• 3.2kbps

• 64kbps

• 6400bps

Answer explanation

64kbps