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Data Comm > Lesson 3 > Flashcards

Lesson 3 Flashcards

1
Q

Is the geometric representation of the relationship of the links and the linking devices in a network.

A

Topology

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2
Q

Defines the physical or the Logical Agreement of Links in a Network.

A

Topology

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3
Q

Linking devices

A

Nodes

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4
Q

Is the way a network is arranged, including the physical or logical description of how links and nodes are set up to relate to each other.

A

Network Topology

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5
Q

Categories of Topology

A

Mesh, Star, Tree, Bus, Ring

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6
Q

Two possible relationships in a network

A

Peer-to-peer, Primary-Secondary

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7
Q

Devices share the link equally

A

Peer-to-peer

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8
Q

One devices controls traffic and the others must transmit through it

A

Primary-secondary

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9
Q

Each device is connected to every other device on the network through a dedicated point-to-point link.

A

Mesh Topology

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10
Q

Number of links of a mesh topology of n devices

A

n(n-1)/2

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11
Q

Each device in the network is connected to a central device called hub

A

Star Topology

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12
Q

There is a main cable and all the devices are connected to this main cable through drop lines.

A

Bus Topology

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13
Q

Device that connects the drop line to the main cable

A

Tap

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14
Q

Each device is connected with the two devices on either side of it

A

Ring Topology

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15
Q

Device that forwards data until the intended device receives it

A

Repeater

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16
Q

Combination of two or more topology

A

Hybrid Topology

17
Q

Is suggestive of how a network is laid out.

A

Topology of a Network

18
Q

It refers to the specific configuration and structure of the connections between the Links and the Nodes.

A

Topology of a Network

19
Q

What to consider when choosing a Topology

A

Relative status of the devices to be linked

20
Q

Advantages of Mesh Topology

A
  1. No data traffic issues as there is a dedicated link between two devices which means the link is only available for those two devices
  2. Mesh topology is reliable and robust as failure of one link doesn’t affect other links and the communication between other devices on the network
  3. Mesh topology is secure because there is a point to point link thus unauthorized access is not possible
  4. Fault detection is easy.
21
Q

Disadvantages of Mesh Topology

A
  1. Amount of wires required to connected each system is tedious and headache
  2. Since each device needs to be connected with other devices, number of I/O ports required must be huge
  3. Scalability issues because a device cannot be connected with large number of devices with a dedicated point to point link.
22
Q

Doesn’t allow direct communication between devices, a device must have to communicate through hub

A

Star topology

23
Q

If one device wants to send data to other device, it has to first send the data to hub and then the hub transmits that data to the designated device.

A

Star topology

24
Q

Advantages of Star Topology

A

Less expensive , Easier to install, less amount of cables , Robust, Easy fault detection

25
Q

Disadvantages of Star Topology

A
  1. If hub goes down everything goes down, none of the devices can work without hub
  2. Hub requires more resources and regular maintenance
26
Q

Connects the drop line to the main cable

A

Tap

27
Q

Advantages of Bus Topology

A

Easy installation, less cable required

28
Q

Disadvantages of Bus Topology

A

Difficulty in fault detection, not scalable

29
Q

If a device wants to send data to another device then it sends the data in one direction, each device in ring topology has a repeater, if the received data is intended for other device then repeater forwards this data until the intended device receives it.

A

Ring Topology

30
Q

There are two dedicated point to point links a device has with the devices on the either side of it

A

Ring topology

31
Q

Advantages of Ring Topology

A

Easy to install, managing is easier

32
Q

Disadvantages of Ring Topology

A
  1. A link failure can fail the entire network as the signal will not travel forward due to failure
  2. Data traffic issues
33
Q

Advantages of Hybrid Topology

A
  1. We can choose the topology based on the requirement for example, scalability is our concern then we can use star topology instead of bus technology.

2.Scalable as we can further connect other computer networks with the existing networks with different topologies.

34
Q

Disadvantages of Hybrid topology

A
  1. Fault detection is difficult.
  2. Installation is difficult.
  3. Design is complex so maintenance is high thus expensive.

Data Comm (16 decks)

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