Lesson 3

Question 1

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

Answer 1

Topology

Question 2

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

Answer 2

Topology

Question 3

Linking devices

Answer 3

Nodes

Question 4

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.

Answer 4

Network Topology

Question 5

Categories of Topology

Answer 5

Mesh, Star, Tree, Bus, Ring

Question 6

Two possible relationships in a network

Answer 6

Peer-to-peer, Primary-Secondary

Question 7

Devices share the link equally

Answer 7

Peer-to-peer

Question 8

One devices controls traffic and the others must transmit through it

Answer 8

Primary-secondary

Question 9

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

Answer 9

Mesh Topology

Question 10

Number of links of a mesh topology of n devices

Answer 10

n(n-1)/2

Question 11

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

Answer 11

Star Topology

Question 12

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

Answer 12

Bus Topology

Question 13

Device that connects the drop line to the main cable

Answer 13

Tap

Question 14

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

Answer 14

Ring Topology

Question 15

Device that forwards data until the intended device receives it

Answer 15

Repeater

Question 16

Combination of two or more topology

Answer 16

Hybrid Topology

Question 17

Is suggestive of how a network is laid out.

Answer 17

Topology of a Network

Question 18

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

Answer 18

Topology of a Network

Question 19

What to consider when choosing a Topology

Answer 19

Relative status of the devices to be linked

Question 20

Advantages of Mesh Topology

Answer 20

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.

Question 21

Disadvantages of Mesh Topology

Answer 21

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.

Question 22

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

Answer 22

Star topology

Question 23

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.

Answer 23

Star topology

Question 24

Advantages of Star Topology

Answer 24

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

Question 25

Disadvantages of Star Topology

Answer 25

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

Question 26

Connects the drop line to the main cable

Answer 26

Tap

Question 27

Advantages of Bus Topology

Answer 27

Easy installation, less cable required

Question 28

Disadvantages of Bus Topology

Answer 28

Difficulty in fault detection, not scalable

Question 29

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.

Answer 29

Ring Topology

Question 30

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

Answer 30

Ring topology

Question 31

Advantages of Ring Topology

Answer 31

Easy to install, managing is easier

Question 32

Disadvantages of Ring Topology

Answer 32

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

Question 33

Advantages of Hybrid Topology

Answer 33

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.

Question 34

Disadvantages of Hybrid topology

Answer 34

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