15. Give the key elements of protocol.
• Syntax: refers to the structure or format of the data, meaning the order in which they are presented.
• Semantics: refers to the meaning of each section of bits.
1. Timing: refers to two characteristics.
2. When data should be sent and
3. How fast they can be sent.
16. Define line configuration and give its types.
- Line configuration refers to the way two or more
communication devices attach to a link.
- There are two possible line configurations:
i. Point to point and
ii. Multipoint.
17. Define topology and mention the types of topologies.
Topology defines the physical or logical arrangement of links in a network
Types of topology :
- Mesh
- Star
- Tree
- Bus
- Ring
18. Define Hub.
In a star topology, each device has a dedicated point to point link only to a central controller usually called a hub.
19. Give an advantage for each type of network topology.
1. Mesh topology:
* Use of dedicated links guarantees that each connection can carry its own data load, thus eliminating traffic problems.
* Robust and privacy / security.
2. Star topology:
* Less expensive than mesh.
* Needs only one link and one input and output port to connect it any number of others.
* Robustness.
3. Tree topology:
* same as those of a star.
4. Bus topology:
* Ease of installation.
* Uses less cabling than mesh, star or tree topologies.
5. Ring topology:
* A ring is relatively easy to install and reconfigure.
* Each device is linked only to its immediate neighbors.
• Fault isolation is simplified.
20. Define transmission mode and its types.
Transmission mode defines the direction of signal flow between two linked devices.
Transmission modes are of three types.
- Simplex
- Half duplex
- Full duplex.
• Syntax: refers to the structure or format of the data, meaning the order in which they are presented.
• Semantics: refers to the meaning of each section of bits.
1. Timing: refers to two characteristics.
2. When data should be sent and
3. How fast they can be sent.
16. Define line configuration and give its types.
- Line configuration refers to the way two or more
communication devices attach to a link.
- There are two possible line configurations:
i. Point to point and
ii. Multipoint.
17. Define topology and mention the types of topologies.
Topology defines the physical or logical arrangement of links in a network
Types of topology :
- Mesh
- Star
- Tree
- Bus
- Ring
18. Define Hub.
In a star topology, each device has a dedicated point to point link only to a central controller usually called a hub.
19. Give an advantage for each type of network topology.
1. Mesh topology:
* Use of dedicated links guarantees that each connection can carry its own data load, thus eliminating traffic problems.
* Robust and privacy / security.
2. Star topology:
* Less expensive than mesh.
* Needs only one link and one input and output port to connect it any number of others.
* Robustness.
3. Tree topology:
* same as those of a star.
4. Bus topology:
* Ease of installation.
* Uses less cabling than mesh, star or tree topologies.
5. Ring topology:
* A ring is relatively easy to install and reconfigure.
* Each device is linked only to its immediate neighbors.
• Fault isolation is simplified.
20. Define transmission mode and its types.
Transmission mode defines the direction of signal flow between two linked devices.
Transmission modes are of three types.
- Simplex
- Half duplex
- Full duplex.
