Chapter 15 - Data Networks

Question 1

What type of criteria can be used to classify video services?

Answer 1

• The number of stations simultaneously receiving the same video content from the sending device, which can be one
• The direction of transfer of the video content, which can be one-way (unidirectional) or two-way (bi-directional)

Using this criteria four types of network video communications can be identified

• Point-to-point (PTP) unidirectional
• PTP bidirectional
• Point-to-multipoint unidirectional
• Point-to-multipoint bidirectional

Question 2

What is a switch?

Answer 2

A switch is a network access device that provides a centralized point for LAN communications, media connections, and management activities.

Question 3

What is a router?

Answer 3

A router is used to interconnect various types of LANs at Layer 3 of the OSI model. Routers make it possible to segment an organizational network into multiple broadcast domains, also referred to as subnetworks or subnets.

Question 4

When designing a network, the ____ design process is also referred to as bottom-up design.

Answer 4

Physical Design

Question 5

When designing a network, the _____ design process is also referred to as a top-down design.

Answer 5

Functional Design

Question 6

What are the seven Open Systems Interconnection (OSI) layers?

Answer 6

Layer 7: Application Services [How applications on different systems can use the same network]
Layer 6: Presentation Services [Responsible for data conversion, decryption to read data]
Layer 5: Session Services [Responsible for connection between machines/network devices during transfer]
Layer 4: Transport Services [Responsible for ensuring and monitoring quality of data transfer]
Layer 3: Network Services [Responsible for delivering data packages to their ip address]
Layer 2: Data Link Services [Responsible for transfer of data packets]
Layer 1 : Physical Services [Responsible for transfer of raw data]