Communication
34 questions· page 1 of 4
Explain the reasons why a video is compressed before it is transmitted using real-time bit streaming.
Identify whether the lossy or lossless compression method is more appropriate for real-time bit streaming. Justify your answer.
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The video conference is accessed over the internet.
Complete the table by stating how modems and dedicated lines are used when data is transmitted over the internet.
| Hardware | Use |
|---|---|
| modems | |
| dedicated lines |
State two ways that a WAN is different to a LAN (Local Area Network).
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The smartphones use the cell phone network to connect to the WAN.
Explain how data is transmitted using the cell phone network.
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Devices that connect to the WAN have an IP address.
Complete the following description of IP addresses by writing the missing words.
IPv4 is displayed as four groups of 8-bit numbers separated by ........................................ .
Each IPv4 address is 32 bits.
IPv6 is made of eight groups of 4 ........................................ numbers separated by colons.
Multiple consecutive groups of ........................................ can be replaced with a double colon.
Each IPv6 address is ........................................ bits.
A ........................................ IP address can change each time the computer connects to a network.
A ........................................ IP address can only be accessed by other devices in the same LAN and is assigned by the router within the LAN.
The main office for the company has four wired computers, one server, two printers, one central switch and a device providing a single point of access for the internet. The network is set up as a star topology.
Draw the topology for the main office network. Label all devices.
Describe the role of a switch in a network.
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The business is deciding which topology to use.
Tick (✓) one or more boxes in each row to identify the topology, or topologies, each statement describes.
| Statement | Bus | Star | Mesh |
|---|---|---|---|
| all devices connect to one central device | |||
| all devices connect to a central cable | |||
| multiple paths for the packets to travel along | |||
| robust against damage because if any line fails, the rest of the network retains full functionality | |||
| most likely to lose data through collisions |
State why the router has a public IP address.
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One difference between an IPv4 and IPv6 address is that the numbers in an IPv4 address are separated by full stops and in an IPv6 address they are separated by colons.
Identify two other differences between an IPv4 and IPv6 address.
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Describe the benefits to the company of using private cloud storage instead of public cloud storage.
Part of the internal structure of the wired LAN is a star topology.
Explain how packets are transmitted between two devices in a star topology.
A collision is detected.
Describe how the collision is managed using Carrier Sense Multiple Access/Collision Detection (CSMA/CD).
Identify two drawbacks of using CSMA/CD.
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The devices in the office have static private IP addresses.
State what is meant by a static private IP address.
Copper cable can be used to transmit data in a network.
Complete the table by identifying and describing two other transmission media that can be used to transfer data in the WAN.
| Transmission medium | Description |
|---|---|
The computer on the LAN is used for real-time video conferences, where people connected to the internet communicate in real-time using video and audio.
Explain how bit streaming is used in a real-time video conference.
State the purpose of a public IP address and a private IP address.
Public IP address ..............................................................................................................
Private IP address .............................................................................................................
Give two benefits of connecting computers to a LAN.
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Give two characteristics of a LAN.
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One of the company’s offices has one server and four computers connected in a star topology.
Draw a diagram to show the layout of the office’s star topology.
Computers can be connected using Ethernet.
Describe what is meant by Ethernet.
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The network runs as a thick-client model.
Describe what is meant by a thick-client model.
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Identify two differences between a WAN and a LAN (local area network).
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Describe what is meant by a mesh topology.
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Give two advantages of using a mesh topology instead of a bus topology.
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The computers in one room are set up as thin-clients in a client-server model.
Describe the role of the different computers in this model.
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Students can connect their devices to the university network using cables or a wireless connection.
Explain the benefits to the students of allowing them to use both wired and wireless connections.
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One site has split the network into several subnetworks.
An IP address in a subnetwork is divided into two parts.
Identify and describe the two parts of an IP address in a subnetwork.
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The LAN connects to the internet using a router.
Describe the function of a router in a network.
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Complete the following table by writing the purpose of each of these other hardware devices used to support the LAN.
| Hardware device | Purpose |
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| switch | |
| Wireless Access Point (WAP) | |
| bridge |
The students can save their school files on a public cloud.
Identify two drawbacks of the students storing their files on the public cloud.
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A new classroom is being set up with 20 computers and a switch.
Explain one advantage of implementing a star topology instead of a bus topology in the new classroom.
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Subnetting can be used to separate a network into logical segments.
Describe two other reasons why subnetting is used in a network.
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State three tasks performed by devices to deal with collisions when using the Carrier Sense Multiple Access /Collision Detection (CSMA/CD) protocol in a network.
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The following incomplete table contains types of IP addresses and their descriptions.
Complete the table by writing the missing types of IP addresses and the missing descriptions.
| Type of IP address | Description |
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| an IP address that is assigned to a device to allow direct access on the internet | |
| static IP address | |
| an IP address used for internal LAN communication only | |
| dynamic IP address |
The following incomplete table contains four network devices and their descriptions.
Complete the table by writing the missing devices and missing descriptions.
| Device | Description |
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| .......................... | Receives and sends data between two networks operating on the same protocol |
| Wireless Network Interface Card (WNIC) | ................................................................................................................. ................................................................................................................. ................................................................................................................. |
| .......................... | Restores the digital signal so it can be transmitted over greater distances |
| Wireless Access Point (WAP) | ................................................................................................................. ................................................................................................................. ................................................................................................................. |
Describe three differences between fibre-optic cables and copper cables.
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Ethernet uses Carrier Sense Multiple Access/Collision Detection (CSMA/CD).
Describe CSMA/CD.
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