Chapter 3# Q's

Chapter #3 Questions

COMMUNICATIONS

Q1)  what does the terms data communications mean?: Data communications refers to the transmission of digital data between two or more computers

Q2) identify the devices you use on a day-to-day basis that connect to a network: Laptop, Desktop, Mobile phone.

NETWORKS
Q3) Provide an example of a sending device and a receiving device: SENDING: Phone, Desktop, Modem. RECEIVING DEVICE: Printer, Router, Phone, and Switch.

Q4) what is a network? How is a local area network (LAN) different from a wide area network (WAN)?: A network consists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications. LAN covers a small geographic area, it has a higher data transfer rate.

Q5) How does a peer-to-peer network differ from a client-server network?:

Peer-to-Peer Networks	Client/Server Networks
Each PC is an equal participant on the network	One PC acts as the network controller
PCs are not reliant on one PC for resources such as the printer	One PC controls access to network resources

Q7) Describe the type of network a business might use if they have a head office in one city and wish to enable other branches and travelling salespeople to maintain regular contact and access data and files stored on their central servers: The ‘Business’ would use a WAN network, because it will be able to cover a large amount of area and the salespeople can accesses data from any place at any time.

Q8) What security risks can occur if a user shares files on an internet P2P network?: For files to be shared on a P2P network, a specific TCP port must be opened. Allowing internet peer-to-peer file sharing expose your computer. The computer would be exposed to malicious software.

Q9) describe the benefits in downloading a file from a P2P network using torrents rather than from a single source: P2p is more efficient, P2p files can take large files and make them more manageable, and allowing for faster downloads

Q10) What do the terms ‘Peer’,’Seed’ and ‘Leech’ refer to when referring to torrent downloads?:

Seed: Seeders are people who have already downloaded the file and are uploading them. The more seeders the faster the download will go.

 Leech: Leechers are people who are sharing what they have and are downloading what you have. When searching torrents, always get high seeded torrents.

Q11) what is an intranet? What benefits to organisations are there in setting up an intranet?: An Intranet is a private network accessible only to an organisation’s staff.

Q12)Describe the advantages or setting up a home network: Multiple users can simultaneously interact with each other and share resources.

A home network can have as many wireless devices like laptops and mobile phones can connect to it, that’s if it has a wireless router.

Easy to create

Q13) There are four types of home network in common use. Which type would you choose to set up a network in your home? Why would you choose that type?: LAN would be the most viable option, because of its small area of coverage and high transfer speed would be mostly suitable a house hold.

COMMUNICATIONS DEVICES

Q14) Routers and switches are used to connect separate networks. Explain the circumstances in which each of these would be used: Routers: is a networking device that forwards data packets between computer networks, so the ‘Router’ would take part in downloading any software and receiving message via social media.

Switch: The network switch plays an integral role in most modern Ethernet local area networks (LANs). Mid-to-large sized LANs contain a number of linked managed switches. Small office/home office (SOHO) applications typically use a single switch, or an all-purpose converged such as a residential gateway to access small office/home broadband services such as DSL or cable Internet

Q15) What is the function of a wireless broadband router in a home network?: A basic router that connects a LAN network to the internet, also functioning as a switch, a firewall and a wireless access point.

Q16) Identify the components that need to be installed in a home or business to enable LAN to connect to the NBN connection box?: It is required for the user to have a FTTP router to connect to an NBN.

Q17) What is the intended purpose of two voice ports on the NBN connection box?: The two voice ports are used to connect to telephones and cordless base station.

Q18) What is the purpose of a network interface card? What do mobile computers use in place of a network interface card?: A Network interface card, NIC, or Network card is an electronic device that connects a computer to a computer network, usually a LAN.

Q19) A wireless access point can be wired to the fibre-optic backbone of a bus network. What is the purpose of the wireless access point?: To allow transmission of data between computers and mobile phones at a distance.

Q20) It may be difficult to pick up a consistent wireless signal in a large home with solid brick walls. Where should the access point be located to provide the strongest signal throughout the house? What solution would you recommend to ensure that some of the more distant parts of the house, such as the back patio, receive a signal?: The WAP should be located In the centre of the house, to equally spread its coverage.

Q21) Many home networks include a smart TV and a network-attached storage device. Describe the functions of these devices: Network-attached storage (NAS) is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS is specialized for serving files either by its hardware, software, or configuration.

Q22) A particular network-attached storage device has a capacity of 8 Terabytes. How many megabytes is this equivalent to?: 8*1024*1024 = 8388608 Mb

SENDING AND RECEIVING DEVICES

Q36) Provide three examples of wearable technology: Smart watch, Go pro(Wearable camera),Virtual reality headset.

COMMUNICATIONS CHANNEL AND TRANSMISSION DATA

Q37) What advantage do fibre optics have over wire cables?: Fibre optic cable advantages:

-Greater transfer data rate

-Is less prone to interference

-Is better at transferring media data.

Q38) In what circumstances would a network designer consider using wireless transmission media?: A network designer would use a wireless transmission device if installing wires or cables is impractical or impossible.

Q39)Briefly describe the broadcast radio and cellular radio wireless transmission media: Broadcast radio: Radio broadcasting is a unidirectional wireless transmission over radio waves intended to reach a wide audience. Stations can be linked in radio networks to broadcast a common radio format, either in broadcast syndication or simulcast or both.

Cellular radio: A cellular network or mobile network is a communication network where the last link is wireless. The network is distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station. This base station provides the cell with the network coverage which can be used for transmission of voice, data and others.

Q40) Describe how near field communication technology allows a user with a smartphone to read information at a museum exhibit:

• Q41: Line-of-sight will be disrupted if any obstacle, such as new buildings, are in the way
• Signal absorption by the atmosphere. Microwaves suffer from attenuation due to atmospheric conditions.
• Towers are expensive to build

Q42) Many companies use satellite transmission to access the internet. Web satellites, however will provide faster downlink transmissions than uplink transmissions. Why is the difference in speed not of major concern to these companies?: