Computer Science - 4CP0 PearsonEdexcel

Networks

Gbogbo ọrọ náà

Almost nothing a computer does today happens in isolation. A phone checking the weather, a laptop backing up to the cloud, a till in a shop confirming a card payment: every one of these is a conversation between machines, carried out over a network according to rules both sides agree to follow. This lesson opens up how that conversation actually works.

You will compare network types and usage models, wired versus wireless connections, and how speed is measured, before going layer by layer through the protocols that get a message from one device to another: physical topologies, the four-layer TCP/IP model, packet switching, and the specific protocols behind the web, file transfer and email.

Ebumnobi

Understand why computers are connected in a network
Understand the different types of networks (local area network (LAN), wide area network (WAN), personal area network (PAN)) and usage models (client-server, peer-to-peer)
Understand wired and wireless connectivity
Understand that network data speeds are measured in bits per second (Mbps, Gbps)
Understand the role of and need for network protocols (Ethernet, Wi-Fi, TCP/IP, HTTP, HTTPS, FTP, email (POP3, SMTP, IMAP))
Understand that data can be transmitted in packets using layered protocol stacks and the 4-layer TCP/IP model (application, transport, network, data link)
Understand characteristics of network topologies (bus, ring, star, mesh)
Understand the different mobile communication standards (3G, 4G and subsequent generations)

Akọmọ Ojú-ẹkọ

A network is two or more devices connected together so they can communicate and share resources. Computers are networked for three overlapping reasons: to share hardware such as printers and storage, so an organisation buys fewer devices; to share data so people do not need to carry files between machines on removable media; and to communicate, from email to video calls to multiplayer games. A standalone computer can do none of this; the moment it needs another device's help, it needs a network.

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Ọ dị na Android, Windows, macOS, na Linux

Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Networks. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

Which type of network connects a person's own nearby devices, such as a phone and a pair of wireless earbuds? A) LAN B) WAN C) PAN D) VPN Answer: C
Which network topology connects every device individually to a central switch? A) Bus B) Ring C) Star D) Mesh Answer: C
Which protocol is used to send an email from a client to a mail server? A) FTP B) SMTP C) HTTP D) IMAP Answer: B
In the TCP/IP model, which layer is responsible for adding source and destination IP addresses to data? A) Application B) Transport C) Network D) Data link Answer: C
Network data transfer speeds are typically measured in: A) Bytes per second B) Bits per second C) Hertz D) Packets per second Answer: B