Communication

Question 1

What are the network hardware components

Answer 1

Switches HubsRouters / wireless routersGatewayBridgeWireless Access PointsNIC card (Network Interface Card)

Question 2

What are switches

Answer 2

analyses each packet of data and sendsit to the computer to which it was intended.

Question 3

What are Hubs

Answer 3

copies all packets of data to all devices onthe network.

Question 4

What are routers

Answer 4

stores computeraddresses on the network and transfers databetween devices

Question 5

What is a gateway

Answer 5

joins together two networks that usedifferent base protocols, e.g. links a LAN to WAN.

Question 6

What is a bridge

Answer 6

joins together two networks that use thesame base protocols, e.g. links LAN to LAN.

Question 7

What are wireless access points

Answer 7

a device that allows otherWi-Fi devices to connect to a network.

Question 8

What are NIC cards

Answer 8

allows devices to access a network. A wireless NIC allows devices to access a network wirelessly

Question 9

What are the types of transmissions

Answer 9

• Wired – 100Mbs – 10GBps (CAT5-6a).* Fibre* FTTC – fibre to cabinet.* FTTP – fibre to premises.* Wireless – radio, microwave, satellite, infrared.

Question 10

What are the Communication technologies

Answer 10

Ethernet – 802.3 – often used in a LAN. Consists ofCAT5-CAT7 cabling.* Bluetooth – short-range wireless technologyexchanging data between devices, e.g. smart phoneand headphones.* WiFi – 802.11 – used in LANs to connect deviceswirelessly.* TCP/IP – a suite of protocols that enables devices tocommunicate over a network.* 2G(GSM) / 2.5G(GPRS) / 3G / 4G / 5G – cellularnetwork that allows electromagnetic waves totransmit data over long distances. Used in WANs.

Question 11

What are the protocols and standards 1

Answer 11

Ethernet – wired (cable connection) protocol.* Wi-Fi – wireless. Two common standards are Bluetooth and 801.11.* TCP (Transmission Control Protocol) – a means of putting datagrams together.* IP (Internet Protocol) – a means of addressing and routing data packets across a network.* UDP (User Datagram Protocol) – a low-cost means of putting datagrams together, principally for streaming, video, etc.

Question 12

What is the protocols and standards 2

Answer 12

• SIP (Session Initiation Protocol) – stateless signalling used for setting up VoIP and media streaming.* HTTP (Hypertext Transfer Protocol) – allows webpages to be shared across differentcomputers and browsers.* HTTPS (a secure variant of HTTP) – it works together with another protocol, Secure Sockets Layer (SSL), to transport data securely.* SMTP (Simple Mail Transfer Protocol) – mail servers use SMTP to send and receive mail. Messages and mail applications typically use SMTP only for sending messages to a mail server.* FTP (File Transfer Protocol) – a means of sending files across the Internet between one or more points.