Flashcards in U1T1.1 - Networks Deck (73)
What is a network?
A number of cable/wirelessly linked computers. Can share resources + communicate.
What is a LAN?
Local Area Network. Computer systems close (same building) Can directly physically connect. Normally connected with wire cables, wireless links or fibre optic.
What is a MAN?
Metropolitan Area Network. Covers highly populated area less than 30 miles. Uses fibre optic cable + wireless. Cost effective as users close.
What is a WAN?
Wide Area Network. Computers spread far. Use phone links, fibre optic + satellite. May links LANs in large spread organisation.
What is an NIC?
Network Interface Card. Electronic circuit board in computer to connect to network, wired or wireless if WNIC. Allows communication with file server + other network computers. Provides port to allow network cable to attach to NIC. Has various speeds.
What is a WNIC?
Wireless Network Interface Card. On most laptops to connect to wireless router (using Wi-Fi) to access network.
What is a server?
Computer on network managing resources that can be used by any authorised client station. Manages resources. Only perform their specific server tasks. Files secured by username + password + firewall.
What are 9 different types of server?
File, printer, CD-ROM, database, internet. web, application, terminal services + mail.
What is a switched hub?
Single connection point for comps on network. Allows many computers to connect to it directly with network cables. Checks destination of data packet + ensures it's forwarded to intended comp. Most also support load balancing so data packets transmitted via diff network segments based on traffic patterns.
What is a repeater?
Network device used in transmission of data when signal is distorted due to long distance. Regenerates/boosts digital signals which have been attenuated so can be transmitted longer distances.
What is a WAP?
Wireless Access Point. Wireless computer networking device. Allows Wi-Fi enabled device to connect to router to access network. Wi-Fi hotspots use WAP to support Wi-Fi coverage area. Connect wireless devices to wired network using Wi-Fi/Bluetooth. Creates hotspot.
What is a media converter?
Allows 2 dissimilar media types to connect. Changes physical signals where diff network types link (fibre optic + copper)
What is an IP address?
Internet Protocol Address. Devices which communicate using internet are assigned these unique codes. Consists of 32 bits in 4 octets of nums from 0 - 255 in decimal form. e.g. 220.127.116.11 Static (perm) or dynamic (temp). Provided by ISP. Changes based on location.
What do networks using TCP/IP protocol use to route messages?
IP address of destination.
What is a MAC address?
Media Access Control Address. Allocated to NIC when it's made. Unique to each node, provided by manufacturer. Made of 6 2 digit hexadecimal nums, separated by colons. Automatically recognised by most networks + not required by user. e.g. 0a:1d:8f:b1:c0:8e. Used in filtering process on wireless networks to track users + limit access. May only accept certain MAC addresses.
What does a file server do?
Provides central disk storage for network users. Software identifies each user's files to make them inaccessible to others. Can access files from any client station or with suitable access rights, other users' data.
What does a printer server do?
Allows client stations to use printers controlled by it. Provides facilities of printer spooler.
What does a CD-ROM server do?
Allows all client stations to obtain data from CD-ROM being used by CD-ROM server computer. Has access to many disks from collection of several drivers, CD jukebox or disk images on server.
What does a database server do?
Manages large database. Client stations can access data in it + can maintain it if authorised. Server carries out database processing.. Query sent by client + results assembled by server + returned. Ensures database consistency.
What does an internet server do?
Manages internet access for all network users. Often called proxy server as combines additional safety features of proxy server.
What does a web server do?
Provides internet pages for other comps through internet. Provides cache of web pages stored when first accessed so supplied without accessing internet next time so no delay.
What does an application server do?
Stores app software (word processor program) When needing to use, temporarily copied from server so easy to update software centrally + monitor usage.
What does a terminal services server do?
Stores + runs app software over network for client stations. Software not copied.
What does a mail server do?
Manages email for network. Provides email addresses, stores incoming emails until collected by users + sends outgoing emails to destinations.
What is IP?
Internet Protocol. Standard set of rules to ensure proper info transfer between comps on internet. IPs determine how data is to be structures + control signals used.
What are some types of IPs?
HTTP, SMTP + POP3.
What is HTTP?
HyperText Transfer Protocol. Defines process of identifying, requesting + transferring multimedia web pages over internet. Web pages usually constructed using HTML.
What is SMTP?
Simple Mail Transfer Protocol. Transfer email between comp systems. Incoming mail stored on service provider's comp. Doesn't automatically download mail once user connects to server but requires specific request to do so.
What is POP3?
Post Office Protocol 3. Defines email transfer between comp systems. Provides more facilities than SMTP.