3e Network components and Servers

Gladys Mba
Mind Map by Gladys Mba, updated more than 1 year ago
Gladys Mba
Created by Gladys Mba over 4 years ago
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A level, A2 IT (Chapter 3) Mind Map on 3e Network components and Servers, created by Gladys Mba on 01/19/2017.

Resource summary

3e Network components and Servers
  1. Servers
    1. File servers
      1. Stores users and shared files on a network. Usually a set amount of storage set for each user.
      2. Proxy Servers
        1. Manages internet access
          1. Stores visited webpages in cache for faster access for next visit
            1. Filter access to webpages to block unwanted pages
              1. Firewall to examine data and block undesirable data
            2. Application Servers
              1. Stores software to be used across network
                1. Store software so it can be run from server by client's computer
                  1. Increases network traffic but saves storage, memory and processing on client
                  2. Store installation files to deploy software to client computers.
                    1. Reduces traffic but increases storage and processing needed on client computer
                2. Mail Servers
                  1. Manages all email for an organisation
                    1. Receives all mail and puts each in appropriate inbox
                      1. Only authorised user can view mail
                      2. Virus check and SPAM filter
                        1. Provides central address book
                          1. Sets mailbox size limits
                          2. Sends email through LAN or WAN
                          3. Print Server
                            1. Manages access to printers
                              1. Can restrict access to printers or number of pages to be printed at once
                              2. Send jobs to be processed by printer servers reducing amount of processing by client computer
                                1. Put print jobs into queue and can prioritise jobs
                                  1. Can charge users and provide report on who printed what
                                  2. Back up Server
                                    1. Backs up all data on network so users don't have to.
                                      1. Schedules backup jobs can be done overnight each day
                                    2. Switch
                                      1. Connects several devices together through ports to enable devices to communicate. Devices are connected to serve by cable
                                        1. Data packets are received and analysed by switch and sent to correct destination port
                                          1. Core Switch
                                            1. Several switches connected to a core switch
                                              1. Core switch manages all data packets received by switch and can send data between switched
                                                1. Used in large organisations
                                                2. Bandwidth can be limited or priority given to data on certain ports
                                                  1. Configuring for Quality of service (QoS) to give priority to applications that need guaranteed bandwidth e.g. video conferencing
                                                  2. Can be configured to set up VLAN or monitor traffic
                                                  3. Hubs
                                                    1. Like a switch but doesn't examine data packets
                                                      1. Data packets sent to all ports and filtered individually by each device
                                                        1. More collisions and more susceptible to interception
                                                        2. Wireless Access Point (WAP)
                                                          1. Communicates wirelessly with radio signals
                                                            1. Usually connected to main network through cable to a switch
                                                              1. Recipient devices need to be wirelessly enabled e.g. laptops, mobile phones
                                                                1. Signals from wireless devices received and sent to network or another wireless device
                                                                  1. Easier for hackers to intercept
                                                                    1. WAPs have to use encryption
                                                                  2. Network Interface Card (NIC)
                                                                    1. Enables a computer to be connected to a network using cable
                                                                      1. Usually automatically included on motherboard as part of computer circuitry
                                                                        1. Has a Media Access Control (MAC) address to uniquely identify the device
                                                                          1. Wireless Network Interference Card
                                                                            1. Used by device in order to communicate to WAP
                                                                              1. Can be part of internal circuitry, be in the form of a USB wireless dongle or and adapter card
                                                                            2. Router
                                                                              1. An advanced switch
                                                                                1. Store address of devices
                                                                                  1. Uses headers and tables to send data to device in the most efficient route
                                                                                    1. Acts as a gateway for a network
                                                                                    2. Repeater
                                                                                      1. Repeats signal over regular distance to prevent the signal from deteriorating
                                                                                        1. Used on cables, but can be wireless
                                                                                      2. Gateway (application)
                                                                                        1. The exit of one network and entrance of another - Creates a bridge between two networks
                                                                                          1. Is part of a router, switch or proxy server
                                                                                          2. Used to send data from LAN to WAN
                                                                                          3. Firewall (application)
                                                                                            1. Configured on a computer or network to present unauthorised access to or from a network
                                                                                              1. Can be part of router, proxy sever or PC
                                                                                                1. Examines all data coming in or going out of a network and blocks access to unacceptable traffic
                                                                                                  1. Can use application gateway to allow or deny certain application traffic e.g. email or file transfer
                                                                                                    1. Can be used to only give access to certain users
                                                                                                      1. Prevents hackers, viruses or worms getting access to LAN
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