IT Operations Flashcards
OSI model
All communication over a network expressed in 7 layers. Top 5 handled by OS, bottom two by network.
Client server architecture
Client computers rely on services or data provided by a server.
TCP
Transport layer of OSI. Guaranteeing data is received in the correct order.
IP
Protocol used at network layer of OSI. Finding best path, sending messages in packets and reassembled when received.
DNS
Domain name service. Resolves names into IP addresses that networks can understand.
Mainframe
Large scale server that supported multiple computers simultaneously. Parts are redundant and hot swappable.
Domain controller
Server that controls user account info, authenticates and enforces security and access control.
Active directory
Microsoft database that let’s admin control user access to network resources. Contains Users, groups, computers.
Infrastructure as a service
Hosts hardware remotely for cloud computing.
Platform as a service
Hosts hardware and OS remotely for cloud computing.
Software as a service
Software delivery method where hardware and software are stored remotely.
Virtualization
One physical machine hosts multiple activates usually implemented on one machine.
Terminal services
Apps or desktop are made available to user from a remote server. Processing takes place at the server.
SQL
Structured query language. Used to manage data and databases.
Wep
Wired equivalent privacy. Key is static, easy to break.
Wpa
Wifi protected access. Changes key but compatible with wep therefore not secure.
Wpa2
Uses aes encryption, most secure and standard.
Nat
Network address translation. Device that substitutes it’s address for the address of the computers behind the firewall.
Port forwarding.
Communication from outside network is allowed only to a certain port, and address inside the network.
Thick/fat client
App is installed on client computer. Accesses server for resources but most processing is done on client PC.
Thin client
App not installed on client. Browser is usually point of access.
Interface engine
Acts as a filter between info systems preventing unauthorized transfer of data.
Daily backup
Only files that have changed are backed up, files not marked with archive flag.
Differential backup
New and changed files, does not mark archive flag.
Incremental backup.
Files that have been created or changed since last incremental backup. Does change archive flag.
Archive flag
Tells whether or not a file has been backed up.
Disk image
OS, apps, configuration stored so that it can be applied to another PC.
T-lines
Data transmission tech over fiber. T1 up to 1.544mbps T3 up to 45mbps
