IT Operations Flashcards

1
Q

OSI model

A

All communication over a network expressed in 7 layers. Top 5 handled by OS, bottom two by network.

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2
Q

Client server architecture

A

Client computers rely on services or data provided by a server.

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3
Q

TCP

A

Transport layer of OSI. Guaranteeing data is received in the correct order.

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4
Q

IP

A

Protocol used at network layer of OSI. Finding best path, sending messages in packets and reassembled when received.

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5
Q

DNS

A

Domain name service. Resolves names into IP addresses that networks can understand.

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6
Q

Mainframe

A

Large scale server that supported multiple computers simultaneously. Parts are redundant and hot swappable.

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7
Q

Domain controller

A

Server that controls user account info, authenticates and enforces security and access control.

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8
Q

Active directory

A

Microsoft database that let’s admin control user access to network resources. Contains Users, groups, computers.

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9
Q

Infrastructure as a service

A

Hosts hardware remotely for cloud computing.

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10
Q

Platform as a service

A

Hosts hardware and OS remotely for cloud computing.

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11
Q

Software as a service

A

Software delivery method where hardware and software are stored remotely.

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12
Q

Virtualization

A

One physical machine hosts multiple activates usually implemented on one machine.

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13
Q

Terminal services

A

Apps or desktop are made available to user from a remote server. Processing takes place at the server.

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14
Q

SQL

A

Structured query language. Used to manage data and databases.

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15
Q

Wep

A

Wired equivalent privacy. Key is static, easy to break.

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16
Q

Wpa

A

Wifi protected access. Changes key but compatible with wep therefore not secure.

17
Q

Wpa2

A

Uses aes encryption, most secure and standard.

18
Q

Nat

A

Network address translation. Device that substitutes it’s address for the address of the computers behind the firewall.

19
Q

Port forwarding.

A

Communication from outside network is allowed only to a certain port, and address inside the network.

20
Q

Thick/fat client

A

App is installed on client computer. Accesses server for resources but most processing is done on client PC.

21
Q

Thin client

A

App not installed on client. Browser is usually point of access.

22
Q

Interface engine

A

Acts as a filter between info systems preventing unauthorized transfer of data.

23
Q

Daily backup

A

Only files that have changed are backed up, files not marked with archive flag.

24
Q

Differential backup

A

New and changed files, does not mark archive flag.

25
Q

Incremental backup.

A

Files that have been created or changed since last incremental backup. Does change archive flag.

26
Q

Archive flag

A

Tells whether or not a file has been backed up.

27
Q

Disk image

A

OS, apps, configuration stored so that it can be applied to another PC.

28
Q

T-lines

A

Data transmission tech over fiber. T1 up to 1.544mbps T3 up to 45mbps